Au Natural Slingshot

Discussion in 'Show off your homemades!' started by dannytsg, Jun 20, 2013.

  1. dannytsg

    dannytsg Senior Member

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    Recently I have found a new niche in making catapult and sling bows. I harvested some nice forks from my permission the other day and recently made one into a simple au natural catapult.

    I harvested this fork on Sunday, stripped the bark and rough carved it. It has been drying in my conservatory since. As is typical with tree forks it has split a little as I didn't seal the ends. I have now fitted it with yellow tubes and also fitted a screw in hook that doubles as a site/arrow rest should I choose to fire arrows. I also wrapped the lower handle in some standard silver duct tape to help with the grip.

    I shoot this OTT held at a 45 degree angle in the hand. My ammo of choice is 3/8 or M10 hex nuts that hit with a thud.

    [​IMG]
    Shown here on the left and another project on the right.

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    Shown here fitted with the yellow bands and with duct tape on handle.

    Here is a video of it shooting:

    [ame]http://youtu.be/nOtHRNcumbk[/ame]

    I also decided today to test how fast it was shooting. As I don't have a chronograph machine I found rave reviews about an app that has been designed for smart phones. After seeing a tutorial on the slingshotforum about Chrono Connect I decided to download and use it to test this out.

    After setting it up and inputting my data I shot 4 shots over it before my ammo catch box and back plate gave out to the strain.

    It was shooting consistently at 290 feet per second with a 10 gram, M10 hex nut. For you air rifle shooters that equates to 28ft/lbs of energy, consistently which is FAC territory for an air rifle! In order to double check the math I reverse engineered it with an online ft/lb calculator and it gave me the same figures so I know it is right. Here is a screen shot from the app showing the string with no deviation.

    [​IMG]

    After shooting this string I decided that some playful target practice should ensue. This was all well and good until I missed my ammo catch box and back plate hitting my shed. The hex nut went straight through the siding and ricocheted off a bike in the shed up towards the roof where it stopped. Suffice to say SWMBO wasn;t very happy and that was the end to tonight's fun. My shed now has a plaster of duct tape over the remaining hole after I tried to piece it back together.

    [​IMG]

    A lesson to be learnt that these things are serious tools that are more powerful than standard issue air rifles and are in S1 license territory for comparison!

    I will be making another one soon with the other fork and trying to tune that into a faster hunting weapon. I aim to break 300 FPS with the same hex nuts and this will be more than adequate for hunting small game.

    Dan
     

  2. Schultz

    Schultz New Member

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  3. dannytsg

    dannytsg Senior Member

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    With these types of slingshots I prefer to use tubes for going over the top of the forks as opposed to theraband.

    The bands on this are made of yellow grade surgical tubing and are producing 290 FPS with 10 gram ammo at 82cm draw. There is a lot more pull in them if I require more out of them. My theoretical calculations have said these tubes should be good for about 320fps with a 100cm draw
     
  4. onnod

    onnod Im from Holland, isnt that weird?

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    nice slingshots!