Originally Posted by
doxilia
Matt,
glad to hear it! I've been interested in the GGT15 as it might reduce the engine weight somewhat given the lack of the ignition unit.
I'm not really the person to ask about regulations and restrictions imposed by the different pattern associations as I don't participate in them given I'm in Canada. That might change some day.
That said, I believe in order of restrictions, the VRCS followed by the SPA and lastly the CPA are increasingly tolerant (or decreasingly restrictive) to power and model specs. I believe the SPA restricts power to 1400 W (glow or electric) but whether gas power is allowed or not I don't know. If I'd have to guess, I'd say it isn't. But surely some SPA member can offer better insight on this. The CPA, would likely allow it provided the power output is comparable to a piped glow 60 which I suspect it is. There is more emphasis on model design in the CPA, from what I understand, than there is on power plants. I believe span is limited to 6' = 72". Scott can answer re the CPA in detail but I think the gas 15's might be doable.
David
Thanks for the info David. I had the GG15 on order for a month and a half and it just wasn't happening. So I opted for the GT15 and got it promptly so here I am. There is a 4 ounce penalty for the IBEC/CDI modules but no extra ignition battery required. It should make a very nice powerplant for Escapes, UFO's or slightly enlarged Kaos.
About 25 years ago we ran stretched pipe 60's (Rossi's and YS's) turning 12x12, 13x10 props at around 9500 give or take on the 70-74" spanned models of the day. The GT15 is putting similar output to those set-ups on its muffler but is quieter because of the soft iso mount.