I have a profile running a 20 cc gas engine. While flying straight & throttle up it seams to veer a little to the left. We think that by adding a little right thrust to the engine it might straighten out. Any thoughts would be appreciated.

I'm not sure I get what you're asking, but if you're asking about a plane trying to turn left under hard acceleration, that's not something I would try to trim out. No pro here by any shape of the imagination, so it will be interesting to hear what others think.

When it come to trim on my planes, I generally stay pretty close to procedures used on other acrobatic planes, with particular emphasis in CG placement.

It doesn't turn to the left. It seems to drift. All my planes are built with a little right angle since torque pulls it to the left. the engine is mounted sideways & by adding a flat washer on the front of the engine it gives me the angle I need. Will post after I fly with it this week.

I always run a little right thrust in my 3D birds. My MOJO has about 3 degrees and it is perfect for my style. Pull a vertical upline from level at about half throttle, go full throttle as soon as you are vertical, Add right until it will accelerate vertical straight, it will start to pull a little left when you run out of acceleration.

Scott

Put some right in & it worked. Now on full throttle she tracks straight. Thanks.