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Discuss Arrow speed / bow # vs arrow weight at the Recurve Bow within Archery Interchange UK Forums; How fast will a 44# bow be able to push a 400grain arrow? Is there ...
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    Arrow speed / bow # vs arrow weight

    How fast will a 44# bow be able to push a 400grain arrow?

    Is there a calculator somewhere out there?


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    It's an X I've taken part in an AIUK Ironman Shoot. Rabid Hamster's Avatar
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    Quote Originally Posted by bjarup View Post
    How fast will a 44# bow be able to push a 400grain arrow?

    Is there a calculator somewhere out there?
    will there not be a sh!t load of variables you dont know that could affect the result? ... like the limb efficiency, bracing height, string composition, arrow material, arrow wind resistance and prob a lot more!
    Shoot and die. Don't shoot ... also die!

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    You're probably right.

    No further questions.

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    Google 'Stu Millers calculator'.
    Barebow Recurve

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    Quote Originally Posted by bjarup View Post
    How fast will a 44# bow be able to push a 400grain arrow?
    This might give you a bit of an idea ...

    http://www.archery-interchange.net/f...ow-speeds.html

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    Can you rearrange this "Energy = half x mass x velocity squared" to get an answer "at a constant temperature in a controlled environment etc"?

    I've just copied that off the medieval draw weight thread - but I saw Pip Bickerstaffe too and he talked about using this formula to calculate the bow weight based on the arrows found and knowing max poss speed that a wooden bow can project an arrow...so must be able to do the reverse?

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    It's an X BorderBows's Avatar
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    Bow performance is complex...
    but as a rule of thumb, if you take the total weight of your arrows in grains, and devide it by the weight held by the archer... then two bows of the same model should shoot the same speed if the grains per pound are equal.

    For example a 30lbs XXXX brand 68" ILF target bow will shoot a 9gpp arrow (270grain) arrow at the same speed as a 60lbs XXXX brand 68" ILF target bow will shoot a 9gpp arrow (540 grain)

    So it allows you to compair bow performance better.

    maybe that will help...

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    Edited to remove text as I just spotted MissChievous's post !
    Eats, shoots and leaves ...

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    Quote Originally Posted by BorderBows View Post
    Bow performance is complex...
    but as a rule of thumb, if you take the total weight of your arrows in grains, and devide it by the weight held by the archer... then two bows of the same model should shoot the same speed if the grains per pound are equal.

    For example a 30lbs XXXX brand 68" ILF target bow will shoot a 9gpp arrow (270grain) arrow at the same speed as a 60lbs XXXX brand 68" ILF target bow will shoot a 9gpp arrow (540 grain)

    So it allows you to compair bow performance better.

    maybe that will help...
    I shoot with 55# on my fingers, a 400 grain arrow would be 8.1 gr per #, so if my mate with 43# on his fingers is shooting a 348 gr arrow we might hope to see similar performance?
    Be the change you wish to see.

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    Quote Originally Posted by steve58 View Post
    I shoot with 55# on my fingers, a 400 grain arrow would be 8.1 gr per #, so if my mate with 43# on his fingers is shooting a 348 gr arrow we might hope to see similar performance?
    if your shooting the same make and model of bows... then yes... though release techneque can change things by as much as 4fps...

    i wouldnt expect a 8gpp out of a 40 quid set of limbs would come out like 8gpp from a 400 quid set of limbs.

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    In the Gold steve58's Avatar
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    I should have said "all other things being equal" of course!
    Be the change you wish to see.

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