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Thread: K factor and fuel remaining error

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    Senior Member Andy's Avatar
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    Dec 2019
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    Glendale, AZ
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    Default K factor and fuel remaining error

    Almost every time I refuel my FX-3 the indicated fuel remaining plus fuel added exceeds 39 gallons usable. This means the fuel computer is underestimating fuel flow.

    I have loaded data for every refuel in a spreadsheet in an attempt to come up with a better K factor. However, the data show there is a large variation in the fuel used error when K factor is unchanged. With factory set K factor of 68000 the error has varied between 0% and 9.8%. I do not think the data are stable enough to compute a new K factor but I have run the last 4 refuels with K factor 64600.

    I'm suspecting that the fuel flow sensor calibration is very dependent of flow and that, if K factor is calibrated for high power settings, it will be very inaccurate at low power settings. (The only zero error refuel was during early phase 1 flyoff when high power was used).

    If you log your FX-3/EX-3 fuel usage what variation are you seeing in the error of indicated fuel remaining?
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