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Aileron trailing edge skislope effect

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matronics(at)cencula.com
Guest

Posted: Wed Oct 24, 2007 4:18 pm Post subject: Aileron trailing edge skislope effect

Greetings listers,



I'm working on my ailerons (RV-7A) and seem to be getting a skislope effect at 

the trailing edge near the ribs.  Some places are worse than others.  You can 

see what I mean by checking the third photo here:



http://www.our7a.com/20071015.html



or the second and third photos here:



http://www.our7a.com/20071024.html



Any thoughts on what's causing this?



It seems to like the trailing edge bend may not be in exactly the right 

location.



I sent this very question to Van's and got the following response:



"Mike,

I looked at your aileron trailing edge photo and it is not perfect, but it's 

acceptable and within tolerance.  It will not cause you any flight problems.  

Bruce Reynolds

brucer(at)vansaircraft.com"



Although it's nice to know that it's still safe, I really need a *solution*.



Thanks,



Mike Cencula

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wgill10(at)comcast.net
Guest

Posted: Wed Oct 24, 2007 6:03 pm Post subject: Aileron trailing edge skislope effect

Mike,



It couldn't hurt to order another rib for the worst ski slope end to see

if that improves the fit.



Bill

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rv7(at)b4.ca
Guest

Posted: Wed Oct 24, 2007 7:21 pm Post subject: Aileron trailing edge skislope effect

On 17:15 2007-10-24 "Michael D. Cencula" <matronics(at)cencula.com> wrote:

 	  Quote: 	
		   Although it's nice to know that it's still safe, I really need a

 *solution*.


	


Some alternatives:



1. Make a new rib for the worst location, drilling holes to match the skins.



2. Remove the clecoes from the worst rib, and drill new holes that match

the skins in the spaces between each of the existing holes.  When you get

to painting, fill the unriveted holes and then paint over them.



3. (Van's suggestion) Drive the rivets as-is, and rig the plane to fly

straight and true once you're done.



Personally I wouldn't go looking for extra work, but if pushed i'd probably

opt for option 1.



-Rob

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Dale Ensing

Joined: 11 Jan 2006
Posts: 571
Location: Aero Plantation Weddington NC

Posted: Thu Oct 25, 2007 2:22 am Post subject: Aileron trailing edge skislope effect

Mike,

The trailing edge doesn't look too bad to me. However, you really will not 

know if it causes a trim problem until you fly the airplane.  The shape can 

be perfect to the eye but  still require altering because of a "heavy wing".

Initially my 6A flew hands off perfectly until I had the plane painted. 

After checking all the alignment points of both ailerons, the gear leg 

fairing etc., only thing I found was an impression on the top of the right 

aileron midway along the trailing edge. It looked like someone in the paint 

shop picked up the aileron by the trailing edge and put a slight 

dent/depression in the top skin right where a thump would have squeezed it.



Following Van's procedure for correcting a heavy wing, 

http://www.vansaircraft.com/pdf/Wing_Heavy.pdf, I had to reduce the radius 

of the right aileron trailing edge and increase the radius of the left 

aileron trailing edge to get back to the 'hands off' trim I had before 

painting.

Dale Ensing

RV-6A

EAA TC & FA



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_________________
Dale Ensing
RV-6A
Aero Plantation
Weddington NC

Carl

Joined: 04 May 2007
Posts: 44
Location: Aiken, SC

Posted: Thu Oct 25, 2007 5:29 am Post subject: Aileron trailing edge skislope effect

I believe I have seen this issue before and it was traced to skins that were

bent wrong and Van replaced them.  You may want to check with Ken.  



Carl W Bell

New Venture Consulting

Mobile:  803.640.2760

www.newventureconsulting.com

carlbell(at)gforcecable.com

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_________________
Carl Bell
Building N947CB
RV 7A

panamared5(at)brier.net
Guest

Posted: Thu Oct 25, 2007 12:41 pm Post subject: Aileron trailing edge skislope effect

After looking at the pictures, I don't see the problem.  If this is 

all you have to be worried about, then you are building a real fine RV.



My RV has some cosmetic imperfections, dents, smiles, scratches 

whatever, now 5 years into flying, things that I thought were so 

important, I can not even find them, let alone allow it to bother me.



This is sort of in the category of "who cares?"  I would never have 

noticed without the straight edge in the picture.  If you are 

building for flying, then move on, if you are building an Award 

Winner that will be exhibited in some technical museum, keep redoing 

it until it is perfect.



If after flying the RV for a few years and it still bothers you, then 

rebuild it.  But, by then you will be having way too much fun to 

worry about cosmetic accuracy.

Bob

RV6 "Wicked Witch of the West"



At 07:15 PM 10/24/07, you wrote:

 	  Quote: 	
		  



Greetings listers,



I'm working on my ailerons (RV-7A) and seem to be getting a skislope 

effect at

the trailing edge near the ribs.  Some places are worse than others.

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matronics(at)cencula.com
Guest

Posted: Tue Nov 06, 2007 10:11 pm Post subject: Aileron trailing edge skislope effect

RV-Listers,

Thanks all for the comments and suggestions.  I thought I'd post my 

solution in case anyone runs into the same issue.  I ended up ordering 

new ribs from Vans that didn't have prepunched flanges, then match 

drilled them to the skins.  They actually gave me a break on the price, 

so all four ribs came to only about $15!

If interested, you can see how the fit compares:

Original prepunched rib: http://www.our7a.com/images/20071024-02-tn.jpg

New non-prepunched rib: http://www.our7a.com/images/20071106-04-tn.jpg

Best regards,

Mike Cencula

RV-7A wings

Bob wrote:

 	  Quote: 	

 After looking at the pictures, I don't see the problem.  If this is 

 all you have to be worried about, then you are building a real fine RV.

 My RV has some cosmetic imperfections, dents, smiles, scratches 

 whatever, now 5 years into flying, things that I thought were so 

 important, I can not even find them, let alone allow it to bother me.

 This is sort of in the category of "who cares?"  I would never have 

 noticed without the straight edge in the picture.  If you are building 

 for flying, then move on, if you are building an Award Winner that 

 will be exhibited in some technical museum, keep redoing it until it 

 is perfect.

 If after flying the RV for a few years and it still bothers you, then 

 rebuild it.  But, by then you will be having way too much fun to worry 

 about cosmetic accuracy.

 Bob

 RV6 "Wicked Witch of the West"

 At 07:15 PM 10/24/07, you wrote:

> 

> <matronics(at)cencula.com>

>

> Greetings listers,

>

> I'm working on my ailerons (RV-7A) and seem to be getting a skislope 

> effect at

> the trailing edge near the ribs.  Some places are worse than others.

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jan(at)claver.demon.co.uk
Guest

Posted: Wed Nov 07, 2007 12:23 pm Post subject: Aileron trailing edge skislope effect

You did the right thing ... !



Jan



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