Greetings,

The ST90 would be OK, check your ground clearance on the prop. I used th fly with a Webra Speed and Zinger 10 1/2 X 7 1/2, I think. If you really want to know, I will go to the "Wall" and look.

As far as the balance point, I was never sophisticated enough to study it. If it flew OK it was OK. Ask Grotto2 about that, he knows all that stuff.

Servos? Put 2 in the wing and spend all you can on std size coreless double ball bearing ,and, if you really feel flush, digital.

There again, Grotto2 can provide more details.

Good Luck,
AW