Originally Posted by
mitchilito
Here is a noteworthy thing: for this maiden it had the small Venturi carburetor on it which ran great on the test stand. However, during the initial flights it refused to behave. During the flight you see here I was actually running it with the choke half way on! That was the only way to get it to behave. SO: I went back to the RCGF 15cc Walbro carb
That is something I have observed many times in glow-to-gas conversions, that a carb that has basically flawless response on the ground, becomes a pig in the air. I cannot give a real explanation, I can only confirm that it happens a lot.
Something similar happens when you run a Zehoah G230 with the carburettor as used in buggies and planes, in a heavy scale helicopter. Light trainer helicopters no problems, heavy scale ships and suddenly you're in trouble (flame-outs).
No idea why, it just happens.