RE: U CAN DO 3D 46
as long as you bolt em on right either will stay on there.
the 61 will be more fun. and give more power to pull out of a hover.
theres a long thread on this plane most people put BIG 4strokes on this plane. i had Thunder tiger .61 on mine and really enjoyed itnever tried it with anything else.
the 61 will fit with the stock mount