sling-slingshot / coil sling.

Discussion in 'Crazy contraptions' started by slingfist, Feb 27, 2012.

  1. slingfist

    slingfist New Member

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    The sling is a weapon that uses centrifugal force to apply energy to a projectile that when released from its rotation continues in the direction it was travelling when it was released in the hope that some of that energy will be delivered to a target. The slingshot is a similar weapon that uses stored energy in an elastic, typically rubber, band to apply energy to a projectile that when released continues in the direction it was travelling with the same hope. The sling-slingshot / coil-sling uses a crank to turn a spool that stretches an elastic, typically rubber band; the spool can be a screw that stretches the band to great length into a coil. The spool can have a core that heats and cools. It heats with electicity and cools with liquid gas so rapidly that when the ball is released all the forces that enforce the laws of thermodynamics are simply unleashed.<br><br><br><br>Butane can be used to produce rapid heating-cooling cycles, as it cools when released from its tank and can be ignited instantly. The inside of the spool must be the butane holding tanks, and the outside housing of the device must be the heating element. Hot outside, cool inside. Some thought has to be done on energy transfer. Is it better to have the tank on inside or the outside? Would the heating element be too insulated by the rubber to be in the core? Or is that better? We want to have rapid cooling and rapid heating for repeated shots. It cannot be rapidly cooled with a hot core. But heat will transfer faster to a cold core heating the band when the ambient temperature of the outside of the device is not as cold as the inside. That is unless the entire thing is insulated.
     
  2. mr_paradox

    mr_paradox New Member

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    Is there a schematic of this ?
     

  3. slingfist

    slingfist New Member

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    I just built one (not with the gas tank that was a flight of fancy) out of a bicycle wheel and a tire inner tube and, a piece of rusted metal tubing. It was only temporary and I disassembled it until I build a better version. Basically I attached the bike wheel (a front wheel) to the metal tube (it had pre drilled holes). To one end of the tube I attached the piece of inner tube band. Then I tied the other end of the tube around the wheel (this is where the ball would be held). Then I turned the wheel until the band was stretched allmost all the way around the wheel. The idea is to release the band attached to the wheel at this point. This will swing the ball like a sling and release it very fast.<br><br><br><br>The weather is not nice here presently, and my workspace is an unheated wood building. When the weather improves, I will build the device with a rear bike wheel, and the crank and chain. As well as a bicycle brake. I will use the crank to turn the wheel and stretch the band, and I will use the brake to hold and release the wheel. I'll also have to figure out a firing mechanism to hold and release the ball. Maybe I'll use a second brake mounted on the wheel itself to hold the ball, and its brake lever mounted on the medal.<br><br>The idea is that if we look at the wheel like a clock, at 12:00 the band will be connected to the tip of the device. As this is a right handed weapon the band will tighten clockwise. So the wheel brake will be mounted on the frame at about 11:55-59. At 12:01 the ball brake will be mounted on the wheel. This brake is squeezed as the pedal is turned, holding the ball. When the wheel has been rotated so that the ball brake is touching the wheel brake, the wheel brake is squeezed. Now both brakes are being held. When it's time to fire simply release the ball brake (or both) and sling the ball.
     
  4. mr_paradox

    mr_paradox New Member

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    More complex then my idea.<br>Basically have a drum full of balls around the edge.<br>Spin the drum very fast.<br>Have a trap door that could release one ball at a time.<br><br>I have to think about it more <img src="http://illiweb.com/fa/i/smiles/icon_smile.gif" alt="Smile" longdesc="2">
     
  5. onnod

    onnod Im from Holland, isnt that weird?

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    it sounds cool...