Well,
i had an OS 46 LA on my Avistar and it was good.
BUT,
for a UCanDo 46 it's NOT.
I fly mine with an OS 91FX and i couldn't ask better.
Power?
Well,
that makes me laugh.
I take off at 2/3 of throttle and immediately i hover with less throttle.!
Rolls,
knife edges,
stall turns,
spins,
inverted flights,
cuban eight's,
walls etc are
PERFECT!!!!!!!!!!!!!
Go with a bigger engine.
Go with a 91!