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taildragon(at)msn.com
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 Posted: Sun Jan 23, 2011 5:43 pm Post subject: Landing gear shake |
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<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]-->
Today I was able to have a guy observe the gear up close as I was landing. I have been feeling a shake during roll out below 30 mph. Sometimes not too much but sometimes significant. Applying brakes seems to make it worse but nothing will make it stop until slowing below 20 mph. Speeds above 30 mph are smooth. He said that the left main was shaking and it looked to be rapidly moving forward and back.
Are others noticing this shaking? Is there a fix or a way to minimize the shaking that anyone has discovered?
Thank you,
Roger Standley
N291RV
165 hours
[quote][b]
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pitts_pilot(at)bellsouth.
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| Posted: Sun Jan 23, 2011 5:59 pm Post subject: Landing gear shake |
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Just a SWAG, but you may have a warped brake disc. Or the brake disk may not be seated perpendicular to the axle. Forward/aft 'walking' is indicative of varying drag ..... or waves in the surface of the runway or ramp.
Let us know what you find.
Linn
On 1/23/2011 8:40 PM, Roger Standley wrote: [quote] <?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]-->
Today I was able to have a guy observe the gear up close as I was landing. I have been feeling a shake during roll out below 30 mph. Sometimes not too much but sometimes significant. Applying brakes seems to make it worse but nothing will make it stop until slowing below 20 mph. Speeds above 30 mph are smooth. He said that the left main was shaking and it looked to be rapidly moving forward and back.
Are others noticing this shaking? Is there a fix or a way to minimize the shaking that anyone has discovered?
Thank you,
Roger Standley
N291RV
165 hours
[b]
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carl.froehlich(at)verizon
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| Posted: Sun Jan 23, 2011 6:15 pm Post subject: Landing gear shake |
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Good discussions on this in the archive.
Standard things to check:
<![if !supportLists]>- <![endif]>Balance all wheels/tire assemblies. I use the stick on weights – available at Matco.
<![if !supportLists]>- <![endif]>Check main gear hub cap for proper load on the wheel bearings. The wheel should spin a turn or so after a good hand push.
<![if !supportLists]>- <![endif]>Check that you don’t have an out of round tire.
<![if !supportLists]>- <![endif]>On the nose gear install the Matco replacement axel if not already done: http://www.matcomfg.com/AXLEASSEMBLYA24125INCH-idv-3657-1.html This enables a fixed preload on the nose bearing that is not affected by axel to fork mounting bolt torque. Note – a nose gear shimmy can induce a main gear vibration.
Carl Froehlich
RV-8A (600 hours)
RV-10 (just finishing cowl and plenum install)
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Roger Standley
Sent: Sunday, January 23, 2011 8:41 PM
To: rv10-list(at)matronics.com
Subject: Landing gear shake
Today I was able to have a guy observe the gear up close as I was landing. I have been feeling a shake during roll out below 30 mph. Sometimes not too much but sometimes significant. Applying brakes seems to make it worse but nothing will make it stop until slowing below 20 mph. Speeds above 30 mph are smooth. He said that the left main was shaking and it looked to be rapidly moving forward and back.
Are others noticing this shaking? Is there a fix or a way to minimize the shaking that anyone has discovered?
Thank you,
Roger Standley
N291RV
165 hours
| Quote: | | http://www.matronics.com/Navigator?RV10-List |
01234567
[quote][b]
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philperry9(at)gmail.com
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| Posted: Sun Jan 23, 2011 6:34 pm Post subject: Landing gear shake |
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I have a static balancer and found that following Van's 'red dot'
plans but the tire/wheel assemblies at the most extreme out of balance
scenario. I eventually had to install the red dot 180 degrees
opposite of Vans plans and still add weight to bring the assembly into
balance.
This was true on both of the mains. I can't speak for Vans nosewheel
because I went with the Matco setup.
Your milage may vary, but this was just waht I found on mine after
balancing them.
On 1/23/11, Carl Froehlich <carl.froehlich(at)verizon.net> wrote:
| Quote: | Good discussions on this in the archive.
Standard things to check:
- Balance all wheels/tire assemblies. I use the stick on weights -
available at Matco.
- Check main gear hub cap for proper load on the wheel bearings.
The wheel should spin a turn or so after a good hand push.
- Check that you don't have an out of round tire.
- On the nose gear install the Matco replacement axel if not
already done:
http://www.matcomfg.com/AXLEASSEMBLYA24125INCH-idv-3657-1.html This enables
a fixed preload on the nose bearing that is not affected by axel to fork
mounting bolt torque. Note - a nose gear shimmy can induce a main gear
vibration.
Carl Froehlich
RV-8A (600 hours)
RV-10 (just finishing cowl and plenum install)
From: owner-rv10-list-server(at)matronics.com
[mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Roger Standley
Sent: Sunday, January 23, 2011 8:41 PM
To: rv10-list(at)matronics.com
Subject: Landing gear shake
Today I was able to have a guy observe the gear up close as I was landing. I
have been feeling a shake during roll out below 30 mph. Sometimes not too
much but sometimes significant. Applying brakes seems to make it worse but
nothing will make it stop until slowing below 20 mph. Speeds above 30 mph
are smooth. He said that the left main was shaking and it looked to be
rapidly moving forward and back.
Are others noticing this shaking? Is there a fix or a way to minimize the
shaking that anyone has discovered?
Thank you,
Roger Standley
N291RV
165 hours
|
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
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philperry9(at)gmail.com
Guest
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| Posted: Sun Jan 23, 2011 6:54 pm Post subject: Landing gear shake |
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but = put
I should proof read before clicking send. 
On 1/23/11, Phillip Perry <philperry9(at)gmail.com> wrote:
| Quote: | I have a static balancer and found that following Van's 'red dot'
plans but the tire/wheel assemblies at the most extreme out of balance
scenario. I eventually had to install the red dot 180 degrees
opposite of Vans plans and still add weight to bring the assembly into
balance.
This was true on both of the mains. I can't speak for Vans nosewheel
because I went with the Matco setup.
Your milage may vary, but this was just waht I found on mine after
balancing them.
On 1/23/11, Carl Froehlich <carl.froehlich(at)verizon.net> wrote:
> Good discussions on this in the archive.
>
> Standard things to check:
>
> - Balance all wheels/tire assemblies. I use the stick on weights
> -
> available at Matco.
>
> - Check main gear hub cap for proper load on the wheel bearings.
> The wheel should spin a turn or so after a good hand push.
>
> - Check that you don't have an out of round tire.
>
> - On the nose gear install the Matco replacement axel if not
> already done:
> http://www.matcomfg.com/AXLEASSEMBLYA24125INCH-idv-3657-1.html This
> enables
> a fixed preload on the nose bearing that is not affected by axel to fork
> mounting bolt torque. Note - a nose gear shimmy can induce a main gear
> vibration.
>
> Carl Froehlich
>
> RV-8A (600 hours)
>
> RV-10 (just finishing cowl and plenum install)
>
> From: owner-rv10-list-server(at)matronics.com
> [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Roger Standley
> Sent: Sunday, January 23, 2011 8:41 PM
> To: rv10-list(at)matronics.com
> Subject: Landing gear shake
>
>
> Today I was able to have a guy observe the gear up close as I was landing.
> I
> have been feeling a shake during roll out below 30 mph. Sometimes not too
> much but sometimes significant. Applying brakes seems to make it worse
> but
> nothing will make it stop until slowing below 20 mph. Speeds above 30 mph
> are smooth. He said that the left main was shaking and it looked to be
> rapidly moving forward and back.
>
> Are others noticing this shaking? Is there a fix or a way to minimize the
> shaking that anyone has discovered?
>
> Thank you,
>
> Roger Standley
>
> N291RV
>
> 165 hours
>
|
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taildragon(at)msn.com
Guest
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| Posted: Mon Jan 24, 2011 6:09 pm Post subject: Landing gear shake |
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<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]--> Thank you for the feedback. I plan to replace the main tires and brake pads soon and will be mindful of the items you all have mentioned. More to follow...
Roger
[quote] ---
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scottmschmidt(at)yahoo.co
Guest
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| Posted: Sat Feb 05, 2011 11:11 pm Post subject: Landing gear shake |
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I have posted on this topic before.
Mine does the exact same at the same speeds as does many other RV-10's.
Sometimes balancing the tire fixes/helps, sometimes different tires, pressures, ect.
I have tried most with no success. I have talked with Van about it and he indicated that his personal plane even did it. I have also heard that when people installed the wheel pants it started. It all comes down to a poor gear design. A round gear leg is not the optimal design for a landing gear but is the cheapest shape from a manufacturing point of view.
It is not the caliper either. Even if I slow down with no braking it occurs. I can replicate it on the ground with one wheel jacked up and use my buffer to get the wheel up to 50 mph and when it slows to around 25 mph, it shakes. It is the system hitting a natural frequency.
Van said people have put a block of wood on the backside of other RV models to stop it.
I spent a considerable amount of time re-drilling my gear legs to get the exact toe-in on both sides and it did not change one thing. I have tried two different sets of tires, pressures from 25-60 psi all with no luck. My next plan, when I get to it, is to install the wheel pant spacers from PlaneAround.com and start stiffening the wheel pant to the gear. Then I will start finding a good way change the moment of inertia of the gear leg, stiffening it in the front to back direction.
I've been told by Vans not to worry about it. Just think of it as a massage with every landing.
I will find a way to eliminate it though.
Let me know if you find anything out.
Thanks, Scott
On Jan 23, 2011, at 6:40 PM, "Roger Standley" <taildragon(at)msn.com (taildragon(at)msn.com)> wrote:
[quote] <?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]-->
Today I was able to have a guy observe the gear up close as I was landing. I have been feeling a shake during roll out below 30 mph. Sometimes not too much but sometimes significant. Applying brakes seems to make it worse but nothing will make it stop until slowing below 20 mph. Speeds above 30 mph are smooth. He said that the left main was shaking and it looked to be rapidly moving forward and back.
Are others noticing this shaking? Is there a fix or a way to minimize the shaking that anyone has discovered?
Thank you,
Roger Standley
N291RV
165 hours
[b]
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
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jesse(at)saintaviation.co
Guest
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| Posted: Mon Feb 07, 2011 8:03 am Post subject: Landing gear shake |
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I just did a condition inspection on N256H. Before the condition it had a fair bit of shimmy in the 25-30 mph range after landing. I added another spacer on the nose gear shock strut and tightened the nose gear pivot nut one flat. Most of the shimmy went away.
Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com (jesse(at)saintaviation.com)
C: 352-427-0285
F: 815-377-3694
On Feb 6, 2011, at 2:09 AM, Scott Schmidt wrote:
| Quote: | I have posted on this topic before.
Mine does the exact same at the same speeds as does many other RV-10's.
Sometimes balancing the tire fixes/helps, sometimes different tires, pressures, ect.
I have tried most with no success. I have talked with Van about it and he indicated that his personal plane even did it. I have also heard that when people installed the wheel pants it started. It all comes down to a poor gear design. A round gear leg is not the optimal design for a landing gear but is the cheapest shape from a manufacturing point of view.
It is not the caliper either. Even if I slow down with no braking it occurs. I can replicate it on the ground with one wheel jacked up and use my buffer to get the wheel up to 50 mph and when it slows to around 25 mph, it shakes. It is the system hitting a natural frequency.
Van said people have put a block of wood on the backside of other RV models to stop it.
I spent a considerable amount of time re-drilling my gear legs to get the exact toe-in on both sides and it did not change one thing. I have tried two different sets of tires, pressures from 25-60 psi all with no luck. My next plan, when I get to it, is to install the wheel pant spacers from PlaneAround.com and start stiffening the wheel pant to the gear. Then I will start finding a good way change the moment of inertia of the gear leg, stiffening it in the front to back direction.
I've been told by Vans not to worry about it. Just think of it as a massage with every landing.
I will find a way to eliminate it though.
Let me know if you find anything out.
Thanks, Scott
On Jan 23, 2011, at 6:40 PM, "Roger Standley" <taildragon(at)msn.com (taildragon(at)msn.com)> wrote:
| Quote: | <?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]-->
Today I was able to have a guy observe the gear up close as I was landing. I have been feeling a shake during roll out below 30 mph. Sometimes not too much but sometimes significant. Applying brakes seems to make it worse but nothing will make it stop until slowing below 20 mph. Speeds above 30 mph are smooth. He said that the left main was shaking and it looked to be rapidly moving forward and back.
Are others noticing this shaking? Is there a fix or a way to minimize the shaking that anyone has discovered?
Thank you,
Roger Standley
N291RV
165 hours
href="http://www.matronics.com/Navigator?RV10-List">http://www.matronics.com/Navigator?RV10-List
href="http://forums.matronics.com/">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/contribution
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[quote][b]
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aerosport1
Joined: 07 Nov 2007
Posts: 231
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| Posted: Mon Feb 07, 2011 8:41 am Post subject: Landing gear shake |
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I mounted a camera on the bottom of my RV-10 to find out what was shaking and what was not. The main gear has a shake at 34 kts and started
When I put my wheel pants on. I have balanced and changed air pressures with no real success. The nose gear would shimmy at 15kts if
Tension was loose. The camera shows the wheel pants get into an oscillating motion. It is an up down motion. And as Scott I believe it is from the
Poor gear design. I have no noticeable shake on grass. My shake seems to be worse with more load in the airplane. That being said I can break hard
quick thru it and without much shake.
Geoff
[b]Geoff Combs[/b]
President
[b]614-834-5227p[/b]
614-834-5230f
www.aerosportmodeling.com
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Jesse Saint
Sent: Monday, February 07, 2011 10:59 AM
To: rv10-list(at)matronics.com
Subject: Re: Landing gear shake
I just did a condition inspection on N256H. Before the condition it had a fair bit of shimmy in the 25-30 mph range after landing. I added another spacer on the nose gear shock strut and tightened the nose gear pivot nut one flat. Most of the shimmy went away.
Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com (jesse(at)saintaviation.com)
C: 352-427-0285
F: 815-377-3694
On Feb 6, 2011, at 2:09 AM, Scott Schmidt wrote:
I have posted on this topic before.
Mine does the exact same at the same speeds as does many other RV-10's.
Sometimes balancing the tire fixes/helps, sometimes different tires, pressures, ect.
I have tried most with no success. I have talked with Van about it and he indicated that his personal plane even did it. I have also heard that when people installed the wheel pants it started. It all comes down to a poor gear design. A round gear leg is not the optimal design for a landing gear but is the cheapest shape from a manufacturing point of view.
It is not the caliper either. Even if I slow down with no braking it occurs. I can replicate it on the ground with one wheel jacked up and use my buffer to get the wheel up to 50 mph and when it slows to around 25 mph, it shakes. It is the system hitting a natural frequency.
Van said people have put a block of wood on the backside of other RV models to stop it.
I spent a considerable amount of time re-drilling my gear legs to get the exact toe-in on both sides and it did not change one thing. I have tried two different sets of tires, pressures from 25-60 psi all with no luck. My next plan, when I get to it, is to install the wheel pant spacers from PlaneAround.com and start stiffening the wheel pant to the gear. Then I will start finding a good way change the moment of inertia of the gear leg, stiffening it in the front to back direction.
I've been told by Vans not to worry about it. Just think of it as a massage with every landing.
I will find a way to eliminate it though.
Let me know if you find anything out.
Thanks, Scott
On Jan 23, 2011, at 6:40 PM, "Roger Standley" <taildragon(at)msn.com (taildragon(at)msn.com)> wrote:
| Quote: |
Today I was able to have a guy observe the gear up close as I was landing. I have been feeling a shake during roll out below 30 mph. Sometimes not too much but sometimes significant. Applying brakes seems to make it worse but nothing will make it stop until slowing below 20 mph. Speeds above 30 mph are smooth. He said that the left main was shaking and it looked to be rapidly moving forward and back.
Are others noticing this shaking? Is there a fix or a way to minimize the shaking that anyone has discovered?
Thank you,
Roger Standley
N291RV
165 hours
|
012345
6 [quote][b]
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
|
_________________
Geoff Combs
RV-10 QB N829GW
Flying 500 hrs
40033 |
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dmaib@me.com
Joined: 25 Apr 2006
Posts: 454
Location: New Smyrna Beach, Florida
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| Posted: Mon Feb 07, 2011 8:52 am Post subject: Landing gear shake |
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I did exactly the same thing as Geoff and got exactly the same results.
David Maib
40559
340 hours
On Feb 7, 2011, at 11:34 AM, Geoff Combs wrote:
| Quote: | st1\:*{behavior:url(#default#ieooui) } <![endif]-->
I mounted a camera on the bottom of my RV-10 to find out what was shaking and what was not. The main gear has a shake at 34 kts and started
When I put my wheel pants on. I have balanced and changed air pressures with no real success. The nose gear would shimmy at 15kts if
Tension was loose. The camera shows the wheel pants get into an oscillating motion. It is an up down motion. And as Scott I believe it is from the
Poor gear design. I have no noticeable shake on grass. My shake seems to be worse with more load in the airplane. That being said I can break hard
quick thru it and without much shake.
Geoff
[b]Geoff Combs[/b]
President
[b]614-834-5227p[/b]
614-834-5230f
www.aerosportmodeling.com
From: owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com) [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Jesse Saint
Sent: Monday, February 07, 2011 10:59 AM
To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)
Subject: Re: Landing gear shake
I just did a condition inspection on N256H. Before the condition it had a fair bit of shimmy in the 25-30 mph range after landing. I added another spacer on the nose gear shock strut and tightened the nose gear pivot nut one flat. Most of the shimmy went away.
Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com (jesse(at)saintaviation.com)
C: 352-427-0285
F: 815-377-3694
On Feb 6, 2011, at 2:09 AM, Scott Schmidt wrote:
I have posted on this topic before.
Mine does the exact same at the same speeds as does many other RV-10's.
Sometimes balancing the tire fixes/helps, sometimes different tires, pressures, ect.
I have tried most with no success. I have talked with Van about it and he indicated that his personal plane even did it. I have also heard that when people installed the wheel pants it started. It all comes down to a poor gear design. A round gear leg is not the optimal design for a landing gear but is the cheapest shape from a manufacturing point of view.
It is not the caliper either. Even if I slow down with no braking it occurs. I can replicate it on the ground with one wheel jacked up and use my buffer to get the wheel up to 50 mph and when it slows to around 25 mph, it shakes. It is the system hitting a natural frequency.
Van said people have put a block of wood on the backside of other RV models to stop it.
I spent a considerable amount of time re-drilling my gear legs to get the exact toe-in on both sides and it did not change one thing. I have tried two different sets of tires, pressures from 25-60 psi all with no luck. My next plan, when I get to it, is to install the wheel pant spacers from PlaneAround.com and start stiffening the wheel pant to the gear. Then I will start finding a good way change the moment of inertia of the gear leg, stiffening it in the front to back direction.
I've been told by Vans not to worry about it. Just think of it as a massage with every landing.
I will find a way to eliminate it though.
Let me know if you find anything out.
Thanks, Scott
On Jan 23, 2011, at 6:40 PM, "Roger Standley" <taildragon(at)msn.com (taildragon(at)msn.com)> wrote:
| Quote: |
Today I was able to have a guy observe the gear up close as I was landing. I have been feeling a shake during roll out below 30 mph. Sometimes not too much but sometimes significant. Applying brakes seems to make it worse but nothing will make it stop until slowing below 20 mph. Speeds above 30 mph are smooth. He said that the left main was shaking and it looked to be rapidly moving forward and back.
Are others noticing this shaking? Is there a fix or a way to minimize the shaking that anyone has discovered?
Thank you,
Roger Standley
N291RV
165 hours
|
012345
6 7
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| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
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_________________
David Maib
RV-10 #40559
New Smyrna Beach, FL |
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scottmschmidt(at)yahoo.co
Guest
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| Posted: Mon Feb 07, 2011 9:23 am Post subject: Landing gear shake |
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Jesse, I really like what you tried and have thought about it. I never had a shake until around 100 - 150 hours. If the front gear settles down slightly it changes the toe-in.
If it is still possible can you measure the distance between the prop and the ground?
Where did you purchase the spacer?
Scott Schmidt
From: Jesse Saint <jesse(at)saintaviation.com>
To: rv10-list(at)matronics.com
Sent: Mon, February 7, 2011 8:59:26 AM
Subject: Re: Landing gear shake
I just did a condition inspection on N256H. Before the condition it had a fair bit of shimmy in the 25-30 mph range after landing. I added another spacer on the nose gear shock strut and tightened the nose gear pivot nut one flat. Most of the shimmy went away.
Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com (jesse(at)saintaviation.com)
C: 352-427-0285
F: 815-377-3694
On Feb 6, 2011, at 2:09 AM, Scott Schmidt wrote:
[quote]I have posted on this topic before.
Mine does the exact same at the same speeds as does many other RV-10's.
Sometimes balancing the tire fixes/helps, sometimes different tires, pressures, ect.
I have tried most with no success. I have talked with Van about it and he indicated that his personal plane even did it. I have also heard that when people installed the wheel pants it started. It all comes down to a poor gear design. A round gear leg is not the optimal design for a landing gear but is the cheapest shape from a manufacturing point of view.
It is not the caliper either. Even if I slow down with no braking it occurs. I can replicate it on the ground with one wheel jacked up and use my buffer to get the wheel up to 50 mph and when it slows to around 25 mph, it shakes. It is the system hitting a natural frequency.
Van said people have put a block of wood on the backside of other RV models to stop it.
I spent a considerable amount of time re-drilling my gear legs to get the exact toe-in on both sides and it did not change one thing. I have tried two different sets of tires, pressures from 25-60 psi all with no luck. My next plan, when I get to it, is to install the wheel pant spacers from PlaneAround.com and start stiffening the wheel pant to the gear. Then I will start finding a good way change the moment of inertia of the gear leg, stiffening it in the front to back direction.
I've been told by Vans not to worry about it. Just think of it as a massage with every landing.
I will find a way to eliminate it though.
Let me know if you find anything out.
Thanks, Scott
On Jan 23, 2011, at 6:40 PM, "Roger Standley" <taildragon(at)msn.com (taildragon(at)msn.com)> wrote:
[b]
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scottmschmidt(at)yahoo.co
Guest
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| Posted: Mon Feb 07, 2011 9:23 am Post subject: Landing gear shake |
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One more question, how did you know you needed to add a spacer during the conditional inspection?
Is there something you are looking at?
Scott Schmidt
From: Jesse Saint <jesse(at)saintaviation.com>
To: rv10-list(at)matronics.com
Sent: Mon, February 7, 2011 8:59:26 AM
Subject: Re: Landing gear shake
I just did a condition inspection on N256H. Before the condition it had a fair bit of shimmy in the 25-30 mph range after landing. I added another spacer on the nose gear shock strut and tightened the nose gear pivot nut one flat. Most of the shimmy went away.
Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com (jesse(at)saintaviation.com)
C: 352-427-0285
F: 815-377-3694
On Feb 6, 2011, at 2:09 AM, Scott Schmidt wrote:
[quote]I have posted on this topic before.
Mine does the exact same at the same speeds as does many other RV-10's.
Sometimes balancing the tire fixes/helps, sometimes different tires, pressures, ect.
I have tried most with no success. I have talked with Van about it and he indicated that his personal plane even did it. I have also heard that when people installed the wheel pants it started. It all comes down to a poor gear design. A round gear leg is not the optimal design for a landing gear but is the cheapest shape from a manufacturing point of view.
It is not the caliper either. Even if I slow down with no braking it occurs. I can replicate it on the ground with one wheel jacked up and use my buffer to get the wheel up to 50 mph and when it slows to around 25 mph, it shakes. It is the system hitting a natural frequency.
Van said people have put a block of wood on the backside of other RV models to stop it.
I spent a considerable amount of time re-drilling my gear legs to get the exact toe-in on both sides and it did not change one thing. I have tried two different sets of tires, pressures from 25-60 psi all with no luck. My next plan, when I get to it, is to install the wheel pant spacers from PlaneAround.com and start stiffening the wheel pant to the gear. Then I will start finding a good way change the moment of inertia of the gear leg, stiffening it in the front to back direction.
I've been told by Vans not to worry about it. Just think of it as a massage with every landing.
I will find a way to eliminate it though.
Let me know if you find anything out.
Thanks, Scott
On Jan 23, 2011, at 6:40 PM, "Roger Standley" <taildragon(at)msn.com (taildragon(at)msn.com)> wrote:
[b]
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rene(at)felker.com
Guest
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| Posted: Mon Feb 07, 2011 9:44 am Post subject: Landing gear shake |
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Jesse, I am also interested in how to tell you need an additional spacer. My condition inspection starts at the end of this month……I have 150 tack hours on the airplane.
Scott, there were two spacers provide in the kit……now if I can just find the second one……
Rene' Felker
N423CF
801-721-6080
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Scott Schmidt
Sent: Monday, February 07, 2011 10:17 AM
To: rv10-list(at)matronics.com
Subject: Re: Landing gear shake
Jesse, I really like what you tried and have thought about it. I never had a shake until around 100 - 150 hours. If the front gear settles down slightly it changes the toe-in.
If it is still possible can you measure the distance between the prop and the ground?
Where did you purchase the spacer?
Scott Schmidt
From: Jesse Saint <jesse(at)saintaviation.com>
To: rv10-list(at)matronics.com
Sent: Mon, February 7, 2011 8:59:26 AM
Subject: Re: Landing gear shake
I just did a condition inspection on N256H. Before the condition it had a fair bit of shimmy in the 25-30 mph range after landing. I added another spacer on the nose gear shock strut and tightened the nose gear pivot nut one flat. Most of the shimmy went away.
Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com (jesse(at)saintaviation.com)
C: 352-427-0285
F: 815-377-3694
On Feb 6, 2011, at 2:09 AM, Scott Schmidt wrote:
I have posted on this topic before.
Mine does the exact same at the same speeds as does many other RV-10's.
Sometimes balancing the tire fixes/helps, sometimes different tires, pressures, ect.
I have tried most with no success. I have talked with Van about it and he indicated that his personal plane even did it. I have also heard that when people installed the wheel pants it started. It all comes down to a poor gear design. A round gear leg is not the optimal design for a landing gear but is the cheapest shape from a manufacturing point of view.
It is not the caliper either. Even if I slow down with no braking it occurs. I can replicate it on the ground with one wheel jacked up and use my buffer to get the wheel up to 50 mph and when it slows to around 25 mph, it shakes. It is the system hitting a natural frequency.
Van said people have put a block of wood on the backside of other RV models to stop it.
I spent a considerable amount of time re-drilling my gear legs to get the exact toe-in on both sides and it did not change one thing. I have tried two different sets of tires, pressures from 25-60 psi all with no luck. My next plan, when I get to it, is to install the wheel pant spacers from PlaneAround.com and start stiffening the wheel pant to the gear. Then I will start finding a good way change the moment of inertia of the gear leg, stiffening it in the front to back direction.
I've been told by Vans not to worry about it. Just think of it as a massage with every landing.
I will find a way to eliminate it though.
Let me know if you find anything out.
Thanks, Scott
On Jan 23, 2011, at 6:40 PM, "Roger Standley" <taildragon(at)msn.com (taildragon(at)msn.com)> wrote:
012
345678901234567890
[quote][b]
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jesse(at)saintaviation.co
Guest
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| Posted: Mon Feb 07, 2011 9:51 am Post subject: Landing gear shake |
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The spacer came from Van's. It's part # U-1002 on page 46-07. I had someone hold the tail down and then I lifted up on the nose gear to see if it was tight. It moved, so I knew it needed another spacer. You can also tell if the bolt holding the cap on can move freely when you loosen the nut. The distance from the prop to the ground depends on how the engine hangs on the engine mounts and other things, but I'll measure it...7.5".
Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com (jesse(at)saintaviation.com)
C: 352-427-0285
F: 815-377-3694
On Feb 7, 2011, at 12:16 PM, Scott Schmidt wrote:
| Quote: | Jesse, I really like what you tried and have thought about it. I never had a shake until around 100 - 150 hours. If the front gear settles down slightly it changes the toe-in.
If it is still possible can you measure the distance between the prop and the ground?
Where did you purchase the spacer?
Scott Schmidt
From: Jesse Saint <jesse(at)saintaviation.com (jesse(at)saintaviation.com)>
To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)
Sent: Mon, February 7, 2011 8:59:26 AM
Subject: Re: Landing gear shake
I just did a condition inspection on N256H. Before the condition it had a fair bit of shimmy in the 25-30 mph range after landing. I added another spacer on the nose gear shock strut and tightened the nose gear pivot nut one flat. Most of the shimmy went away.
Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com (jesse(at)saintaviation.com)
C: 352-427-0285
F: 815-377-3694
On Feb 6, 2011, at 2:09 AM, Scott Schmidt wrote:
| Quote: | I have posted on this topic before.
Mine does the exact same at the same speeds as does many other RV-10's.
Sometimes balancing the tire fixes/helps, sometimes different tires, pressures, ect.
I have tried most with no success. I have talked with Van about it and he indicated that his personal plane even did it. I have also heard that when people installed the wheel pants it started. It all comes down to a poor gear design. A round gear leg is not the optimal design for a landing gear but is the cheapest shape from a manufacturing point of view.
It is not the caliper either. Even if I slow down with no braking it occurs. I can replicate it on the ground with one wheel jacked up and use my buffer to get the wheel up to 50 mph and when it slows to around 25 mph, it shakes. It is the system hitting a natural frequency.
Van said people have put a block of wood on the backside of other RV models to stop it.
I spent a considerable amount of time re-drilling my gear legs to get the exact toe-in on both sides and it did not change one thing. I have tried two different sets of tires, pressures from 25-60 psi all with no luck. My next plan, when I get to it, is to install the wheel pant spacers from PlaneAround.com and start stiffening the wheel pant to the gear. Then I will start finding a good way change the moment of inertia of the gear leg, stiffening it in the front to back direction.
I've been told by Vans not to worry about it. Just think of it as a massage with every landing.
I will find a way to eliminate it though.
Let me know if you find anything out.
Thanks, Scott
On Jan 23, 2011, at 6:40 PM, "Roger Standley" <taildragon(at)msn.com (taildragon(at)msn.com)> wrote:
href="http://www.matronics.com/Navigator?RV10-List">http://www.matronics.com/Navigator?RV10-List
href="http://forums.matronics.com/">http://forums.matronics.com
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Kelly McMullen
Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ
|
| Posted: Mon Feb 07, 2011 12:57 pm Post subject: Landing gear shake |
|
|
Has anyone tried counter balancing the wheel pants with some weight up
front, just like your control surfaces have? I don't remember where I
heard that suggestion, but might make sense to change the harmonic
frequency of the wheel pants.
Kellyt
On Mon, Feb 7, 2011 at 9:34 AM, Geoff Combs
<g.combs(at)aerosportmodeling.com> wrote:
| Quote: | I mounted a camera on the bottom of my RV-10 to find out what was shaking
and what was not. The main gear has a shake at 34 kts and started
When I put my wheel pants on. I have balanced and changed air pressures with
no real success. The nose gear would shimmy at 15kts if
Tension was loose. The camera shows the wheel pants get into an oscillating
motion. It is an up down motion. And as Scott I believe it is from the
Poor gear design. I have no noticeable shake on grass. My shake seems to be
worse with more load in the airplane. That being said I can break hard
quick thru it and without much shake.
Geoff
Geoff Combs
President
614-834-5227p
614-834-5230f
www.aerosportmodeling.com
________________________________
From: owner-rv10-list-server(at)matronics.com
[mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Jesse Saint
Sent: Monday, February 07, 2011 10:59 AM
To: rv10-list(at)matronics.com
Subject: Re: Landing gear shake
I just did a condition inspection on N256H. Before the condition it had a
fair bit of shimmy in the 25-30 mph range after landing. I added another
spacer on the nose gear shock strut and tightened the nose gear pivot nut
one flat. Most of the shimmy went away.
Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com
C: 352-427-0285
F: 815-377-3694
On Feb 6, 2011, at 2:09 AM, Scott Schmidt wrote:
I have posted on this topic before.
Mine does the exact same at the same speeds as does many other RV-10's.
Sometimes balancing the tire fixes/helps, sometimes different tires,
pressures, ect.
I have tried most with no success. I have talked with Van about it and he
indicated that his personal plane even did it. I have also heard that when
people installed the wheel pants it started. It all comes down to a poor
gear design. A round gear leg is not the optimal design for a landing gear
but is the cheapest shape from a manufacturing point of view.
It is not the caliper either. Even if I slow down with no braking it occurs.
I can replicate it on the ground with one wheel jacked up and use my buffer
to get the wheel up to 50 mph and when it slows to around 25 mph, it shakes.
It is the system hitting a natural frequency.
Van said people have put a block of wood on the backside of other RV models
to stop it.
I spent a considerable amount of time re-drilling my gear legs to get the
exact toe-in on both sides and it did not change one thing. I have tried two
different sets of tires, pressures from 25-60 psi all with no luck. My next
plan, when I get to it, is to install the wheel pant spacers from
PlaneAround.com and start stiffening the wheel pant to the gear. Then I will
start finding a good way change the moment of inertia of the gear leg,
stiffening it in the front to back direction.
I've been told by Vans not to worry about it. Just think of it as a massage
with every landing.
I will find a way to eliminate it though.
Let me know if you find anything out.
Thanks, Scott
On Jan 23, 2011, at 6:40 PM, "Roger Standley" <taildragon(at)msn.com> wrote:
Today I was able to have a guy observe the gear up close as I was landing.
I have been feeling a shake during roll out below 30 mph. Sometimes not too
much but sometimes significant. Applying brakes seems to make it worse but
nothing will make it stop until slowing below 20 mph. Speeds above 30 mph
are smooth. He said that the left main was shaking and it looked to be
rapidly moving forward and back.
Are others noticing this shaking? Is there a fix or a way to minimize the
shaking that anyone has discovered?
Thank you,
Roger Standley
N291RV
165 hours
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rv10builder(at)verizon.ne
Guest
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| Posted: Mon Feb 07, 2011 1:42 pm Post subject: Landing gear shake |
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Tim Olson and a few others. Tim has the writeup on his website.
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partner14
Joined: 12 Jan 2008
Posts: 540
Location: Granbury Texas
|
| Posted: Mon Feb 07, 2011 1:42 pm Post subject: Landing gear shake |
|
|
Yep. lot's of us have done it.... but it seems we all end up with some amount of "shake". Mine disappeared totally.... for quite a while after installing Goodyear FCIII's. I have a small amount now, but acceptable. Always try to avoid braking as long as possible.
Don
From: Kelly McMullen <apilot2(at)gmail.com>
To: rv10-list(at)matronics.com
Sent: Mon, February 7, 2011 2:17:06 PM
Subject: Re: Landing gear shake
--> RV10-List message posted by: Kelly McMullen <apilot2(at)gmail.com (apilot2(at)gmail.com)>
Has anyone tried counter balancing the wheel pants with some weight up
front, just like your control surfaces have? I don't remember where I
heard that suggestion, but might make sense to change the harmonic
frequency of the wheel pants.
Kellyt
On Mon, Feb 7, 2011 at 9:34 AM, Geoff Combs
<g.combs(at)aerosportmodeling.com (g.combs(at)aerosportmodeling.com)> wrote:
| Quote: | I mounted a camera on the bottom of my RV-10 to find out what was shaking
and what was not. The main gear has a shake at 34 kts and started
When I put my wheel pants on. I have balanced and changed air pressures with
no real success. The nose gear would shimmy at 15kts if
Tension was loose. The camera shows the wheel pants get into an oscillating
motion. It is an up down motion. And as Scott I believe it is from the
Poor gear design. I have no noticeable shake on grass. My shake seems to be
worse with more load in the airplane. That being said I can break hard
quick thru it and without much shake.
Geoff
Geoff Combs
President
614-834-5227p
614-834-5230f
www.aerosportmodeling.com
________________________________
From: owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com)
[mailto:owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com)] On Behalf Of Jesse Saint
Sent: Monday, February 07, 2011 10:59 AM
To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)
Subject: Re: Landing gear shake
I just did a condition inspection on N256H. Before the condition it had a
fair bit of shimmy in the 25-30 mph range after landing. I added another
spacer on the nose gear shock strut and tightened the nose gear pivot nut
one flat. Most of the shimmy went away.
Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com (jesse(at)saintaviation.com)
C: 352-427-0285
F: 815-377-3694
On Feb 6, 2011, at 2:09 AM, Scott Schmidt wrote:
I have posted on this topic before.
Mine does the exact same at the same speeds as does many other RV-10's.
Sometimes balancing the tire fixes/helps, sometimes different tires,
pressures, ect.
I have tried most with no success. I have talked with Van about it and he
indicated that his personal plane even did it. I have also heard that when
people installed the wheel pants it started. It all comes down to a poor
gear design. A round gear leg is not the optimal design for a landing gear
but is the cheapest shape from a manufacturing point of view.
It is not the caliper either. Even if I slow down with no braking it occurs.
I can replicate it on the ground with one wheel jacked up and use my buffer
to get the wheel up to 50 mph and when it slows to around 25 mph, it shakes.
It is the system hitting a natural frequency.
Van said people have put a block of wood on the backside of other RV models
to stop it.
I spent a considerable amount of time re-drilling my gear legs to get the
exact toe-in on both sides and it did not change one thing. I have tried two
different sets of tires, pressures from 25-60 psi all with no luck. My next
plan, when I get to it, is to install the wheel pant spacers from
PlaneAround.com and start stiffening the wheel pant to the gear. Then I will
start finding a good way change the moment of inertia of the gear leg,
stiffening it in the front to back direction.
I've been told by Vans not to worry about it. Just think of it as a massage
with every landing.
I will find a way to eliminate it though.
Let me know if you find anything out.
Thanks, Scott
On Jan 23, 2011, at 6:40 PM, "Roger Standley" <taildragon(at)msn.com (taildragon(at)msn.com)> wrote:
Today I was able to have a guy observe the gear up close as I was landing.
I have been feeling a shake during roll out below 30 mph. Sometimes not too
much but sometimes significant. Applying brakes seems to make it worse but
nothing will make it stop until slowing below 20 mph. Speeds above 30 mph
are smooth. He said that the left main was shaking and it looked to be
rapidly moving forward and back.
Are others noticing this shaking? Is there a fix or a way to minimize the
shaking that anyone has discovered?
Thank you,
Roger Standley
N291RV
165 hours
==========
ref="http://www.matronics.com/Navigator?RV10-List">http://www.matronics.com/Navigator?RV10-List
==========
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==========
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scottmschmidt(at)yahoo.co
Guest
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| Posted: Mon Feb 07, 2011 2:29 pm Post subject: Landing gear shake |
|
|
Yes, I did that as well with no change.
Scott Schmidt
From: Kelly McMullen <apilot2(at)gmail.com>
To: rv10-list(at)matronics.com
Sent: Mon, February 7, 2011 1:17:06 PM
Subject: Re: Landing gear shake
--> RV10-List message posted by: Kelly McMullen <apilot2(at)gmail.com (apilot2(at)gmail.com)>
Has anyone tried counter balancing the wheel pants with some weight up
front, just like your control surfaces have? I don't remember where I
heard that suggestion, but might make sense to change the harmonic
frequency of the wheel pants.
Kellyt
On Mon, Feb 7, 2011 at 9:34 AM, Geoff Combs
<g.combs(at)aerosportmodeling.com (g.combs(at)aerosportmodeling.com)> wrote:
[quote] I mounted a camera on the bottom of my RV-10 to find out what was shaking
and what was not. The main gear has a shake at 34 kts and started
When I put my wheel pants on. I have balanced and changed air pressures with
no real success. The nose gear would shimmy at 15kts if
Tension was loose. The camera shows the wheel pants get into an oscillating
motion. It is an up down motion. And as Scott I believe it is from the
Poor gear design. I have no noticeable shake on grass. My shake seems to be
worse with more load in the airplane. That being said I can break hard
quick thru it and without much shake.
Geoff
Geoff Combs
President
614-834-5227p
614-834-5230f
www.aerosportmodeling.com
________________________________
From: owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com)
[mailto:owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com)] On Behalf Of Jesse Saint
Sent: Monday, February 07, 2011 10:59 AM
To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)
Subject: Re: Landing gear shake
I just did a condition inspection on N256H. Before the condition it had a
fair bit of shimmy in the 25-30 mph range after landing. I added another
spacer on the nose gear shock strut and tightened the nose gear pivot nut
one flat. Most of the shimmy went away.
Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com (jesse(at)saintaviation.com)
C: 352-427-0285
F: 815-377-3694
On Feb 6, 2011, at 2:09 AM, Scott Schmidt wrote:
I have posted on this topic before.
Mine does the exact same at the same speeds as does many other RV-10's.
Sometimes balancing the tire fixes/helps, sometimes different tires,
pressures, ect.
I have tried most with no success. I have talked with Van about it and he
indicated that his personal plane even did it. I have also heard that when
people installed the wheel pants it started. It all comes down to a poor
gear design. A round gear leg is not the optimal design for a landing gear
but is the cheapest shape from a manufacturing point of view.
It is not the caliper either. Even if I slow down with no braking it occurs.
I can replicate it on the ground with one wheel jacked up and use my buffer
to get the wheel up to 50 mph and when it slows to around 25 mph, it shakes.
It is the system hitting a natural frequency.
Van said people have put a block of wood on the backside of other RV models
to stop it.
I spent a considerable amount of time re-drilling my gear legs to get the
exact toe-in on both sides and it did not change one thing. I have tried two
different sets of tires, pressures from 25-60 psi all with no luck. My next
plan, when I get to it, is to install the wheel pant spacers from
PlaneAround.com and start stiffening the wheel pant to the gear. Then I will
start finding a good way change the moment of inertia of the gear leg,
stiffening it in the front to back direction.
I've been told by Vans not to worry about it. Just think of it as a massage
with every landing.
I will find a way to eliminate it though.
Let me know if you find anything out.
Thanks, Scott
On Jan 23, 2011, at 6:40 PM, "Roger Standley" <taildragon(at)msn.com (taildragon(at)msn.com)> wrote:
Today I was able to have a guy observe the gear up close as I was landing.
I have been feeling a shake during roll out below 30 mph. Sometimes not too
much but sometimes significant. Applying brakes seems to make it worse but
nothing will make it stop until slowing below 20 mph. Speeds above 30 mph
are smooth. He said that the left main was shaking and it looked to be
rapidly moving forward and back.
Are others noticing this shaking? Is there a fix or a way to minimize the
shaking that anyone has discovered?
Thank you,
Roger Standley
N291RV
165 hours
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scottmschmidt(at)yahoo.co
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| Posted: Mon Feb 07, 2011 2:32 pm Post subject: Landing gear shake |
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Mine measured at 8 11/32". Don't know if there is any slop in the rubber discs yet.
Interesting it is over one 1" taller.
Scott Schmidt
From: Jesse Saint <jesse(at)saintaviation.com>
To: rv10-list(at)matronics.com
Sent: Mon, February 7, 2011 10:47:58 AM
Subject: Re: Landing gear shake
The spacer came from Van's. It's part # U-1002 on page 46-07. I had someone hold the tail down and then I lifted up on the nose gear to see if it was tight. It moved, so I knew it needed another spacer. You can also tell if the bolt holding the cap on can move freely when you loosen the nut. The distance from the prop to the ground depends on how the engine hangs on the engine mounts and other things, but I'll measure it...7.5".
Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com (jesse(at)saintaviation.com)
C: 352-427-0285
F: 815-377-3694
On Feb 7, 2011, at 12:16 PM, Scott Schmidt wrote:
[quote]Jesse, I really like what you tried and have thought about it. I never had a shake until around 100 - 150 hours. If the front gear settles down slightly it changes the toe-in.
If it is still possible can you measure the distance between the prop and the ground?
Where did you purchase the spacer?
Scott Schmidt
From: Jesse Saint <jesse(at)saintaviation.com (jesse(at)saintaviation.com)>
To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)
Sent: Mon, February 7, 2011 8:59:26 AM
Subject: Re: Landing gear shake
I just did a condition inspection on N256H. Before the condition it had a fair bit of shimmy in the 25-30 mph range after landing. I added another spacer on the nose gear shock strut and tightened the nose gear pivot nut one flat. Most of the shimmy went away.
Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com (jesse(at)saintaviation.com)
C: 352-427-0285
F: 815-377-3694
On Feb 6, 2011, at 2:09 AM, Scott Schmidt wrote:
| Quote: | I have posted on this topic before.
Mine does the exact same at the same speeds as does many other RV-10's.
Sometimes balancing the tire fixes/helps, sometimes different tires, pressures, ect.
I have tried most with no success. I have talked with Van about it and he indicated that his personal plane even did it. I have also heard that when people installed the wheel pants it started. It all comes down to a poor gear design. A round gear leg is not the optimal design for a landing gear but is the cheapest shape from a manufacturing point of view.
It is not the caliper either. Even if I slow down with no braking it occurs. I can replicate it on the ground with one wheel jacked up and use my buffer to get the wheel up to 50 mph and when it slows to around 25 mph, it shakes. It is the system hitting a natural frequency.
Van said people have put a block of wood on the backside of other RV models to stop it.
I spent a considerable amount of time re-drilling my gear legs to get the exact toe-in on both sides and it did not change one thing. I have tried two different sets of tires, pressures from 25-60 psi all with no luck. My next plan, when I get to it, is to install the wheel pant spacers from PlaneAround.com and start stiffening the wheel pant to the gear. Then I will start finding a good way change the moment of inertia of the gear leg, stiffening it in the front to back direction.
I've been told by Vans not to worry about it. Just think of it as a massage with every landing.
I will find a way to eliminate it though.
Let me know if you find anything out.
Thanks, Scott
On Jan 23, 2011, at 6:40 PM, "Roger Standley" <taildragon(at)msn.com (taildragon(at)msn.com)> wrote:
href="http://www.matronics.com/Navigator?RV10-List">http://www.matronics.com/Navigator?RV10-Listhref="http://forums.matronics.com/">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/contribution
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jesse(at)saintaviation.co
Guest
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| Posted: Mon Feb 07, 2011 2:52 pm Post subject: Landing gear shake |
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|
Not to be anal, but 8 11/32 - 7.5 (7 16/32) is not more than an inch, but it's not important. It could really depend on how the plane is sitting, loaded, fueled, etc.
do not archive
Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com (jesse(at)saintaviation.com)
C: 352-427-0285
F: 815-377-3694
On Feb 7, 2011, at 5:28 PM, Scott Schmidt wrote:
| Quote: | Mine measured at 8 11/32". Don't know if there is any slop in the rubber discs yet.
Interesting it is over one 1" taller.
Scott Schmidt
From: Jesse Saint <jesse(at)saintaviation.com (jesse(at)saintaviation.com)>
To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)
Sent: Mon, February 7, 2011 10:47:58 AM
Subject: Re: Landing gear shake
The spacer came from Van's. It's part # U-1002 on page 46-07. I had someone hold the tail down and then I lifted up on the nose gear to see if it was tight. It moved, so I knew it needed another spacer. You can also tell if the bolt holding the cap on can move freely when you loosen the nut. The distance from the prop to the ground depends on how the engine hangs on the engine mounts and other things, but I'll measure it...7.5".
Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com (jesse(at)saintaviation.com)
C: 352-427-0285
F: 815-377-3694
On Feb 7, 2011, at 12:16 PM, Scott Schmidt wrote:
| Quote: | Jesse, I really like what you tried and have thought about it. I never had a shake until around 100 - 150 hours. If the front gear settles down slightly it changes the toe-in.
If it is still possible can you measure the distance between the prop and the ground?
Where did you purchase the spacer?
Scott Schmidt
From: Jesse Saint <jesse(at)saintaviation.com (jesse(at)saintaviation.com)>
To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)
Sent: Mon, February 7, 2011 8:59:26 AM
Subject: Re: Landing gear shake
I just did a condition inspection on N256H. Before the condition it had a fair bit of shimmy in the 25-30 mph range after landing. I added another spacer on the nose gear shock strut and tightened the nose gear pivot nut one flat. Most of the shimmy went away.
Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com (jesse(at)saintaviation.com)
C: 352-427-0285
F: 815-377-3694
On Feb 6, 2011, at 2:09 AM, Scott Schmidt wrote:
| Quote: | I have posted on this topic before.
Mine does the exact same at the same speeds as does many other RV-10's.
Sometimes balancing the tire fixes/helps, sometimes different tires, pressures, ect.
I have tried most with no success. I have talked with Van about it and he indicated that his personal plane even did it. I have also heard that when people installed the wheel pants it started. It all comes down to a poor gear design. A round gear leg is not the optimal design for a landing gear but is the cheapest shape from a manufacturing point of view.
It is not the caliper either. Even if I slow down with no braking it occurs. I can replicate it on the ground with one wheel jacked up and use my buffer to get the wheel up to 50 mph and when it slows to around 25 mph, it shakes. It is the system hitting a natural frequency.
Van said people have put a block of wood on the backside of other RV models to stop it.
I spent a considerable amount of time re-drilling my gear legs to get the exact toe-in on both sides and it did not change one thing. I have tried two different sets of tires, pressures from 25-60 psi all with no luck. My next plan, when I get to it, is to install the wheel pant spacers from PlaneAround.com and start stiffening the wheel pant to the gear. Then I will start finding a good way change the moment of inertia of the gear leg, stiffening it in the front to back direction.
I've been told by Vans not to worry about it. Just think of it as a massage with every landing.
I will find a way to eliminate it though.
Let me know if you find anything out.
Thanks, Scott
On Jan 23, 2011, at 6:40 PM, "Roger Standley" <taildragon(at)msn.com (taildragon(at)msn.com)> wrote:
href="http://www.matronics.com/Navigator?RV10-List">http://www.matronics.com/Navigator?RV10-Listhref="http://forums.matronics.com/">http://forums.matronics.com
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