Fantastic engine, I have one If you really want a gasser you should consider the MVVS or Evolution 26cc. They mount to your airplane just like a glow engine. I have the gas MVVS 26 too, and it has exactly the same power on a MenzS 18-6 as the ASP 180 Fs (9000 rpm) but I use a pipe on the gasser so with the Pitts muffler it would propably be a bit shy of the 180 fs. The gasser will be less expensive in the long run, although the ASP 180 Fs actually just sips the fuel when tuned correctly. When I swapped the 180 Fs for a 120 twostroke, my fuel consumtion went sky high. I only flew the 120 for a few flights and it was tuned perfect. Then I put in my MVVS gasser and it is still there (Harrier 90)