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Aileron correction

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docclv(at)windstream.net
Guest

Posted: Thu Oct 03, 2019 5:13 pm Post subject: Aileron correction

Guys:  I built an RV10 QB in 2010-11.  It has flown well with only a 

slight rudder trim tab.  I built another RV10 QB last year.  Got it in 

the air last February.  It had a heavy R wing on the 1st flight. 

Adjusted the flaps a little (R down and L up) a little even though the 

flaps matched the wing tip and fuselage well.  No help.  Went to Vans 

"How to Fix a Heavy Wing".  Checked the L and R ailerons as recommended 

to find out that the L aileron was 1/8 inch lower than the R.  Ordered 

new aileron hinges as listed in the Heavy Wing article only to find out 

that my 2018 kit does not have "bolt on" aileron hinges (Vans says they 

were changed in 2012).  I caller Vans and asked how to fix a heavy 

wing.  Vans recommended putting a tapered wedge on the bottom side of 

the "high wing" aileron.  Start with a wedge about 3/8 inch thick at the 

trailing edge of the aileron, taper it to nothing over about 3 inches 

and make it about a foot long to start.  Then cut its length off until 

the L aileron is pushed up enough in the slip stream to correct the 

heavy wing. After several tries, ended up with a wedge about 9 inches long.

Further flight revealed that the new 10 was 10mph slower than the old 10 

but would fly straight and level with the L aileron wedge trim.

I finally got up enough courage to do something about it.  After 

removing the aileron, I took off the trim wedge which I had made out of 

aluminum patterned after the temporary wood model, clamped fender 

washers with 3/16 inch holes on each out side of the hinge straps and 

placed the washer holes 1/8 inch below the original hinge pin holes.  I 

clamped the washers in place with small vice clamps. Using the washers 

as guides, I drilled new 3/16 inch holes in the hinge straps.  I then 

drilled (2) #43 holes across from each other in each washer and and 

hinge strap and riveted the washers in place with (2) AN470-3-2 rivets.  

I adjusted each the aileron 3/16 inch above the wing tips with the stick 

centered (airplanes fly faster with a little negative aileron).

The new 10 now flies as fast as the old one.  They indicate 183-185 mph 

in OAT 70-90 degree at 6500-7500 feet (24 squared).  We plan on 177Kts 

ground speed as Vans lists on their web site specs.

We have concluded that even though adding an aileron tab trim wedge 

corrects a heavy wing, the extra drag is significant and it is worth 

making each aileron top surface smooth with the top of the wing. Doc

- The Matronics RV10-List Email Forum -

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Kellym

Joined: 10 Jan 2006
Posts: 1706
Location: Sun Lakes AZ

Posted: Thu Oct 03, 2019 5:32 pm Post subject: Aileron correction

Very interesting. I have run into several 2 place RV's where the aileron 

hinge was mis-drilled, resulting in one end of the aileron above or 

below then wing. With those hinge brackets the most practical fix was to 

slot the holes for attachment to the wing to get the aileron flush with 

wing skin.



On 10/3/2019 6:11 PM, Doc wrote:

 	  Quote: 	
		   

 

 Guys:  I built an RV10 QB in 2010-11.  It has flown well with only a 

 slight rudder trim tab.  I built another RV10 QB last year.  Got it in 

 the air last February.  It had a heavy R wing on the 1st flight. 

 Adjusted the flaps a little (R down and L up) a little even though the 

 flaps matched the wing tip and fuselage well.  No help.  Went to Vans 

 "How to Fix a Heavy Wing".  Checked the L and R ailerons as recommended 

 to find out that the L aileron was 1/8 inch lower than the R.  Ordered 

 new aileron hinges as listed in the Heavy Wing article only to find out 

 that my 2018 kit does not have "bolt on" aileron hinges (Vans says they 

 were changed in 2012).  I caller Vans and asked how to fix a heavy 

 wing.  Vans recommended putting a tapered wedge on the bottom side of 

 the "high wing" aileron.  Start with a wedge about 3/8 inch thick at the 

 trailing edge of the aileron, taper it to nothing over about 3 inches 

 and make it about a foot long to start.  Then cut its length off until 

 the L aileron is pushed up enough in the slip stream to correct the 

 heavy wing. After several tries, ended up with a wedge about 9 inches long.

 Further flight revealed that the new 10 was 10mph slower than the old 10 

 but would fly straight and level with the L aileron wedge trim.

 I finally got up enough courage to do something about it.  After 

 removing the aileron, I took off the trim wedge which I had made out of 

 aluminum patterned after the temporary wood model, clamped fender 

 washers with 3/16 inch holes on each out side of the hinge straps and 

 placed the washer holes 1/8 inch below the original hinge pin holes.  I 

 clamped the washers in place with small vice clamps. Using the washers 

 as guides, I drilled new 3/16 inch holes in the hinge straps.  I then 

 drilled (2) #43 holes across from each other in each washer and and 

 hinge strap and riveted the washers in place with (2) AN470-3-2 rivets. 

 I adjusted each the aileron 3/16 inch above the wing tips with the stick 

 centered (airplanes fly faster with a little negative aileron).

 The new 10 now flies as fast as the old one.  They indicate 183-185 mph 

 in OAT 70-90 degree at 6500-7500 feet (24 squared).  We plan on 177Kts 

 ground speed as Vans lists on their web site specs.

 We have concluded that even though adding an aileron tab trim wedge 

 corrects a heavy wing, the extra drag is significant and it is worth 

 making each aileron top surface smooth with the top of the wing. Doc

- 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

_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD

philperry9

Joined: 23 Nov 2011
Posts: 381

Posted: Thu Oct 03, 2019 5:32 pm Post subject: Aileron correction

Do you have any before and after photos, perhaps with a straight edge that shows the drop?



Phil Perry, EAA Lifetime #834284

President, EAA Chapter 59 - Waco, Texas

EAA—The Spirit of Aviation



[quote] On Oct 3, 2019, at 8:11 PM, Doc <docclv(at)windstream.net> wrote:

 

 

 

 Guys:  I built an RV10 QB in 2010-11.  It has flown well with only a slight rudder trim tab.  I built another RV10 QB last year.  Got it in the air last February.  It had a heavy R wing on the 1st flight. Adjusted the flaps a little (R down and L up) a little even though the flaps matched the wing tip and fuselage well.  No help.  Went to Vans "How to Fix a Heavy Wing".  Checked the L and R ailerons as recommended to find out that the L aileron was 1/8 inch lower than the R.  Ordered new aileron hinges as listed in the Heavy Wing article only to find out that my 2018 kit does not have "bolt on" aileron hinges (Vans says they were changed in 2012).  I caller Vans and asked how to fix a heavy wing.  Vans recommended putting a tapered wedge on the bottom side of the "high wing" aileron.  Start with a wedge about 3/8 inch thick at the trailing edge of the aileron, taper it to nothing over about 3 inches and make it about a foot long to start.  Then cut its length off until the L aileron is pushed up enough in the slip stream to correct the heavy wing. After several tries, ended up with a wedge about 9 inches long.

 Further flight revealed that the new 10 was 10mph slower than the old 10 but would fly straight and level with the L aileron wedge trim.

 I finally got up enough courage to do something about it.  After removing the aileron, I took off the trim wedge which I had made out of aluminum patterned after the temporary wood model, clamped fender washers with 3/16 inch holes on each out side of the hinge straps and placed the washer holes 1/8 inch below the original hinge pin holes.  I clamped the washers in place with small vice clamps. Using the washers as guides, I drilled new 3/16 inch holes in the hinge straps.  I then drilled (2) #43 holes across from each other in each washer and and hinge strap and riveted the washers in place with (2) AN470-3-2 rivets.  I adjusted each the aileron 3/16 inch above the wing tips with the stick centered (airplanes fly faster with a little negative aileron)

- 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

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