View Poll Results: Why is jump so rare?

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  • Nobody wants it

    1 12.50%
  • Initial cost too high

    4 50.00%
  • Too much maintenence

    1 12.50%
  • I think it's dangerous

    2 25.00%
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Thread: Jump Rotorhead Dynamics

  1. #21
    Jim, good luck and keep us informed, it is an interesting topic.

    K.O

  2. #22
    Well its been three months since Kevin's post, and I've lost a lot of time due to summer travels but it is creeping along. Have made the three tower blocks and pre-rotator plate and am working on the combination carrier. Oh, and the patent has been issued so that's nice. Not a whole lot to report for 3 months but it's a beginning.

    Jim

  3. #23
    We have learned to be patient with the process.

  4. #24
    At Last, Preliminary assembly for first spin in the garage. Well, not exactly the first, but the first complete with secondary blocks and hub bars. Happy to say no vibration. Blade straps and blades will make a huge difference, .but progress now is visible. The 2x12 box underneath houses the control mechanism with switches for indicator lights on the dashboard. I had planned on having these in the cockpit but lost motion in cables and the need for maximum accuracy required placing them as close to the action as possible.
    Weight is still the question, though I am encouraged by how smoothly and easily it spins and teeters. My original guesstimate for weight was pretty close The whole system with gimbal, but without pre-rotator, comes in at almost exactly 180 pounds.

    Click image for larger version. 

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  5. #25
    PRA Secretary JOHN ROUNTREE 41449's Avatar
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    Wow looking good James!!!

    Nice work!
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  6. #26
    That's a lot of weight, what size rotors will you be using?
    K. O

  7. #27
    I have Fleck 12 footers, new old stock - have seen them quoted at 28 lbs each, but not sure if that includes nose spars or not, so am allowing 35 lbs each. My 180 lbs includes the blades. Took the blades out of the box for inspection when I got them but have never weighed them. If the 28 lbs is for completed blades the total weight will be 14 lbs less, or 166 lbs. I understand Skywheels 31 foot system weighs about 95 but not sure what is included. The web site seems to indicate that's blades, center section (hub bar) and teeter block, so for comparison you would have to add your existing rotor head and gimbal.
    Jim

  8. #28
    PRA Secretary JOHN ROUNTREE 41449's Avatar
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    Thanks for the heads up!
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  9. #29
    A little more info -- The 28 lbs does include nose weights and top leveler plates. So my blades, hub bars, straps, and bolts come in at 85 lbs. for a 30 foot disc, as compared to 95 for skywheels. My rotorhead with gimbal comes in at 80 pounds so that's the biggie, for a total weight of 165 pounds. Went back and re-read Ed Alderfer's article from the '90s about his 25'8" set of Flecks which weighed 72 lbs and realized he gave all the info I needed to compute the weight of the blades alone. He flew them on 3 different machines (one single and two 2-place) for 100 hours before he wrote the article, and said they were everything he wanted in blades, so I expect to be pleased too. Just have to find nose weights and top leveler plates.

  10. #30
    PRA Secretary JOHN ROUNTREE 41449's Avatar
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    So in comparison it's not that heavy!
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