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Old 03-05-2018, 12:06 AM
444TX 444TX is offline
Join Date: Dec 2005
Posts: 115

While I do not have as much different RV time as Paul, I have flown more than a few and agree to look at the aileron shape. My 8 has firm aileron stick forces with flat control surfaces. Several others I have flown had overly light stick forces with under bent, convex, control surfaces.

The thin control surfaces on the 3 can be easily overbent convex or bent with a smaller than ideal trailing edge radius. Would be worth a close look. In my opinion.

George Meketa
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Old 03-05-2018, 02:42 PM
TeamFAS TeamFAS is offline
Join Date: Apr 2012
Location: Warrensburg, MO
Posts: 45

It took me a white to realize it, but at the bottom of each page you can set the number of threads displayed to "Beginning" and that will show you more threads. You'll find many many more topics on different matters. Here is a thread on the same topic with tried and true updates.
Keith S.
1981 RV-3 bought 1/2017. O-320 AvMap Ultra.
2018 Dues Paid.
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Old 03-11-2018, 04:10 PM
heinz heinz is offline
Join Date: Sep 2010
Location: comox bc
Posts: 49
Default Heavy aileron input

My RV3B also has heavier ailerons then some other RVs I have flown. RV3 RV4 RV6 RV7 RV8 RV9 and RV10. My ailerons are built to plan and are neither convex nor concave and fair evenly onto the bottom and top wing skins. I have compared the early RV3 aileron bell crank to the RV3B bell crank and they have the same ratio. I agree that the trailing edge shape can be used to trim wing heaviness in either direction. To lighten the stick forces some what I have welded in a bushing just bellow the original which has reduced the pivot to aileron push rod distance from 3 1/2 to about 3 1/8 inches. One possible explanation I might try to quantify is the speed of my airplane. It has a 160 HP 0-320 and wide open at sea level it will do 222 mph. I normally cruise at at 2550 RPM resulting in 190 mph average ground speeds. I tend to do aeros at cruise speeds and obviously speed has an effect on control forces.
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Old 03-25-2018, 01:42 AM
CAVU Mark CAVU Mark is offline
Join Date: Dec 2014
Location: San Diego, CA
Posts: 88
Default Heinz

I need to know the prop you are using and the empty weight of your plane. My 3 needs to go as fast as yours!

RV-3 restored
Stearman - built - waiting on FAA and DAR
L3 building for San Diego Air and Space Museum
Helio Courier constructing
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Old 03-25-2018, 09:29 AM
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Ironflight Ironflight is offline
VAF Moderator / Line Boy
Join Date: Jan 2005
Location: Dayton, NV
Posts: 11,740

Originally Posted by CAVU Mark View Post
I need to know the prop you are using and the empty weight of your plane. My 3 needs to go as fast as yours!
I donít know, and canít speak for, Heinz, but in Phase 1 testing we also got 193 knots (which is 222 mph) in level flight, at zero MSL, wide open and best power. Prop is a Whirlwind 151 three-blade constant speed. IO-320 by Mattituck.

Of course, that is 8 knots over airframe redline, so we havenít repeated that run!
Paul F. Dye
Editor in Chief - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)
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Old 03-25-2018, 02:32 PM
jrs14855 jrs14855 is offline
Join Date: Apr 2008
Location: Lake Havasu City AZ
Posts: 2,154
Default Forces

Barnaby Wainfan wrote an excellent article on this and much more in Kitplanes. This was some time ago and I don't have the exact date,
On some non RV airplanes if you bulge the trailing edge out too much is will completely take away the centering force.
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