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Thread: Ballistics 101: Arrow Speeds with a Laptop and a Microphone

  1. #21
    FTW
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  2. #22
    Master of Grumpiness GrahameA's Avatar
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    Fluked this at the nationals



    The archer is Cliff Freeman and you can observe the arrow about 10 metres downrange.

    Note the amount of flex in the arrow.

    I also have some video of an arrow in flight from a longbow which was taken with a Sony Video Camera. I then stretched the timeline in Premiere so that you can see the aroow porpoising in flight.

    Using normal video gear is okay for taking clips of the archer but the frame is generally to slow to see the arrow being launced etc. Need a Redlake camera.[/img]
    Regards, Grahame.

    Shoot a Selfbow, embrace Wood Arrows, discover Vintage, be a Trendsetter.

    Kathy Kirby

    Imagineering is Creative.

  3. #23
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    Excellent!!

  4. #24
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    Excellent pic, Grahame. Another from the 300D?

    Ralph,

    Maybe I'm being a little naive here, but doesn't your test show average velocity over the entire flight, while a chrono fitted close to the bow would give a snapshot velocity at the (presumably) fastest arrow speed? How would you compare your results against manufacturers spec, which would be the chrono speed, presumably (again)?

    Pete
    I'm not as drink as some thunkle peop.

  5. #25
    ***** bilbs84's Avatar
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    Glad I found this, within about 5 minutes (Including reading this, downloading Audacity, and a sound recorder for my phone, and measuring an area to shoot) I had a speed reading, I used 16 m (My tape only goes out to 8, and I figured that the longer the distance, the easier the software would be to use) It took .180s to travel 16m, that is 88.88 m/s or 291.63 fps.

    I feel I could do this again, but at 10m instead, maybe that will show a difference in the speed due to forces on the arrow, although, at these ranges, i assume they would be insignificant.
    The higher scores you shoot, the harder it is to shoot them.
    If you shoot the wrong spot, it will probably be an X.

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