[sdiy] OT BLDC motor controller - a MOSFET question

[Tom Adam]

Sorry for this OT question...

A nephew of mine is working on his thesis and is having a problem.
He's building a brushless DC motor controller with an arduino. He's got 
a working prototype, so far so good.
For his prototype he's using a 25W BLDC motor, but in the end he needs 
to drive an 800W BLDC motor (36V, +/-22A).
Currently  he's using the IRF1205(N) & IRF5305 (P) MOSFET. And we're not 
sure these MOSFETS can handle the 800W motor.
So how does one select a MOSFET? Any pointers appreciated...

Thanks
ToAd