Originally Posted by
ozarque
Good conversation.
SO, the OS MAX .10 FP, in my 72" slope glider (under construction), with a 2 oz tank should run flat out for about 12.5 minutes? That sounds reasonable. A typical 20 second sprint to altitude, soar at idle for 20 minutes, the blip it if necessary on final. That is more economical then gas.
It just so happens that I am one of the very few people on this planet that actually runs an OS FP10 on gasoline.
I think, 12,5 minutes of WOT on 2 oz of glowfuel is very optimistic. Mine had trouble doing 12 minutes on 2 oz at
medium throttle
On gasoline, power is a bit down, but it WILL run flat out for about 30 minutes on 2 oz of gas.
(anybody thinking there is a lot of RPM missing: That is correct, it is swinging a Master Airscrew 8 x 4 and does not overheat or anything, something that is most definitely is impossible on glow fuel. But that's OK, that only extends the envelope of application.)
The difference is not in the WOT consumption. It is in the lower thottle settings. That FP10 on glow will struggle to idle for 25 minutes on 2 oz, on gasoline (provided proper carburation) it will have zero issues idling for 90 minutes or longer at that same 2 oz.
It is not in the economy (whether you pay 5 cents for a tank of fuel or 10, is pretty much irrelevant), it is about expanding the envelope of what is possible. Maynard Hill allready understood that. If that's your kind of thing, then go for it, if it isn't, stick with glow.