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890 fps possible with a simple slingshot!?

Discussion in 'Non-Firearm Weapons' started by torsten, Sep 24, 2010.

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  1. torsten

    torsten Member

    Joined:
    May 1, 2010
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    Hello,

    Did some tests with very fast bands and 7,5 mm steelballs again: first under normal conditions - chrony shooting and can penetration. And then speed tests with heated bands. The numbers with heated bands are ALL far about 700 fps??!!
    I took a bottle with cooked water to heat up the bands a few minutes before every shot. And then this numbers? Are there any experiences with chrony tests and heated bands. I think, these heated numbers are errors.
    But ALL shots with non-heated bands were ok - all around 140 m/s; 460 fps! That`s strange - errors only with heated bands?! To fast for a chrony?
    And: the water fast cooled down during the tests - the speed also decreased. The time between the first and the last shot was around 45 minutes.
    I used 3 band sets - not more than 5 shots with every set :-(
    And still no lengthwise tearing!

    After the speed test I did some shots with this stuff on cans: a shot through 2 cans was no problem with this speed and ammo.
    At the end of the video you see a little accident ( fortunately without injuries!!).

    Here is the vid:

    http://www.youtube.com/watch?v=arasZFuCXUA


    Regards
    Torsten
     
  2. Flobert

    Flobert Member

    Joined:
    Sep 23, 2010
    Messages:
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    Location:
    California
    Dam .......


    (yeah Anderson dam's near me I gotta try fishin there sometime)

    Dam ......
     
  3. Vermonter

    Vermonter Member

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    What's the weight of the 7.5mm steel balls?
     
  4. MrOldLude

    MrOldLude Member

    Joined:
    Aug 24, 2010
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    429
    If you estimate about 7.9 grams/cm^3 time the volume, you'll have the mass.
     
  5. torsten

    torsten Member

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    May 1, 2010
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    The weight is 1,734 gramm ( 26,76 grains).
     
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