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NASA Prandtl-D Flying wing

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    #16
    “Name that Tune!” in 30 Watts!
    “Sedate flying from a hand launch requires 35 watts per pound(W/Lb).”

    2.4 meter wing Moment of Inertia
    0.8m from centerline x 9g servo = 7.2 meter grams
    0.8m / 2 from centerline wiring for servo! x 9g??? = 3.6 meter grams
    10.8 meter grams

    0.15m from centerline x 2 x 25g motor = 3.75 meter grams (say, 30 cm between motors)
    = 29% of Moment of Inertia!


    You can't change the design of the printed wing, but you can replace the servos with two motors / propellers, closer to the centerline of the wing.

    Two pusher propellers provide thrust: half throttle for straight and level, full throttle for climb.

    Bank left by reducing power on one motor and increasing power on the other motor.


    Max Power: 30W 25g
    HC2208-1260 Kv = 1260, Rm = .450, Io = 0.50,
    Efficient Operating Current = 1-5.0A, 6.5A Max 15 seconds

    6 x 4 propeller 3 cells @ 3 volt
    9 V x 3.5V = 31.5 Watts

    HC2208 Series Motor
    HC2208-1260
    see graph of Current vs. Voltage with 6 x 4 Propeller
    HC2208-xxxx.pdf

    Doug

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