See the graph below. This was taken from the log of a short flight yesterday. Total flight was a half hour, the log starts at about the 15 minute mark. Elevation was 3,000 ASL (~1,250 AGL) the entire time. Aircraft is an F1 Rocket, IO-540, constant speed prop.
Question: What caused the initial fuel flow deviation?
The initial increase from 11 gph to 20 gph (as well a changes to MP and EGT) occurred without any intervention from me, however the subsequent decrease was caused by me leaning with the mixture (till the engine stumbled) and then richening it back again. The final drop off of MP is me pulling the throttle back. There is no indication of fuel leakage, and I flew two flights today with normal fuel flows.
I am withholding one critical clue that I believe was the cause, however lets see what you all think could cause this.
Question: What caused the initial fuel flow deviation?
The initial increase from 11 gph to 20 gph (as well a changes to MP and EGT) occurred without any intervention from me, however the subsequent decrease was caused by me leaning with the mixture (till the engine stumbled) and then richening it back again. The final drop off of MP is me pulling the throttle back. There is no indication of fuel leakage, and I flew two flights today with normal fuel flows.
I am withholding one critical clue that I believe was the cause, however lets see what you all think could cause this.
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