Princeton Sailwing

Discussion in 'The light stuff area' started by Dick M., Apr 3, 2012.

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  1. Nov 6, 2019 #41

    Riggerrob

    Riggerrob

    Riggerrob

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    What if you sew a thick wire into the wing root, then slide that into a C channel on the fuselage?

    For roll control, bolt the tip rib securely to the leading edge tubular spar, but allow the spar to rotate in bearings at the root. To roll the airplane, you merely twist a bell crank that is bolted to the inboard end of the tubular spar. The wider apart the wing root bearings, the less friction.
     
  2. Nov 6, 2019 #42

    Riggerrob

    Riggerrob

    Riggerrob

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    Sorry folks,
    But my post number 8 was inaccurate. Upon closer inspection, Thomas H. Purcell's wings were much simpler than Princeton Sail Wings. Purcell only used a tubular leading edge and a single steel cable in the trailing edge.
     
  3. Nov 7, 2019 #43

    crusty old aviator

    crusty old aviator

    crusty old aviator

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    Wouldn’t a nylon rope be lighter than a wire? That what modern sloop sailboat mainsails use. That C channel would have to pretty stiff though, that means it’s either wicked heavy or wicked expensive, unless you’re wicked handy with carbon fiber.
     
  4. Nov 7, 2019 #44

    dino

    dino

    dino

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    Spectra unidirectional tape at the trailing edge.
     
  5. Nov 7, 2019 #45

    Riggerrob

    Riggerrob

    Riggerrob

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    Dear crusty old aviator,
    You do have a valid point. The cord or wire in the wing root is just a filler. Almost any material will do as long as it is too bulky to slide sideways out of the C channel.
     
  6. Nov 13, 2019 at 8:10 AM #46

    Martin R.

    Martin R.

    Martin R.

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    Just study figure 8 (p.e. difference between 40 and 70 lb) on page 18 in the NASA technical note D-5047 ......
    https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19690009905.pdf

    ..... and then make up your own mind about the "high" of the pitching moments ;)
     
    Last edited: Nov 13, 2019 at 8:27 AM

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