Re: model airplane engine?
Yep, that would do it. People are putting those on the Bike Motor Parts kit. I think there is also some other kit you could get to use a chain drive, but I bet its high$
The guy in #1 said he didn't want a "big heavy" engine, so he probably doesn't need 4 hp and all the noise either.
Lets just try to get him on a motorized bicycle at all first.