The 350 is a low volt motor and won't take a 3pack with a smile. It might give you a smile in terms of performance but not with life. You'll want to go with brushless for that. I run my plane with a GWS 350 and a KAN650 and am fine with it. I'm going to go with a Himax 2015-5400 and stay with the Kan 650. I've got lots of those...