Flip 3d with Saito 72
Weights of the two engines:
Saito 72 470g, 16.5oz
YS .91 AC 750g, 26.5oz
difference 10oz, both include weight of muffler.
Man, that has to be a tight fit, but I bet the vertical is awesome!!!
The Saito 72 can pull it OK from a hover but I bet it must be a rocket with the YS!!
enjoy!!