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Thread: Tumbling cylinder?

  1. #1
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    Tumbling cylinder?

    Posted: Mon Jun 30, 2014 11:41 am

    Tumbling cylinder?

    Can you help please?
    I am trying to make a tumbling cylinder using water and compressed air.
    My diagram here explains where the problem lies.

    tumbling cylinder.jpg


    Please look at it and suggest an answer. I would appreciate it.
    Thanks,
    Mike


    Read more:http://www.diynot.com/forums/plumbin...#ixzz36DiusUtU
    Last edited by Kelly Bramble; 07-01-2014 at 08:13 AM.

  2. #2
    Lead Engineer Cake of Doom's Avatar
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    Perhaps reverse the pump to create a vacuum and suck the water back up; than flip it to blow and the cycle repeats?

    You'll need a pretty solid pump to pull that off though.

    This is just a "first knockings" thought, so caveats apply.

  3. #3
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    Put a vent at each end and open the one that is on top when pressurizing.

    AceEngineer

  4. #4
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    As Timelord stated, venting the top chamber after the first flip would pressurize water up into that cylinder to create one more flip; although, unless the cylinder is restrained it will start to flip as soon as the water level in the top section exceeds that in the bottom section and could result in air transfer when the water levels equalize and fall below the tube ends when the cylinder is horizontal. But once this second flip is completed then all of the work contributed to the system by the air injection is consumed and that will be the end unless more energy is injected into the system. Otherwise, you are trying to create a perpetual motion machine.

    On the other hand, by placing a heat source below the lower cylinder and transfering the water by boiling the water in the lower cylinder chamber and condensing it in the upper cylinder chamber of a sealed and evacuated cylinder you can achieve a continuous flipping cylinder without any inial air pressurization at all. This is simply a sterling cycle type device. To best make this operate it would require a well insulated center plate to prevent heat transfer from the bottom boiling section to the top cooling section and cooling fins around the circumference of both cylinder ends to aid cooling of the injected steam in the top segment.

  5. #5
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    Like I said, one vent valve at each end and then open the one that is up. The cylinder will rotate continuously, as the upper chamber is vented to atmosphere each half revolution.

    Timelord
    Last edited by Timelord; 07-01-2014 at 06:33 PM. Reason: clarity

  6. #6
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    I want to avoid adding pressure constantly, also avoid adding heat constantly.
    It must be self contained.

    I want to put together the following 2 things to create a top-heavy machine.

    1. High-pressure air, which has two properties. a) light-weight. b) pressure enough to move water.
    2. Water, which is heavier than pressured-air,

    So by combining these two I can make a continually top-heavy machine.

    Don't take my drawing of the structure too literally, It could be a different structure, spiralling tubes or whatever.

    Any more thoughts please?

  7. #7
    Lead Engineer Cake of Doom's Avatar
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    With out constantly adding pressure/heat/whatever or changing pressure/heat/whatever, you will only get 1 revolution; maybe 2 from momentum.

    See conservation of energy and perpetual motion.

  8. #8
    Technical Fellow jboggs's Avatar
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    "I want to avoid adding pressure constantly, also avoid adding heat constantly.
    It must be self contained."

    The definition of a perpetual motion machine. Good luck.

  9. #9
    Lead Engineer Cake of Doom's Avatar
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    If it was me, I'd have started with the Star Trek warp drive; as a warm up. Then I'd look into perpetual motion.

  10. #10
    Administrator Kelly Bramble's Avatar
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