Examples of Aircraft Flight Performance Parameters Suitable For Curve Fit

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    • The CurvFitXYZ program can be a tool for fitting aircraft flight data for use in a mission program that predicts aircraft performance. The curve fit method provides a more accurate means of modeling flight data than table look-up procedures which use linear interpolation between data points.

    Examples of some of the many performance flight parameters which lend themselves to good curve fits are as follows:

    Climb
    Time, Distance & Fuel to Climb = f (Drag Index, Altitude)

    Normal Descent From a Given Altitude
    Time, Distance & Fuel to Descend = f (Drag Index, Altitude)

    Cruise at Constant Speed and Altitude
    Specific Range = f (Gross Weight, Drag Index)

    Optimum Cruise
    Optimum Cruise Speed = f (Altitude, Gross Weight)

    Alternate Cruise Curve Fit Method at Constant Speed
    Fuel Flow at Base Weight & 0 Drag Index = f ( Altitude)
    Delta Fuel Flow (weight sensitivity) = f (Gross Weight, Altitude)
    Delta Fuel Flow (drag sensitivity) = f (Drag Index, Altitude)

    Maximum Endurance at Constant Altitude
    Specific Range = f (Gross Weight, Drag Index) 1