You have a point, captinjohn. My 100 burns the heli fuel pretty fast. I have long since forgotten tank size, but my flights are now down to 8 minutes from 11 or better when I ran 15% nitro. The heli fuel burns faster.

Frankly, I just do NOT see the Goldberg chipmunk as a suitable airframe for a small gasser . And the cowl is NARROW. The problem with the Saito 120 is that it is heavy. It's the same case as the Saito 150 and 180 I believe. I think the 100 is perfect, but that's my $.02. I have power for days.

-Cheech

http://www.devino.org/mark/airplanepics/chipmunk.jpg