Well I'll be damned. I am surprised to see someone other than myself questioning the merits of "right thrust"!

I have built many planes, and assembled several ARFs, and have never built in "right thrust", and am constantly annoyed at having to make the plywood shim to remove this "right thrust" from my ARFs.

Consider the engine thrust line, and you will realize that even with "right thrust", you still have torque... It's simply no longer along the centerline of the aircraft, but acting upon a different axis unparallel to the aircraft's centerline.

I prefer my models to have a centered engine, and compensate for any torque with control surface trims. I have never had any bad experience with neutral thrust in quite a variety of aircraft.

I don't mean to raise any hackles here, but I think "right and down" engine thrust is unnecessary on most aircraft.

Dave