RE: GP ultimate bipe power setup
I would consider a Saito 91.It is a lot lighter than a 60 2 stroke.
You can pull out of a hover.The airframe can be lightened a lot.It is way overbuilt in the fuse.
I used 1 high torque servo for all the ailerons and it is extremely sensitive on 3d rates and no sign of flutter flying around full throttle.
Here is a pic of mine.It is a very well behaved plane at all speeds.