ORIGINAL: grecospad
hi to you all, i finally finished my first spad plane ,put the engine in and started tuning,and there started the problems: at first i had bubbles in the fuel line ,after asking some people i found out that the vibration caused them so i've put some foam between the fuselage and the tank and they stopped! so today i started tuning the engine .as i was playing with the rpm i decided to test the up and down of the plane. with full throttle i've pointed the plane down and then up slowly and it stopped! any ideas?my engine is a os 40 .thanks
G'day Mate,
Easy to fix, DON"T point it down, all that does is expose the clunk to air, that air goes to the carby, engine stops, only point it up, & if the engine picks up some revs, it is OK, if it stops quickly it is too lean.
I know what you are thinking, this guy doesn't know what he is talking about, what happens when it's in a dive, well, this is what happens, the fuel stays at the back of the tank, & the clunk stays in the fuel, engine keeps running.
The only way that the fuel can go to the front of the tank in a dive, is if the fuel is moving faster than the plane, & of course that can only happen if the plane suddenly STOPS, then the fuel will move forward. The tank, fuel, plane & everything attached to it are all moving at the same speed, so nothing can move around inside the plane, it obvious, if you think about it.