Once upon a time I had consistant engine quiting at high angles of attack in a homebuilt with header tank. Usually on take-off. It was "keep the nose down or glide". Also very low GPH fuel consumption. CAUSE: Float level set too low in carb on certified engine. Set float to factory specs and all was well.
Bob Urban **************************************************** Steve Dold wrote: > > Regarding the possibility that the pitch-up attitude might > cause loss of fuel pressure, I don't think the fuel level > in the tank necessarily has to be down to, or below, the float > level in the carb for the engine to lose power. Here's why: > > There is a certain "head" of pressure needed to > ensure enough fuel flow at full power. Even if the fuel level in > the tank is a little higher than the carburetor, the pressure > might not be enough. > > If, for example, the fuel level was two inches higher in the > tank than at the fuel level in the carb, the pressure would only be > about that of the weight of fuel equal to a column two inches high > with the diameter of the pipe. The majority of the fuel isn't providing > pressure to the line, only the small column above the tank outlet. > That isn't a lot of pressure, and it might take more than a couple > inches of column height to give a high enough flow rate. > > FWIW I had this happen to me in a J3 once in a steep nose-up attitude, > with about a quarter tank of fuel. I nosed down and the thing came > back to life, so I think that's what it was - low pressure. > > Steve Dold
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