Samolot - a few of my friends have moved to small gassers like the G20, from what I see its great for scale planes. The fuel savings is amazing for sure but then it lacks in the power that you can get from a glow equivalent. E.g. the G20 will turn a 15x6 @ 9,500 and if its a 16x6 I am guessing about 9,000 RPM. If you have a nice scale warbird etc then its a great option as you want that extra weight up front.

A glow like the 91FX will turn a 15x6 @ about 9,750RPM, a SA100 will turn a 15x6 @ 10,000 RPM and the YS110 a 16x6 @ 10,000 RPM. The glow engines are like only 91 FX and SA100 about 21 oz and the YS110 27 oz. The G20 is like no less than 35-37 oz with the battery and ignition unit.

My friend worked out a table on the running cost and despite gassers being relatively more expensive on a 160 sized gasser you make the difference back in about 9 months if you do about 6 flights a week. Well, that is the cost for us here in Malaysia.

Guess each engine serves its own purpose ... depends on what you want it for.