I have a problem with a Shock flyer that has me totally stumped. I've not read any other reports of a similar problem. I've got a fairly typical setup, AXI 2208/34 motor, 700 mAmp Lithium battery, Hitec Feather servos. Weight about 71/2-8 oz. The problem is tremendous power/roll coupling. The plane flies straight at idle. Add a little throttle and it tends to roll left. Add 1/3 -1/2 throttle and it rolls left almost uncontrollably; only at high rates is there enough aileron authority to control the roll, and the large throws involved are almost impossible to control smoothly.
I have the Ikarus Aerofly Pro Deluxe simulator; the Shocky there has no behavior like this at any throttle setting. On the ground, I can throttle up my plane all the way without any visible problem. I tried adding some right thrust with no perceptible change; it isn't really a yaw problem anyways, it's a powerful left roll at any throttle setting above idle.
Has anyone else experienced a problem like this? Does anyone have a clue as to what the problem is? Thanks in advance for any helpful advice.

Hi James,
power-roll coupling is not a strange behaviour, also in pattern airplanes this effects arise. Your problem is the entity of this coupling!

I've never seen something so exagerate: it could be certainly reduced by reducing propeller size and pitch (other than by radio mix).
But are you sure that a roll is involved an not a YAW?

The latter case if far more explainable and has a proper solution.

What prop are you using? Try a 9x3.8 apc.

Ive got exactly the same issue with an Ikarus shocky. At full throttle its uncontrollable on the roll. Mines a 9x3.8 apc with a kms kbm31/21 motor. Im wondering if the ailerons (and rear surfaces) are too flexible and twisting in the rotating propwash.

Ive used very light 4.4g servos and also wonder if they havent the power to hold the surfaces

Any thoughts?

Windy