RE: How much motor to fly this?
Oh Boy all bets are off, I missed it if you you mentioned the "conversion" word. This is beginning to sound like another those great buys that just somehow does not seem practical after you bought the thing. I am betting this one may end up with a completion cost maybe three times what you are planning.
I,ve done a few Conversions Electric to Glow but no interest in the other way around at all, Sorry.
John