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Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 25203
Location: Livermore CA USA
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 Posted: Thu Mar 31, 2011 8:49 am Post subject: Heavy Right Wing... |
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Dear Listers,
Well, taking the RV-8 in for paint is getting closer and closer and I'm trying to get all the little things that need doing done before then. Dealing with the heavy right wing is the next thing on the list. Currently, at low speed I have about neutral aileron trim. The faster I go, the more LEFT trim I need. Above 200mph, I run out of left trim and the left aileron is noticeably "up", maybe .125" or so. Both of my ailerons are "chubby" at the trailing edge. I wanted to confirm with the List that "squeezing" the RIGHT aileron will add a bit of lift on the RIGHT side and hopefully neutralize the issue?
Thanks!
Matt
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Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's RV-8 Construction Log
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
Status: 160+ Hours TTSN - Paint job is all that's left...
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Matt Dralle
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recapen(at)earthlink.net
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| Posted: Thu Mar 31, 2011 9:49 am Post subject: Heavy Right Wing... |
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Before you squeeze either, take your airfoil template and make sure the leading edge of the aileron isn't sticking up in to the airstream. Mine was by just a little bit. I reset the aileron and haven't found the need to squeeze....
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burnsm(at)suddenlink.net
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| Posted: Thu Mar 31, 2011 11:04 am Post subject: Heavy Right Wing... |
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I did the same thing as Ralph. It worked.
Sent via DROID on Verizon Wireless
-----Original message-----
From: "Ralph E. Capen" <recapen(at)earthlink.net>
To: rv-list(at)matronics.com
Sent: Thu, Mar 31, 2011 16:48:32 GMT+00:00
Subject: Re: Heavy Right Wing...
Before you squeeze either, take your airfoil template and make sure the
leading edge of the aileron isn't sticking up in to the airstream. Mine was
by just a little bit. I reset the aileron and haven't found the need to
squeeze....
--
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Michael Wynn
Joined: 10 Jan 2006
Posts: 148
Location: San Ramon, CA
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| Posted: Thu Mar 31, 2011 11:14 am Post subject: Heavy Right Wing... |
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Hey Matt,
When I sent in my pledge, I got a great book called something like Airplane Rigging. It was an excellent read and a reference I plan to return to when I actually get my bird airborn. I am certainly no expert in this, but reviewing that book might give you some really good ideas.
I wonder what is happening to your slip indicator as the airspeed goes up. Is the airplane going straight? If the issue is in yaw and is getting compensated by roll, then the aileron is probably not the place to start. If the issue is the prop wash affecting the wing ( I can't remember from the book which roll this affects) then I think they said something about changing the angle the engine sits (washer under the motor mount).
I am probably just broadcasting my ignorance here, but I thought I would mention what a great book it was and how much it helped my understanding of the complexities of the rigging process.
Good luck and let us know how this comes out.
Regards,
Michael Wynn
RV 8 Wiring
San Ramon, CA
In a message dated 3/31/2011 10:11:52 A.M. Pacific Daylight Time, dralle(at)matronics.com writes:
| Quote: | [img]res://C:\Program Files\Nuance\NaturallySpeaking10\Program\web_ie.dll/QMARK.GIF[/img][img]res://C:\Program Files\Nuance\NaturallySpeaking10\Program\web_ie.dll/ARROW.GIF[/img]--> RV-List message posted by: Matt Dralle <dralle(at)matronics.com>
Dear Listers,
Well, taking the RV-8 in for paint is getting closer and closer and I'm trying to get all the little things that need doing done before then. Dealing with the heavy right wing is the next thing on the list. Currently, at low speed I have about neutral aileron trim. The faster I go, the more LEFT trim I need. Above 200mph, I run out of left trim and the left aileron is noticeably "up", maybe .125" or so. Both of my ailerons are "chubby" at the trailing edge. I wanted to confirm with the List that "squeezing" the RIGHT aileron will add a bit of lift on the RIGHT side and hopefully neutralize the issue?
Thanks!
Matt
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Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's RV-8 Construction Log
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
Status: 160+ Hours TTSN - Paint job is all that's ======================== ties Day ================================================ - MATRONICS WEB FORUMS ================================================ - List Contribution Web Site sp; ===================================================
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[quote][b]
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Michael Wynn
RV 8
San Ramon, CA |
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denis.walsh(at)comcast.ne
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| Posted: Thu Mar 31, 2011 12:05 pm Post subject: Heavy Right Wing... |
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Matt there are lots of good pieces of advice available, and most of
what I've seen are worthwhile.
I just want to add: If you do get around to squeezing a trailing
edge, your technique is backwards. The wing whose aileron you squeeze
will become heavier.
Check everything else first.
DW
On Mar 31, 2011, at 10:10 , Matt Dralle wrote:
| Quote: |
Dear Listers,
Well, taking the RV-8 in for paint is getting closer and closer and
I'm trying to get all the little things that need doing done before
then. Dealing with the heavy right wing is the next thing on the
list. Currently, at low speed I have about neutral aileron trim.
The faster I go, the more LEFT trim I need. Above 200mph, I run out
of left trim and the left aileron is noticeably "up", maybe .125" or
so. Both of my ailerons are "chubby" at the trailing edge. I
wanted to confirm with the List that "squeezing" the RIGHT aileron
will add a bit of lift on the RIGHT side and hopefully neutralize
the issue?
Thanks!
Matt
-
Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's RV-8 Construction Log
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
Status: 160+ Hours TTSN - Paint job is all that's left...
|
| | - The Matronics RV-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?RV-List |
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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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| Posted: Thu Mar 31, 2011 2:15 pm Post subject: Heavy Right Wing... |
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Seems to be very common on 7's and 8's for the rt aileron outer hinge to
be high, allowing outer leading edge to stick up, while inner hinge is
perfect.
On 3/31/2011 9:48 AM, Ralph E. Capen wrote:
[quote]
Before you squeeze either, take your airfoil template and make sure the leading edge of the aileron isn't sticking up in to the airstream. Mine was by just a little bit. I reset the aileron and haven't found the need to squeeze....
--
| | - The Matronics RV-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?RV-List |
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Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
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khorton01(at)rogers.com
Guest
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| Posted: Thu Mar 31, 2011 4:18 pm Post subject: Heavy Right Wing... |
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On 2011-03-31, at 12:10 , Matt Dralle wrote:
| Quote: |
Dear Listers,
Well, taking the RV-8 in for paint is getting closer and closer and I'm trying to get all the little things that need doing done before then. Dealing with the heavy right wing is the next thing on the list. Currently, at low speed I have about neutral aileron trim. The faster I go, the more LEFT trim I need. Above 200mph, I run out of left trim and the left aileron is noticeably "up", maybe .125" or so. Both of my ailerons are "chubby" at the trailing edge. I wanted to confirm with the List that "squeezing" the RIGHT aileron will add a bit of lift on the RIGHT side and hopefully neutralize the issue?
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Matt,
Given that the out of trim changes so much with speed, I doubt a simple squeeze of an aileron trailing edge is the answer. You'd end up with a heavy left wing at slow speed, and a heavy right wing at high speed. Study the info that Van's has published on this before you do any squeezing.
http://www.vansaircraft.com/pdf/Wing_Heavy.pdf
I'm guessing you've either got a misrigged flap, or an aileron hinge that needs to be moved vertically.
If you do squeeze an aileron, you squeeze the one on the light wing, i.e. you'd squeeze the left one.
--
Kevin Horton
RV-8
Ottawa, Canada
http://www.kilohotel.com/rv8
| | - The Matronics RV-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?RV-List |
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Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 25203
Location: Livermore CA USA
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| Posted: Thu Mar 31, 2011 7:52 pm Post subject: Heavy Right Wing... |
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Thanks to everyone for the great feedback on this issue!!
I went out after work tonight and had a look at the aileron alignment and sure enough, the outboard edge of the right aileron was high by about 1/16-3/32 of an inch. I took the hinge off the aileron and elongated the holes slightly and reassembled, dropping the outboard side by about 1/16". I went out and took it up to about 220mph and now - are you ready for this - it requires full RIGHT trim! Completely the opposite from before. So, obviously I need to reduce the drop by 50% and I should be dead-on neutral trim! Its amazing to me how such a little movement had such a HUGE impact on the trim. No, aileron edge smooshing necessary, by the way! Whew!
Best,
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Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's RV-8 Construction Log
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
Status: 160+ Hours TTSN - Paint job is all that's left...
At 09:10 AM 3/31/2011 Thursday, Matt Dralle wrote:
| Quote: |
Dear Listers,
Well, taking the RV-8 in for paint is getting closer and closer and I'm trying to get all the little things that need doing done before then. Dealing with the heavy right wing is the next thing on the list. Currently, at low speed I have about neutral aileron trim. The faster I go, the more LEFT trim I need. Above 200mph, I run out of left trim and the left aileron is noticeably "up", maybe .125" or so. Both of my ailerons are "chubby" at the trailing edge. I wanted to confirm with the List that "squeezing" the RIGHT aileron will add a bit of lift on the RIGHT side and hopefully neutralize the issue?
Thanks!
Matt
|
| | - The Matronics RV-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?RV-List |
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Matt Dralle
Matronics Email List Administrator |
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