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Thread: Open Source Pre-Rotator Project Description

  1. #21
    Quote Originally Posted by James J. Judge 42935 View Post
    Greetings from a newbie. As far as pre-rotators are concerned -- my drill drivers have an amazing amount of torque for such a small motor - any chance it could be enough, even if 2 required? Jim
    Jim If my memory is working correctly and that is often times doubtful LOL a couple of years ago there was a guy on the Rotary Wing Forum that was using a
    battery drill to pre-rotate . I thing he said that he would get the rotor spinning as fast as possible with the battery drill and quickly remove the drill, throw it in the grass and start a takeoff roll. I think he was rather happy with the results. I do not have any idea what rotor rpm he actually reached. Marc

  2. #22
    Quote Originally Posted by James J. Judge 42935 View Post
    my snapper mower has a really simple transmission, a steel disc powered by the engine and a clutched rubber tire connected to the wheels. The rubber tire moves across the disc for infinite speeds, and the friction is enough to power the mower very well. Easy to make and low maintenance. Does the pre-rotator really need gears and chains? Maybe a flat bottom on the pre-rotator plate and a rubber wheel on a drill to move across it would power it? Maybe might need a larger diameter plate for more leverage to get it started? Would probably be as light as you could get. No doubt you've got somebody there smart enough to figure out if it could be possible. For somebody like me it would have to be trial and error and I don't have anything similar to trial with, and why spend time and money creating some kind of a test apparatus when you guys have wizards to figure such things on paper? Cheers. Jim
    GREAT IDEA. I can guarantee your friction disc can be made to work. I have seen them used in some wild applications, the most interesting was on a Bush Hog to create a right angle drive for the cutter. It was probably transferring at least 30 HP at around 5 - 6 hundred RPM It used a pair of 14 or 15 inch automotive tires to accomplish it. The big questions are if it can be kept light and small enough with low enough drag. In the end we will probably have to have between a half HP and 3 HP. My best guess. Until we figure out the actual power requirements it will be difficult to work out.

  3. #23
    PRA Secretary JOHN ROUNTREE 41449's Avatar
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    James very interesting! I never seen an application using a friction disc!!

    Thank you Mark for the evaluation that help at least me learn about this... Will add it to the list!!!

    Thanks again you guys ROCK!!
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  4. #24
    PRA Secretary JOHN ROUNTREE 41449's Avatar
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    Much more good news!

    We have very good friend of mine just volunteer...

    Marc Oestreicher is now our newest member of team PRA!
    Actually he keeps helping me/us anyway and knows things I do not so I asked him... but what are friends for?

    Thank you Bro!!!
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  5. #25
    Brent Have you tried Kelly controls? If you have not looked at their stuff yet try this
    http://kellycontroller.com/kds24200e...ller-p-77.html

    Quote Originally Posted by BRENT DRAKE 38604 View Post
    Joe. I have an electric prerotator. Its off of a Toyota. Approx. 1200watt. I'm familer with both of the motor control companies. Never have a soft start that is 12v capable. I'm working ng on other solutions as we speak.

  6. #26
    John, Do you think this pre-rotator would work on a Dominator?

  7. #27
    PRA Secretary JOHN ROUNTREE 41449's Avatar
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    Quote Originally Posted by Chris Bonnerup 42191 View Post
    Moderator John,
    Is this thread concerned solely with electrically powered per-rotators for light gyroplanes? Seems to me that to rotate a 27-30 ' heavy rotor to appreciable RPM (250+) in a reasonable time one would need at least 35 - 45 ft. lbs. Tough to do with electrics at decent weight.
    Hi Chris
    Well we started with the harder heavy weight two-place per-rotators but will use a different motor for the lightweight gyroplanes next!
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  8. #28
    Question - What are you considering for a bendix style gear or is this bendix just part of the starter you are are buying?
    Ed L.

  9. #29
    PRA Secretary JOHN ROUNTREE 41449's Avatar
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    Quote Originally Posted by Ed Leugemors 43270 View Post
    Question - What are you considering for a bendix style gear or is this bendix just part of the starter you are are buying?
    Ed L.
    Hi Ed
    The bendix will be different to replace the original on conversions. On new it will depend on the current rotor-head for each model.
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  10. #30
    Ok is there a brand of starter gear that is most common or are they custom built.

    Ed L.

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