A low-cost ($100) differential pressure-based commercial off-the-shelf angle-of-attack data acquisition system was designed, successfully reduced to practice, and wind-tunnel and flight tested. For the underwing-mounted probe studied, the calibration curve, based on the ratio of P fwd / P 45 , is linear throughout the aircraft angle of attack if the probe is located between an estimated 25 and 60% of the local wing chord. A physics-based determination of angle of attack was successful, provided that a reasonably accurate aircraft lift curve is determined. Calculation of the lift curve slope was within 0.001 / deg of the value determined by flight test using an alpha/beta probe. The repeatability of the data from the commercial off-the-shelf system was excellent. Unnormalized differential pressure ( P fwd P 45 ), which is dynamic pressure dependent, does not provide adequate accuracy throughout the aircraft angle-of-attack range. Hence, systems similar to that tested, which use unnormalized differential pressure and a linear calibration, are basically only stall warning devices.


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    Title :

    Low-Cost Accurate Angle-of-Attack System


    Contributors:

    Published in:

    Journal of Aircraft ; 55 , 2 ; 660-665


    Publication date :

    2018-03-01




    Type of media :

    Conference paper , Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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