VansAirForceForums  
Home > VansAirForceForums

-POSTING RULES
-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.


Go Back   VAF Forums > Main > RV General Discussion/News
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 10-29-2014, 02:34 PM
scott08 scott08 is offline
 
Join Date: Sep 2014
Location: Valparaiso, IN
Posts: 71
Default My RV-8A has a heavy wing (Yes another one, But with Pictures!)

So my RV 8A has a left heavy wing. I have read all of the posts about previous heavy wings, I just want to be sure I am taking the correct course of action.

The Facts:
  • Left wing is heavy, evens out after about 45-1 hour worth of flight or approximately 8 gallons.
  • The Aileron is deflected to offset the heavy wing by about 0.5" at the far edge during cruise. If I level the aileron to be even with the flap and the wing tip on both sides, it rolls pretty significantly. Ailerons are even on both sides if level with wing tip and flap. Meaning I don't have a high and a low one with relation to the flap or wingtip.
  • Ball is pretty centered in the cage, maybe a slight right hand bias, but not much.

The Plan:
  • Take Current Aileron brackets, both inboard and outboard and slot them appoximately 1/8".
  • Move brackets to the projected position to even out the aileron forces and hopefully remove some of the heavyness.
  • Measure the amount of bracket movement required to neutralize the heavy wing, and drill the blank brackets I purchased for finalization.

The questions I have are:
Do you move both the inner and outter bracket?
If I move the aileron with relation to the chord of the wing, will that stop the aileron deflection required to keep the heavy wing up? What is the best way to measure this?
Which aileron do I adjust? Heavy or light side?

Thanks,
Scott

Reply With Quote
  #2  
Old 10-29-2014, 03:04 PM
RKellogg RKellogg is offline
 
Join Date: Oct 2009
Location: Newark, IL
Posts: 287
Arrow Which wing... ??

Scott, I think your photos show the top surface of the right wing, with the right aileron deflected downward... doesn't this mean that the RIGHT wing is heavy and requires additional lift to level the wings? Did the images get reversed/mirrored?
- Roger
Reply With Quote
  #3  
Old 10-29-2014, 03:08 PM
RKellogg RKellogg is offline
 
Join Date: Oct 2009
Location: Newark, IL
Posts: 287
Arrow

Scott, does the amount of aileron unbalance required to maintain level flight remain constant as airspeed changes?
- Roger
Reply With Quote
  #4  
Old 10-29-2014, 03:19 PM
akarmy's Avatar
akarmy akarmy is offline
 
Join Date: Jan 2005
Location: Auburn, WA
Posts: 681
Default

Hey Scott, have you checked the trailing edges of all your surfaces for proper bend as a first step?

https://www.vansaircraft.com/pdf/rev..._Section-5.pdf

Section 5.7 shows an easy way to both check it and correct it. That may help your situation before you have to slot the mounting points (which you still may need to do if everything else checks out).
__________________
Andy Karmy
Covington WA

RV-8 - Flying!
RV-9A - sold

Dec 2021 Paid
Reply With Quote
  #5  
Old 10-29-2014, 03:33 PM
boomer's Avatar
boomer boomer is offline
 
Join Date: Apr 2007
Location: Ladonia,Tx
Posts: 153
Default

Quote:
Originally Posted by scott08 View Post
So my RV 8A has a left heavy wing. I have read all of the posts about previous heavy wings, I just want to be sure I am taking the correct course of action.

I had a similar problem with my -8 and religiously followed the Vans heavy wing instruction from their web site. Recommend you do the same before doing anything else. Took a number of flights, but it worked.

-John
__________________
John Banister
RV-8 Engine (IO-360), Prop (CS)
Flying Since Aug, 2011
2017 Dues Paid
Reply With Quote
  #6  
Old 10-29-2014, 04:44 PM
RKellogg RKellogg is offline
 
Join Date: Oct 2009
Location: Newark, IL
Posts: 287
Talking

Scott, don't suppose you could fly it from the passenger's seat... I fly a -7A.... A passenger is worth about 8 gallons of fuel, by my calculations.
Reply With Quote
  #7  
Old 10-29-2014, 04:55 PM
scott08 scott08 is offline
 
Join Date: Sep 2014
Location: Valparaiso, IN
Posts: 71
Default

I will check the trailing edges, I didn't see that before.

It's funny you pointed that out. The left wing is heavy, and the left aileron is deflected up, you are seeing that correctly. The right aileron is deflected down.

The builder did mention one of the wings was not mounted perfectly. Could this be a side effect of that?
Reply With Quote
  #8  
Old 10-29-2014, 08:50 PM
RVG8tor's Avatar
RVG8tor RVG8tor is offline
 
Join Date: Mar 2007
Location: McKinney, TX
Posts: 1,266
Default Use the guide

As others have said use the guide. I did get to the outer aileron hinge and found that it sat a bit high, I slotted and lowered and all was good with the wings.

I talked about how I found the high hinge in this thread.

http://www.vansairforce.com/communit...5&postcount=14

Also find a local builder, repeat offender if possible, they can be a big help.

Cheers
__________________
Mike "Nemo" Elliott
RV-8A (First Flight 12-12-12!)
KOCF
N800ME
www.mykitlog.com/rvg8tor


Dues Paid 2021
Reply With Quote
  #9  
Old 10-29-2014, 08:56 PM
scott08 scott08 is offline
 
Join Date: Sep 2014
Location: Valparaiso, IN
Posts: 71
Default

Very helpful post Mr. nemo.
Reply With Quote
  #10  
Old 10-30-2014, 12:41 AM
petersb petersb is offline
 
Join Date: Mar 2008
Location: Toronto
Posts: 328
Default

Quote:
Originally Posted by akarmy View Post
Hey Scott, have you checked the trailing edges of all your surfaces for proper bend

Section 5.7 shows an easy way to both check it and correct it. That may help your situation before you have to slot the mounting points (which you still may need to do if everything else checks out).
Scott

I have a similar situation, my thoughts are, changes to trailing edge radius and vertical movement of hinge will only make the aileron fly in a different position.

In your case you need more lift on one wing while the aileron is neutral, adjustments described above will only allow the ailerons to fly in their current displaced positions without trim pressure.
__________________
RV7A New Dec 2013 - 360, C/S, slider
RV6 - 1600 Hours ---- Sold
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 08:54 PM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.