as you can see from the pic its layout is kinda conventional, the engine rotates by a retract servo but that part is all under control.

I need the engine to be mounted about 2 inches backward so it can swivel without hitting anything.Only problem is, seeing as its like a heli the engine has to be directly over the CG point. Now, i'm wondering if for eg, you made the tail smaller, then the CG point would move backwards too. I don't mean as in ballast, but as in the centre of lift.

Another eg, take a bog standard trainer, high wing set-up. Now the CG point is roughly a 1/3 of the wing chord. If Made the tail smaller/bigger, then would you have to change the C of G by ballast because the centre of lift is now different.

Or if you made a new set of wings for the trainer, swept back wings, the centre of lift would be furthur back so the CG point would be furthur back

Hope this helps, if not i don't know what else to say [sm=confused.gif]