world models CAP 120
 

Hi I am going to put a gas engine in my world models cap 120. Can anyone suggest a suitable size? I was thinking about 45cc is this about right? I have no experience with gas engines so I don’t really have a clue.

RE: world models CAP 120
 

45cc's may be way too much. This is an 11 lb airplane. It's designed to use a .90 two stroke ( I have the ST G2300 1.4 in mine) or a 1.20 four stroke. - 1.80 would be better. For this aircraft, I would suggest the smaller 26cc or 34cc. But hey, these days guys are putting 1.20 four strokes in .40 size planes.....

RE: world models CAP 120
 

There have been successful combinations of smaller gassers in this size model, MVVS 1.60 for example. Dick Hanson did a ZDZ 40 in a 78" Hangar 9 Edge and brought it out at 13 lbs, but that was with a complete rebuild of the nose and considerable lightening elsewhere. Photos of that project are at http://www.somedudeshobbyshop.com/ under the dhmodels button. Rysium has a nice thread here on RCU for his Powerline Edge project, which was a successful squeaker of gasser into small model.

For a first gas project, I would urge a plane/engine combination that is a known winner, rather than something that tries to squeeze a big object into a small envelope. I have the WM CAP on this winter's schedule, which will be OS 1.60FX powered -- a well-proven combination, which I would recommend with confidence.

If you want a gasser project, I'd suggest a big stick for your first venture (Ultra-stick or something like that), where the set-up is uncomplicated and the wing loading is no more than 30 oz/sq ft. You can have a lot of fun, less frustration and a pleasurable learning experience with such a project. After that, you can experiment more profitably with some perspective to guide your efforts.

RE: world models CAP 120
 

I had a WM 1.20 size Cap 232. I had a G-23-G in it though. That's a G-23 glow version. BOY ! That plane would do anything I asked of it. Course, at the time, I couldn't manage 3D. I could get it in a hover but keeping it there...well :eek:

If I had to do it again, I think I would go with a ZDZ or some other really lightweight gas engine. The G-23-G worked well, but would have been better if it was lighter.

CJ