DIY FT Simple Cub

[Marzipan]

Hey my cub turn left hard and mine was in ZERO wind. Did you manage to fix it? What did you do to fix it?

that sounds like you need to do some trim. check your rudder, elevators, ailerons and make sure they're centered.

 

[RossFPV]

They are all perfectly straight but the elevator was bent so it was giving it left roll

 

[RossFPV]

I also just read that someone used a 8x4.7 prop and that reduced the left turn problem so if this doesnt fix it i might try that.

 

[FrenchBaguette]

Hi, this is exactly how I fixed my problem. I was using 8x6 propeller and I replaced it with a 9x5 and the left roll disappeared and she now flies smoothly.
I also kept my 2" thrust angle.
My built is a full depron instead of foamboard, so it is slightly lighter, so I imagine it is more sensitive to torque.
I also avoid full throttle during launching.
Hope this will help

 

[RossFPV]

that makes me a little confused because i was using a 9x4.5, and by 2” thrust angle do you mean you you added thrust angle to it?

 

[FrenchBaguette]

I added 2 degrees of thrust angle to the engine (not the propeller ;-) ) by adding washers on the left side.
For the propeller I figured out that a higher pitch results in a higher torque (I may be wrong, but it seemed to work for me). In that case the length (8" vs 9") does not seem to have any impact.

 

[RossFPV]

Ok thank you for all the help 👍