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Thread: working out FT LBS TO FPS

  1. #16
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    Smile thanks celtic warrior

    thanks for that link, its a peach.
    shedhead

  2. #17
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    converting ftlb to fps

    Quote Originally Posted by tye8180 View Post
    http://extorian.co.uk/shooting/pellets.html

    depends on pellet weight

    8.4 grain@ 780 fps= 11.35lbft
    8.4 grain @ 1000 fps=18.66lbft
    that cant be right as i put my rim fire on the crono and it fired at 980 fps that would mean it was fireing under 18ftlb nar cant be should be around 900ftlb?? have another look at that matie

  3. #18
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    Quote Originally Posted by mal mason View Post
    have another look at that matie
    After nearly 4 years he's probably beyond caring.

  4. #19
    Big Dave is offline Formerly known as Badger410
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    Quote Originally Posted by mal mason View Post
    that cant be right as i put my rim fire on the crono and it fired at 980 fps that would mean it was fireing under 18ftlb nar cant be should be around 900ftlb?? have another look at that matie
    I think you need to look at the equation again.

  5. #20
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    Quote Originally Posted by mal mason View Post
    that cant be right as i put my rim fire on the crono and it fired at 980 fps that would mean it was fireing under 18ftlb nar cant be should be around 900ftlb?? have another look at that matie

    Check your figures again. 1000ft/lb rimmie? Firing an 8 grain bullet?

  6. #21
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    Quote Originally Posted by mal mason View Post
    that cant be right as i put my rim fire on the crono and it fired at 980 fps that would mean it was fireing under 18ftlb nar cant be should be around 900ftlb?? have another look at that matie
    no it wouldnt as your rim fire round would be weighing at 40grns as that is the average weight for sub sonic. therefore your rimfire running at 980 is knocking out about 85ftlb which is correct. hence if you were using high velocity rounds they weigh a lot less usually around the 32 grn weight the velocity comparable will be a lot higher.

    980x980x40 divided by 450240 =85.32ftlb.

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