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Thread: arrow speed help

  1. #1
    AlienX
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    Default arrow speed help

    hey guys just tryin to guess my arrow speed i shoot easton powerflights with blazer vanes 100 grain tips the weight is 392 grains. my bow is set at 66# draw length is about 28". nothing but a peepsight and a d loop on the string. o yeah im shooting a rytera alien x i hoping that i might be close to 300fps+/-. the sight says 329 with 28/60 and 300 grains. i know a chornograph is the best way but i was hopin someone would have an idea
    thanx Alien X

  2. #2
    Super Moderator bfisher's Avatar
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    Justan educated guess, but working from the advertised IBO??????

    Subtract 10 fps for factory fudging. Now we're at 319fps. Subtract 30 fps for the extra arrow weight--now it's 289fps. Add 10 fps for the extra draw weight--- 299fps. Subtract 5fps for the stuff on the string----294fps. Now subtract 4fps just forgood measure and round down to 290fps

    Anything over that is a bonus and may make you feel better. Now when you do chrono the bow let me know how close I was.
    If You're Not Living on the Edge You're Taking Up Too Much Space
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  3. #3
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    BFISHER - bet yer within about 3fps !

    jmo...

  4. #4
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    i would say 285-290, my firecat is just like that and i get 289 out of it

  5. #5
    Dave308
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    This will get you as close as possible without a chrony.

    http://utopiaprogramming.com/ke/KineticEnergy.html#

  6. #6
    AlienX
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    thanks for the help guys

  7. #7
    NewNYBowhunter
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    Default speed on my Firecat

    I did a chronograph on my Firecat with 70# draw weight, 30" draw length 362 or 368 gr. arrow, Martin whisker biscuit, G5 meta peep, kisser button, and a string loop, and got 309 fps.
    I have more than 1/8" between my cables and my posts, but not sure how to twist them properly, and then bring the ATA and brace height back into spec.
    If I twist the cables to "wrap the cams" do I untwist the shooting string to get the Axle to Axle and brace height back? Or do I just deal with a shorter ATA?

  8. #8
    NewNYBowhunter
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    Default some quick measurements

    I just checked my ATA and it's at 32 9/16" my brace height is at 6 7/8" my tiller is even, and my center shot is about 7/8'' from the shelf. I have about 3/16'' distance from the edge of the pin to the cable on my lower cam, and just a hair more than 3/16'' on the top cam. How much speed can be gained from a small adjustment to bring me in by about 1/16'' on the cams each? And approximately how many twists would it take to make up how much space?
    Last edited by NewNYBowhunter; 09-04-2009 at 06:46 PM.

  9. #9
    AlienX
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    Cool

    well i just got my bow chronoed at 320 fps with a 309g arrow what i normally shoot isa392 gr arrow at 293 fps I LOVE THIS BOW
    Last edited by AlienX; 09-28-2009 at 03:49 PM.

  10. #10
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    309gr Arrow at 70 lbs?

    You know that this will void your warranty?
    (2) Hoyt PCEXL

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