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Old 11-13-2007, 12:03 PM
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Johnnie Red
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Default RE: J3 cub, crash on take off nearly every time.


ORIGINAL: JPANN

Johnnie Red,
1. Left side more than right for sure. I had to fight it by giving it alot of right input, then it would snap.
2. No considerable change occured during throttle adjustments.
3. No, I never had a chance to because it liked the ground better!
4. It did not seem to matter.
5. Whatever thrust angle was built into the firewall. He did not add any more. (that's interesting however).

I hope this helps, I appologize for not having the exact answers you may be looking for. I had all of my attention on the task of trying to land and not realy on conditions etc.
Dear JPANN,

Thanks for your answer. From the answers you gave me I can think of the following.
The Left side tendency was probably from the lack of the proper right side thrust. The tendency of snaproll comes out of the throws at the elevator. (The cub has big moving tail moments so you need to trim gentle moves).
Also, it would be very helpfull if you put at your next cub 2-3deg. Down Thrust on your engine together with 2-3deg. side thrust. The plane will be tamed like this and the takeoffs will be less tricky than they are right now. Do that and you will have a perfect plane to handle.
Best regards to you and happy flights with your next Cub project
Johnnie Red