My friend built a Tiger 2. I have never had a problem with any Tiger 2's or Sky Tiger from Goldberg. This plane fly's awful. Its a 40 size plane with a TT 46 and on take off it wants to turn hard left. It is barley flyable. I've had to land this plane with all the right aileron and some right rudder. THe plane is built straight and true.
He's gone over the plans and rechecked the CG, lateral balance and engine thrust. My question is, What is causing this? I've had an expert pilot look at it and fly it. He had the same problem. He thought it was worse when you applied up elevator. Does anyone have a thought on this? Thanks for your time.

Mac

The plane isn't "built straight and true".
Something is seriously out of alignment.
And the c.g. is probably too far aft.

Thanks for your assessment "Tall Paul" Do you have any other suggestions? I sorta figured its out of alignment. However the CG is on target according to the plans.

You may revises the aligned of the fin and the axis of the engine.
Sorry by my poor english.

Thanks Angueto.. We will check that out.

I've built the Tiger 2 and Tiger 60... once the fuselage is glued up, if it's not straight, it never can be.
Check as Angueto mentioned for engine/fin fore-aft axis alignment.. a wing warp, non-zeroed surfaces...
Something must be awry.
T-2's are also notable for aileron flutter. Long skinny soft wood ailerons with a center drive are easily excited to flutter. 2 servos work better.

My first guess would be the wing halves being joined slightly out of alignment, such that the right wing is flying at a slightly high AOA than the left. Not a wing "warp", both sides could be perfectly straight, just joined together slightly off. It doesn't take much. If you have an incidence meter, or know somene who does, I'd say check the root and tip of both wings, all 4 should be the same, or at least match in left-right pairs if the wing has washout in it. Do the same with the horizonal stab. The vertical stab could be off, but frankly, that doesn't usually affect things THAT much unless its WAY off.

Thanks Montague... Sound like I could check this out too.

Mac