RE: Why we don't see pattern planes for gas?
I too have been flying with the mvvs 26 on pipe, and while it's quite powerful, I'd say it's as good as a poorly set up 140 rx.
What we really need to see is a modern schneulre ported, rear ROTOR (not reed) rear exhaust 30-35cc Petrol engine, that's LIGHT LIGHT LIGHT! possible? Oh my word yes.
Economically viable, well that's the toughy.