Very good ideas. I've searched for an Ultra 120, none to be found.

I am currently flying 4 SPADS of various designs. I've pondered a 31cc Spad design, but was concerned about weight. Only a couple successful gas models on various Spad websites. A gas DPS type would be interesting. The Spad concept and gas conversions seem to be a good match.

Can't seem to find the Big Bee...will search more. The Big Stik looks like a possibility.

To conversion vets...it seems there are a variety opinions of ways to go (cc size wise)...does it make sense to start at least at 31cc with the type of planes we are discussing?