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Aileron correction

 
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docclv(at)windstream.net
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PostPosted: Thu Oct 03, 2019 5:13 pm    Post subject: Aileron correction Reply with 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


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Kellym



Joined: 10 Jan 2006
Posts: 1623
Location: Sun Lakes AZ

PostPosted: Thu Oct 03, 2019 5:32 pm    Post subject: Aileron correction Reply with quote

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





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Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD
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philperry9



Joined: 23 Nov 2011
Posts: 360

PostPosted: Thu Oct 03, 2019 5:32 pm    Post subject: Aileron correction Reply with quote

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)


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