Hey guys, I am getting ready to build the Carl Goldberg Super Chipmunk and I was looking for suggestions on an engine. I am leaning toward either an OS 61FX or an OS 91FX. Any suggestions would be much appreciated. I am planning on running separate aileron servos and adding a fiberglass cowl and wheel pants and possibly a smoke system. Thanks

I have an OS 61 on mine and it fly's just great. Good Luck, Dave

Hi geno472,

I have a ST 75 in mine and it provides plenty of power for the way I fly. Whils't the ST performs very well it sounds like a two stroke. If I were building the Super Chippy today I would wait until I could afford a Saito 82 or similar quality four stroke.

Based on my experience with the ST swinging a Bolly Clubman 12.5 x 6 the 91 would significantly overpower the model............but lots of people like that[sm=sunsmiley.gif]

Cheers,

Colin

A fellow club member has an OS 91FS in his, what a great sound when it flew by low. Oh..and build the flaps they work very well.

Tha .61 will fly it very well. A .91 Fs will fly it well also but sounds so much better. I think this plane is made to have a .91 four stroke in it.


Dru.

Geno, If you're debating between those two engines, go with the 91FX. The two engines weigh the same, so why not go with the extra power. I have the 91FX in my Goldberg Chipmunk and and I would not rate it as over powered at all. I do plan to switch to a 4-stroke in the near future, probably a Saito 100........RS

61 fx or Saito 82 will fly it but Saito 91 or Saito 100 is obviously better.
This is mine with Saito 91 (the best bid for a $ today)

IMHO anyone who puts a 2-stroke in this plane should be beaten with a stick.

Aside from that, if you want smoke, you REALLY should consider a 4-stroke.

An OS 91 is all it needs.

A YS 110 would be outrageous

This is also a good candidate for the heavier TT 91. Great power...better price!

My two old CG Chipmunks both had the OS91 Four Stroke and were fantastic !