Seems the OS 50 is the motor as it is what's in my venus!
I've flown mine with a 12x8 prop.
I love this plane, it was my first real plane after my Alpha trainer.
All throws were set per instructions.
It tracks nicely, and you'll drop your jaw when you do a knife edge. It's been a hit at the field!
Geez, what else can I say about it?

Enjoy it!

~ Charles Dolan