Gerry,

29cc is about 1.8 cubic inch. For that displacement you would get much better high speed performance from a Moki 180. Most gas engines won't turn up as high as an equivilant glow engine. You also want high prop pitch (14 or 16) which tends load gas engines. I'm flying mine with an OS BGX 3500 (2.13 cubic inch displacement) with an 18 x 10 and it sucks for speed. I'm going to a 16 x 14 Bolly

If you're really looking for speed stay with big displacement glow or 45 - 50cc gas. Of course, opinions are worth what you pay for them. Good luck