These look like good choices. The radial would look and sound pretty cool. The twin would probably fly it the best. Just curious, why you don't like the gassers? Going glow you'll wind up paying at least double what you would for a gas setup.

[link=http://www.osengines.com/engines/osmg1250.html]FT 300[/link]
[link=http://www.osengines.com/engines/osmg1320.html]FF-320[/link]
[link=http://www.osengines.com/engines/osmg1300.html]FR5-300[/link]