Originally Posted by
rgburrill
While indeed a 20cc gas is roughly equivalent to a 1.2ci fuel, I believe the fuel equivalent is a 4 stroke not a 2 stroke. If that is true then the 20CC gas is, power wise, equivalent to a .90ci 2 stroke.
I'm sure someone will correct me if I am wrong,
20cc = 1.22 ci. My .91 Magnum 2 stroke turns a 15X6 prop at around 8600 rpm. My 20cc DLE turns a 17X6 at around 8500 rpm, as does my Zenoah G20. These are static rpm, don't know what the unloaded rpms may be.