ORIGINAL: Ed Cregger
Once broken-in and set up properly, your .72 will have a difficult time matching the Enya 80-4C (really a .74). Your .72 is much lighter and more compact and that is an advantage. But when it comes to producing power, the Enya is going to be tough to beat. Especially if your friend uses a 13x6 prop. It will pull a 14x6, but it really shines on the 13x6. Mine would pull my CGM Cub with the full size wing well enough to climb in knife-edge. The Enya 80-4C is a strong engine, but it is a little on the heavy side.
Ed Cregger
Thanks Ed, that helps a lot in deciding what we'll do with it. I was thinking a .46 size Cub or Decathlon might be a nice match, recognizing of course that the ideal Cg might need the battery somewhere in the trunk. The idea is a light sport aerobat, as he is a good flier but wants seomthing with medium aero capability and nice manners as he has not done much aerobatics to date. He seems fine on my Pizazz, so I don't see much of a problem.
The Saito .72 works best on the 13-6 too, at least on my Pizazz which although a great horsing around aerobatic airplane is IMHO between 1/2 and 1 pound too heavy for it's size. But it is loads of fun, and the .72 will pull it vertically indefinitely, albeit not too fast.
Cheers,
MJD