The engine is developing so much torque that the trim you set is required to keep the airplane from rolling.

I wouldn't call this "too powerful", rather it's expected behaviour. My Giant UCD even with it's big surfaces & controls does the same thing...


If you trim the plane back so it doesn't roll on the downline, it WILL roll as you run the engine up.


A few things you can do...

- Use a smaller prop with a higher pitch. This will produce more airspeed but less torque. ( you may not like/want this... )
- Use your radio mixing to add a bit of aileron as you run up the throttle.

The latter is probably the easiest if you have a computer controlled TX...

Set a mix so that about 6-8% "mix" is added to the aileron, from the throttle.

In other words, as you run up the throttle the ailerons move to compensate for the torque.

Ideally at 100% throttle you end up with the ailerons as you have them now for level flight ( or so ).

To get it right, you need to establish a neutral point first...

So, take your plane high again, and do exactly as you did before ( you'll need to work quickly of course ).

But this time adjust the trim so that the plane DOES NOT roll on it's way down.

That's your "neutral" position.

Your mixing should be set so that with the throttle at idle ( or even maybe below 30% or so ) the ailerons are at this neutral position.

As you move the throttle stick beyond this, you want the ailerons to move to compensate for the engine torque, effectively keeping the plane level.

This is going to have many positive effects, e.g. loops will flatten out, hovering will be easier, etc.

You'll have to play with the mixing "curve" ( actually it's usually a line..).

Until you have the mix dialed in, leave it activated via a switch.

That is, you want to be able to turn it on and off in flight... just to play it safe.

Once you found the perfect setting, leave it on all the time.