VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics

  #1  
Old 01-18-2020, 11:17 AM
lr172 lr172 is offline
 
Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 4,559
Default Leg Fairing Alignment

I put my main wheel pants and leg fairings on before the last flight. Nose gear leg fairing has been on for some time (no impact on yaw). Before I did that, the ball was about an 1/8 out to the right. After the fairings, the ball was about a 1/4 or so out to the right. Interestingly, the plane listed to the right several degrees and would level out after stepping on the rudder and centering the ball, so likely it is adding some additional yaw. I can't imagine the extra 12-15 knots of speed could account for the additional yaw, though I really have no idea.

Curious for some opinions on possible remediation. Part of me thinks to just leave it and address with a rudder trim. The other part of me says maybe I pick up a knot or two by addressing it. The real question is how to address it. Do I just randomely move the leg fairings to the right to see what works? One, both, how much? It is easy to drill new holes for the lower intersection fairings, but not for the uppers. Also don't want to make it worse.

I used several strings and was pretty tight when installed, so I can't be off by much here from a tolerance stand point. Hence my concern. If it is off, I am sure it is s 1/16th or less. I also read an old post from Bob Turner, saying that he played with them quite a bit and could never address it with fairing movements.

Appreciate any input from those that have experience in this area.

Larry
__________________
N64LR
RV-6A / IO-320, Flying as of 8/2015
RV-10 in Phase I

Last edited by lr172 : 01-18-2020 at 11:37 AM.
Reply With Quote
  #2  
Old 01-18-2020, 11:29 AM
9GT's Avatar
9GT 9GT is offline
 
Join Date: Jan 2010
Location: Southern Michigan
Posts: 1,751
Default

I was very careful following Vans instructions when installing the fairings on my RV-10 and had no issues with yaw. The magic of fiberglass fairings is that you can easily plug the original screw holes and re-drill a new hole. Donít settle for anything less than perfect here.
__________________
David C.
Howell, MI

RV-9A: Under Construction.
RV-10: Completed 12/29/2013 SOLD 08/23/2016

"Donor Exempt" but donated through Dec. 2020
Reply With Quote
  #3  
Old 01-18-2020, 11:36 AM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 2,267
Default

Yep - on the RV-10 you can move the ball from slightly out left to slightly out right by how you rig the gear leg fairings - and I proved this.

Recommend your get a second set of eyeballs to make sure they are really rigged right. If you are still out one way or the other, rig them slightly out to compensate - but both the same way and same amount.

If you get to the point where the ball is exactly in the same spot with the fairings off or on (and you canít get it centered), then a simple tail trim tab, like this:


Carl
Reply With Quote
  #4  
Old 01-21-2020, 08:07 AM
lr172 lr172 is offline
 
Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 4,559
Default

Thanks for the input. Turns out that the intersection fairings were the issue. I just threw them on without complete attention to alignment, figuring I would clean them up when permanently mounted. both of the long tails on the lowers were well bent in the opposite direction of my issue. Once straightening them out, I am back to where I was without pant/fairings.

I'll get everything cleaned up and add a rudder trim as necessary.

Larry
__________________
N64LR
RV-6A / IO-320, Flying as of 8/2015
RV-10 in Phase I
Reply With Quote
  #5  
Old 01-22-2020, 11:57 AM
alcladrv alcladrv is offline
 
Join Date: Oct 2006
Location: Southeast
Posts: 540
Default

Quote:
Originally Posted by Carl Froehlich View Post
........then a simple tail trim tab, like this:


Carl
I'm having trouble figuring out what you've done. Could you post a side and/or bottom view?
Reply With Quote
  #6  
Old 01-22-2020, 12:04 PM
moosepileit moosepileit is offline
 
Join Date: Dec 2010
Location: Floyds Knobs, IN
Posts: 562
Default

He made a "Gurney flap" or "wickerbill", on the base of the tail lamp.

See wiki.
__________________
RV-6, bought from builder.
O-320, slider, carb, mags, FP
Reply With Quote
  #7  
Old 01-22-2020, 12:23 PM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 2,267
Default

Quote:
Originally Posted by alcladrv View Post
I'm having trouble figuring out what you've done. Could you post a side and/or bottom view?
Just a simple piece of 0.032 aluminum, cut to fit the tail light mount but with a tab sticking out on the needed side. A hole is cut on the middle to allow the tail light and of course the tail light mounting screws. The tab is thus sandwiched between the tail light and the rudder.

I stole this idea from someone else on VAF. It will put a ball that is touching the line or slightly over back in the center.

I would not make the tab much bigger than this. If you need a bigger tab then suggest the traditional wedge approach.

Carl
Reply With Quote
  #8  
Old 01-22-2020, 03:03 PM
alcladrv alcladrv is offline
 
Join Date: Oct 2006
Location: Southeast
Posts: 540
Default

Ok, thanks. I had just wondered if it was faired into the lower rudder fairing on the forward side.
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 10:58 AM.


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.