 |
Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
|
| View previous topic :: View next topic |
| Author |
Message |
davelammers(at)mchsi.com
Guest
|
 Posted: Mon Jul 09, 2007 6:38 am Post subject: Main Landing Gear Shimmy Question |
 |
|
This question is for those who are already flying.
Have any of you experienced the RV shimmy in the main landing gear
typical of that experienced in the RV6 series? This is an occasional
shimmy (once every couple dozen landings) which occurs on landing
rollout and is induced by rolling over an irregular surface deformation
on landing rollout and generally can be stopped only by bringing the
aircraft to a full stop. I've seen in in 3 of the several RV6's I've
been involved with. Van changed the RV6 plans to add a damping piece of
wood fiberglassed to the aft surface of the gear leg, which is now the
standard configuration on the -6.
Second question: Has anyone added this to the RV10 gear legs? If so,
why? Out of experienced shimmy, or out of precaution due to experience
in other Van's tubular steel main landing gear aircraft?
My guess is that the larger diameter and mass of the RV10 gear leg has
changed the natural harmonic frequency of the leg so that this is not an
issue and the dampener is not required. However, I thought I'd poll
those of you flying, because I am at the point where adding this would
be an easy thing to do.
Thanks.
Dave Lammers
finishing
| | - 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 |
|
|
|
| Back to top |
|
 |
flysrv10(at)gmail.com
Guest
|
| Posted: Mon Jul 09, 2007 7:05 am Post subject: Main Landing Gear Shimmy Question |
|
|
I have experienced shimmy in mine (160 hrs) and have had to tighten
the large fork nut couple of times to prevent it. I suspect that the
shimmy might be due to wear at the washers. It seems that I need to
have a slight drag on the fork to eliminate shimmy. Also, holding
the stick in your lap on roll-out seems to help.
Not familiar with the fix on the -6 gear, however a picture or a part
number from Van would be nice.
Thanks,
Rob.
On Jul 9, 2007, at 10:36 AM, Dave Lammers wrote:
| Quote: |
This question is for those who are already flying.
Have any of you experienced the RV shimmy in the main landing gear
typical of that experienced in the RV6 series? This is an
occasional shimmy (once every couple dozen landings) which occurs
on landing rollout and is induced by rolling over an irregular
surface deformation on landing rollout and generally can be stopped
only by bringing the aircraft to a full stop. I've seen in in 3 of
the several RV6's I've been involved with. Van changed the RV6
plans to add a damping piece of wood fiberglassed to the aft
surface of the gear leg, which is now the standard configuration on
the -6.
Second question: Has anyone added this to the RV10 gear legs? If
so, why? Out of experienced shimmy, or out of precaution due to
experience in other Van's tubular steel main landing gear aircraft?
My guess is that the larger diameter and mass of the RV10 gear leg
has changed the natural harmonic frequency of the leg so that this
is not an issue and the dampener is not required. However, I
thought I'd poll those of you flying, because I am at the point
where adding this would be an easy thing to do.
Thanks.
Dave Lammers
finishing
|
| | - 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 |
|
|
|
| Back to top |
|
|
deutscht(at)rhwhotels.com
Guest
|
| Posted: Mon Jul 09, 2007 7:08 am Post subject: Main Landing Gear Shimmy Question |
|
|
Dave, had issue on my 7 so know what you are talking about. 100 hours
and no issue at all on my 10 and I did nothing.
Tom Deutsch
Vice President
RHW Development and Construction Services
Office 913 451-1222
Fax 913 451-6493
Cell 913 908-7752
--
| | - 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 |
|
|
|
| Back to top |
|
|
davelammers(at)mchsi.com
Guest
|
| Posted: Mon Jul 09, 2007 9:02 am Post subject: Main Landing Gear Shimmy Question |
|
|
Rob,
Thanks for your reply. However, my question only dealt with the main
landing gear (not the nose gear). The -6 fix would most likely not help
a shimmy that is due to an issue with the wheel, its mounting and axis
of rotation, as I think most nose gear shimmies are, but thanks for the
reply anyway.
Dave Lammers
finishing
Rob Kermanj wrote:
| Quote: |
I have experienced shimmy in mine (160 hrs) and have had to tighten
the large fork nut couple of times to prevent it. I suspect that the
shimmy might be due to wear at the washers. It seems that I need to
have a slight drag on the fork to eliminate shimmy. Also, holding
the stick in your lap on roll-out seems to help.
Not familiar with the fix on the -6 gear, however a picture or a part
number from Van would be nice.
Thanks,
Rob.
On Jul 9, 2007, at 10:36 AM, Dave Lammers wrote:
>
>
> This question is for those who are already flying.
>
> Have any of you experienced the RV shimmy in the main landing gear
> typical of that experienced in the RV6 series? This is an
> occasional shimmy (once every couple dozen landings) which occurs on
> landing rollout and is induced by rolling over an irregular surface
> deformation on landing rollout and generally can be stopped only by
> bringing the aircraft to a full stop. I've seen in in 3 of the
> several RV6's I've been involved with. Van changed the RV6 plans to
> add a damping piece of wood fiberglassed to the aft surface of the
> gear leg, which is now the standard configuration on the -6.
>
> Second question: Has anyone added this to the RV10 gear legs? If
> so, why? Out of experienced shimmy, or out of precaution due to
> experience in other Van's tubular steel main landing gear aircraft?
>
> My guess is that the larger diameter and mass of the RV10 gear leg
> has changed the natural harmonic frequency of the leg so that this
> is not an issue and the dampener is not required. However, I
> thought I'd poll those of you flying, because I am at the point
> where adding this would be an easy thing to do.
>
> Thanks.
> Dave Lammers
> finishing
>
---------------------------------------------------------------------------------------------------
Text inserted by Panda Platinum 2005 Internet Security:
This message has NOT been classified as spam. If it is unsolicited
mail (spam), click on the following link to reclassify it:
http://127.0.0.1:6083/Panda?ID=pav_49276&SPAM=true
---------------------------------------------------------------------------------------------------
|
| | - 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 |
|
|
|
| Back to top |
|
|
pitts_pilot(at)bellsouth.
Guest
|
| Posted: Mon Jul 09, 2007 9:08 am Post subject: Main Landing Gear Shimmy Question |
|
|
I don't really know what the configuration of the Vans nosewheel is, but
the Grummans have been living with nosewheel shimmy from day one. There
are belleville (cupped) washers stacked to give some drag to the
nosewheel to prevent shimmy. The nut is tight enough when it takes a 25
Lb pull at the wheel axle to move the nosewheel sideways. It may work
on the -10 too.
Linn
do not archive
Rob Kermanj wrote:
| Quote: |
I have experienced shimmy in mine (160 hrs) and have had to tighten
the large fork nut couple of times to prevent it. I suspect that the
shimmy might be due to wear at the washers. It seems that I need to
have a slight drag on the fork to eliminate shimmy. Also, holding
the stick in your lap on roll-out seems to help.
Not familiar with the fix on the -6 gear, however a picture or a part
number from Van would be nice.
Thanks,
Rob.
On Jul 9, 2007, at 10:36 AM, Dave Lammers wrote:
>
>
> This question is for those who are already flying.
>
> Have any of you experienced the RV shimmy in the main landing gear
> typical of that experienced in the RV6 series? This is an
> occasional shimmy (once every couple dozen landings) which occurs on
> landing rollout and is induced by rolling over an irregular surface
> deformation on landing rollout and generally can be stopped only by
> bringing the aircraft to a full stop. I've seen in in 3 of the
> several RV6's I've been involved with. Van changed the RV6 plans to
> add a damping piece of wood fiberglassed to the aft surface of the
> gear leg, which is now the standard configuration on the -6.
>
> Second question: Has anyone added this to the RV10 gear legs? If
> so, why? Out of experienced shimmy, or out of precaution due to
> experience in other Van's tubular steel main landing gear aircraft?
>
> My guess is that the larger diameter and mass of the RV10 gear leg
> has changed the natural harmonic frequency of the leg so that this
> is not an issue and the dampener is not required. However, I
> thought I'd poll those of you flying, because I am at the point
> where adding this would be an easy thing to do.
>
> Thanks.
> Dave Lammers
> finishing
>
|
| | - 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 |
|
|
|
| Back to top |
|
|
pitts_pilot(at)bellsouth.
Guest
|
| Posted: Mon Jul 09, 2007 9:36 am Post subject: Main Landing Gear Shimmy Question |
|
|
I'm glad I'm not the only one that read Dave Lammers email too quickly!
Sorry. I picked up on the 'shimmy' part. The one thing I hate about the
tubular gear is the 'walking' the gear does fore and aft. Looking at it
waving back just gives me the willies. So much so that I've given some
thought to a spring aluminum gear. I keep running into obstacles
(weight and positioning) that point to making the switch almost
impossible. I'm almost resigned to 'live with it' like all the other
thousands of RV owners seem to be doing. Has anyone else done any
thinking on making a switch???
Linn
linn Walters wrote:
| Quote: |
I don't really know what the configuration of the Vans nosewheel is,
but the Grummans have been living with nosewheel shimmy from day one.
There are belleville (cupped) washers stacked to give some drag to the
nosewheel to prevent shimmy. The nut is tight enough when it takes a
25 Lb pull at the wheel axle to move the nosewheel sideways. It may
work on the -10 too.
Linn
do not archive
Rob Kermanj wrote:
>
>
> I have experienced shimmy in mine (160 hrs) and have had to tighten
> the large fork nut couple of times to prevent it. I suspect that
> the shimmy might be due to wear at the washers. It seems that I
> need to have a slight drag on the fork to eliminate shimmy. Also,
> holding the stick in your lap on roll-out seems to help.
>
> Not familiar with the fix on the -6 gear, however a picture or a
> part number from Van would be nice.
>
> Thanks,
> Rob.
>
> On Jul 9, 2007, at 10:36 AM, Dave Lammers wrote:
>
>>
>>
>> This question is for those who are already flying.
>>
>> Have any of you experienced the RV shimmy in the main landing gear
>> typical of that experienced in the RV6 series? This is an
>> occasional shimmy (once every couple dozen landings) which occurs
>> on landing rollout and is induced by rolling over an irregular
>> surface deformation on landing rollout and generally can be stopped
>> only by bringing the aircraft to a full stop. I've seen in in 3 of
>> the several RV6's I've been involved with. Van changed the RV6
>> plans to add a damping piece of wood fiberglassed to the aft
>> surface of the gear leg, which is now the standard configuration on
>> the -6.
>>
>> Second question: Has anyone added this to the RV10 gear legs? If
>> so, why? Out of experienced shimmy, or out of precaution due to
>> experience in other Van's tubular steel main landing gear aircraft?
>>
>> My guess is that the larger diameter and mass of the RV10 gear leg
>> has changed the natural harmonic frequency of the leg so that this
>> is not an issue and the dampener is not required. However, I
>> thought I'd poll those of you flying, because I am at the point
>> where adding this would be an easy thing to do.
>>
>> Thanks.
>> Dave Lammers
>> finishing
>>
>>
>>
>>
>>
|
| | - 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 |
|
|
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
