Gas isn’t more complicated than glow but it is different. It is helpful if you have tinkered with a weed eater or some other two-stroke engine and know how to mix gas and oil.

One area that needs different and careful attention is range checking with engine running. Spark engines can and often do create stray RF noise that may show up as glitches or failure to range check. I have been searching for a checklist and will post the address when found.

Gas engines smaller than 25cc generally suffer in the power to weight department. Actually the power to weight is much better with bigger engines but they need a big airframe. A 25 to 31cc engine will generally fly a in a 15 # or so airplane (4* 120 and giant Stinger). A 25cc engine will not fly a 25# airplane. Don’t ask how I know. A 56cc or 62cc will fly a 35# airplane in scale like manner.

Bill