MVVS 2.15 for gas. Although Morris has a Mark 1.80 gas that supposed to spin a prop as fast as the MVVS 2.15.

Have you talked to Robert at Morris? He sells a lot of engines for OMP planes and knows exactly what you need. Give him a call and just tell him what is the best setup he's got right now. He's an ace with these motors and he has the best selection of motors for planes that fit OMP birds. Nice guy too!

www.morrishobbies.com