Re: New, never built one, global warming inspired
A diesel motor could work. They had diesel model airplane motors when I was a little boy. Air cooled, weighed no more than a gas or model fueled motor and could swing a bigger prop than comparable sized motors. I wonder why no one has looked into a small compact diesel. Maybe they're out there but I haven't seen them.
Anyway, welcome and have fun with whatever you decide to motorize.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"