ORIGINAL: joelansing
I'll second the Irvine 53, 12x6 prop, use a light weight engine mount, maybe move the battery back, and it will be a low weight, well balanced powerhouse....

- Joe
I just bought one of these. They are great engines. I use the APC 12-6 and it rocks. I actually used it on a Magic Extra 300L. Pulls that thing around no problem and it balanced real nice. Not a very heavy engine at all.
Joe
P.S. I flew yesterday and I guy from the field was watching me climb vertical to set up for a blender. He just said "wow" when I was climbing. It was getting pretty small up there.
Joe