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Thread: New Rotor Power? Somebody has had to think of this before.

  1. #1
    DEN
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    New Rotor Power? Somebody has had to think of this before.

    I was thinking about this a few years back, but other stuff needs to be done first and I never really did any testing.
    So, I'll throw this out there

    A small, 1-2 place craft. Put a high compressed tank of oxygen in place of the engine. Remove fuel tank to save
    weight and anything else that is not needed to save on weight.
    Route the air from the compressed tank of air up thru the center mask
    into the rotor blades, to the tips of the blade, than out thru the trailing edge.
    The compressed air will turn the blades.

    No torque = no tail rotor needed.
    Would this be feasible?
    How long would the air last?
    Worth looking into?
    Surely someone has thought of this before me.

    Hummm........

  2. #2
    Registered User D Hillberg's Avatar
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    Re: New Rotor Power? Somebody has had to think of this before.

    Even a 1500 psi cylinder wont do it. not enough volume, A tank of propane & tip jets will go a few minutes.

  3. #3
    Registered User Doggzilla's Avatar
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    Re: New Rotor Power? Somebody has had to think of this before.

    Quote Originally Posted by DEN View Post
    I was thinking about this a few years back, but other stuff needs to be done first and I never really did any testing.
    So, I'll throw this out there

    A small, 1-2 place craft. Put a high compressed tank of oxygen in place of the engine. Remove fuel tank to save
    weight and anything else that is not needed to save on weight.
    Route the air from the compressed tank of air up thru the center mask
    into the rotor blades, to the tips of the blade, than out thru the trailing edge.
    The compressed air will turn the blades.

    No torque = no tail rotor needed.
    Would this be feasible?
    How long would the air last?
    Worth looking into?
    Surely someone has thought of this before me.

    Hummm........
    I actually broke a world record with pneumatic rocketry, and no, this would not work. It would work as a launching method, but it requires water in the tank to be a counter mass. I got a 29 second flight out of one of them, but a manned system would only be feasible with a glider.

  4. #4
    DEN
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    Re: New Rotor Power? Somebody has had to think of this before.

    I should have known better, the words "Simplicity" and "Helicopter/Gyro" should never {never ever} be used in the same sentence.

  5. #5
    Registered User Dan Thomas's Avatar
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    Re: New Rotor Power? Somebody has had to think of this before.

    Quote Originally Posted by DEN View Post
    I should have known better, the words "Simplicity" and "Helicopter/Gyro" should never {never ever} be used in the same sentence.
    A gyro is simple enough. A helicopter only looks like a gyro; it has a gazillion moving parts to make safe flight possible. And every part costs a fortune.

    Howard Hughes built a tip-drive helicopter. Had a range of 40 miles. Burned fuel at an obscene rate. Many others have built them, too, but none were practical.

    Tip jet - Wikipedia, the free encyclopedia

    Dan

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    Registered User bmcj's Avatar
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    Re: New Rotor Power? Somebody has had to think of this before.

    Here's some examples of helicopters with tip jets/rockets. None of them are purely compressed gas powered. All rely on some form of chemical reaction or combustion (compressed air, alone, will not run long enough or strong enough to be practical).

    DRAGONFLY... Hydrogen Peroxide powered tip rockets. Special high concentrated Hydrogen Peroxide passes across a reactive metal screen to generate thrust with steam. The Dragonfly is largely a limited use hobby craft, and as you can see, generates a lot of steam vapor in certain conditions (maybe requiring an instrument rating? ):






    FAIREY ROTODYNE... An ambitious comercial project that worked well but was reportedly loud during transition due to the jet tips:




    GLUHAREFF PRESSURE JET HELICOPTER... A hobby craft using the very inefficient Gluhareff propane powered pressure jets. I don't know if this ever flew:




    VOLJET... Another reasonably successful proof of concept that boasted simplicity from using a single jet engine internally and venting the exhaust through the rotors and rudders:


  7. #7
    Registered User cheapracer's Avatar
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    Re: New Rotor Power? Somebody has had to think of this before.

    Den, look up the French "AirCar" (that's it's actual name).
    This space available for advertising, contact me for special rates.

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