BlaizeSD:

If you haven't ordered that engine yet, I'd suggest that you do some homework. The first rule of engine buying is to NEVER believe the horsepower figures in the ads.

It is physically impossible for a 23cc gas engine to make more horsepower than a 29cc glow engine. It would be a very well designed 23cc gas engine if it were making over HALF the horsepower of the 29cc Saito.

What matters is how fast it will turn a prop. Do some searches and ask some questions on the engine forum here and you will save yourself some major "buyers remorse".

Jim