Your opinion on the Tractor Style Gyrocopter?

Discussion in 'Hangar Flying' started by cheapracer, May 4, 2017.

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  1. May 17, 2017 #81

    cheapracer

    cheapracer

    cheapracer

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    The Chinese market. There is a growing demand and excitement for aircraft, but one teensy little problem, no airfields to land in. There is a large interest in helicopters and gyros here due to that reason, but many want airplanes.

    Therefore a craft that fits into the stol, cheap and easy to manufacturer, and easy to pack up and take it home/storage.

    Safety is a large factor also.



    I also think you watch the Pitbull video in the first post and you are either bitten or you're not.
     
  2. May 17, 2017 #82

    rtfm

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    Definitely bitten, mate. Maaate!
     
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  3. May 17, 2017 #83

    rtfm

    rtfm

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    Sketchup - I'm getting there... (bought a book...)
     
  4. May 17, 2017 #84

    cheapracer

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    There are 1000's of Youtube tutes from scratch, they are so easy to follow.
     
  5. May 17, 2017 #85

    saini flyer

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    From Chuck Beaty @ rotaryforum:


    The power to run the rotor comes from the airstream, the rotor acting in part as a windmill. Its windmill efficiency is pretty good, perhaps 70%. The airstream is created by the propeller pushing the gyro through the air and here, the efficiency is pretty low, in the range of 50%. So the overall efficiency is the product of the two, 35%. For simplicity, say 33%, one third. Then one HP applied to the rotor via a driveshaft is like 3 HP at the engine crankshaft.--

    The profile power consumed by a rotor varies as the cube of tip speed; spin the rotor twice as fast and it eats 8x the power. But not quite the panacea it seems at first glance.
    The only difference between partial power and no power is the rotor disc angle. With partial power, the rotor disc angle is essentially flat; with no power, the rotor disc assumes the typical autorotation angle of +9º or so.


    Dick DeGraw used a ratio of 1:7 for partial power. Torque considerations limit rotor power to ~10% of propeller power; otherwise there will be difficulty with yaw control so a 10HP partial power can do wonders...literally:

    1. Shorten the take off distance
    2. Reduce perhaps eliminate the dead man zone
    3. No change in autorotation for engine out as only the disk angle changes
    4. Improved fuel economy
    5. Reduce the drag of the rotor= more power for TO
    6. Reduce the drag of the rotor= more speed in cruise



     
  6. May 17, 2017 #86

    cluttonfred

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    I am quite sure that Chuck Beaty and Dick DeGraw know a whole heck of a lot more about gyros than I ever will, period. It would be very interesting to see a detailed analysis and flight test data for both performance and handling with a partially-powered rotor. I do expect that there would be handling trade-offs, but I'd love to learn more.
     
  7. May 17, 2017 #87

    cheapracer

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    ... and the craft falling.
     
  8. May 17, 2017 #88

    bmcj

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    Remember the "Arrowcopter"? It sort of explains autogyro mechanics at its most basic level. Add motor and prop for forward motion and you go from toy to Benson Gyro.

    IMG_7887.JPG

    [video=youtube_share;7_bns_phPjY]https://youtu.be/7_bns_phPjY[/video]
     
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  9. May 18, 2017 #89

    cheapracer

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    No.

    ... but over the years there has been a rotor with a dangling weight that kids run along towing it with a string, some make it themselves.

    Must look for them later.
     
  10. May 18, 2017 #90

    Grelly

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    Your talk of an "Arrowcopter" reminded me of these guys: http://arrow-copter.com/

    Again, might be of interest because of their "innovative wing – landing gear combination".

    Enjoy...
     
  11. May 18, 2017 #91

    cheapracer

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    Heinz, ve sell fa $50,000 ya?

    Nien, ve are European and dis is aviation, triple that!
     
  12. May 19, 2017 #92

    rtfm

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    Just another pretty pusher gyro. Meh.
     

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