Hi Guys,

Just wondering what the reason is that the aileron throws on my J3Cub need to have a longer travel up than they do down,?
What affect does this have to the flight characteristics and is it absolutaly required,?

I will have to try and set it up using servo horn neutral position as my ailerons are on a "Y" harness,

Thanks,Paul

Paul,

Absolutely necessary: No. Beneficial: Yes. This is called differential travel. The longer up stroke does two things for you. One, it reduces the tendency toward adverse yaw (pointing of the nose in the opposite direction of the intended turn). It also reduces the chance of tip stalling at high angles of attack (low flight speeds). You can easily do it mechanically if you have a 2 servo set up by locating the servo arm angled out away from the aileron when setting up the control rod. With a single servo you can do the same thing, it is just a bit more tricky.

Clear?

Bedford

what beepee said is true and on the money..think of it this way...when ailerons are deflected upward part of the ailerons are hidden behind the curvature of the wing..while the other aileron is down and is more exposed to airflow..more drag on the down aileron than the up aileron causing the nose to yaw away from the turn..adverse yaw...

That's exactly how the instructions fo my MiniMag told me to do it if you didn't have a computerised radio that you could put differential into !!!
Link to their instructions here http://www.multiplex-rc.de/cms/vorsc...mag_v2_5sp.pdf

Thanks guys,
I never thought of the wing curvature,
My cubs wings are totally flat underneath with a fairly high curve on top,
Sorry I havent used the technical explanations of the wing shape,

I am considering removing the "Y" harness and running the aileron servos separately as I have the spektrum 6 computer radio and have finally mastered the programmimg of that,


Cheers,Paul