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  1. #1
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    Default Speeds for different lbs

    I have a shoulder issue and would like to drop to a 50lb bow. Since speeds are shown for 30" 70lb, how do u know what a bow would shoot at 27" 50lb without shooting it first?

  2. #2
    are u a fat boy? kbohunt's Avatar
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    Default ha bud

    Quote Originally Posted by RepairMan View Post
    I have a shoulder issue and would like to drop to a 50lb bow. Since speeds are shown for 30" 70lb, how do u know what a bow would shoot at 27" 50lb without shooting it first?
    there's alot of ways to go at speed and alot to explain but ill give you a start
    for every 1 lb of bow poundage you reduce you loose 2 ft per second.
    so if your dropping a bow from 70lbs to 50 your looseing close to 40 fps..but you can gain some back with the weight of your arrow and head being reduced...for every 5 grains of arrow weight you reduce you gain 1fps so if you drop 100grains in arrow weight you gain..20fps..see how it works..

    this is just a start..on draw length im not quite sure how to factor in speed lose or gain..hope this helps
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  3. #3
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    This helps a lot Thanks

  4. #4
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    Quote Originally Posted by kbohunt View Post
    there's alot of ways to go at speed and alot to explain but ill give you a start
    for every 1 lb of bow poundage you reduce you loose 2 ft per second.
    so if your dropping a bow from 70lbs to 50 your looseing close to 40 fps..but you can gain some back with the weight of your arrow and head being reduced...for every 5 grains of arrow weight you reduce you gain 1fps so if you drop 100grains in arrow weight you gain..20fps..see how it works..

    this is just a start..on draw length im not quite sure how to factor in speed lose or gain..hope this helps
    This covers most of it. Most bows will lose between 10 and 15 fps per inch less than 30". I like to average it and say about 12 fps per inch.

    These speed losses are figured if using the same arrow weight as you would at 70#. In truth you can't do much to compensate for the draw length difference. Going from 70# to 50#, though, you would normally not shoot the same arrow. You'd shoot a lighter spined arrow and one that is lighter in weight also. There are lots of arrows to choose from.

    Do the math and you'll note that 70# shooting a 350 grain arrow works out to 5 gr/lb. For a 50# bow this would come to a 250 grain arrow, one that is doable for target and/or 3D work, but not quite practical for hunting due to possible poor penetration.

    Another thing you can do if you are looking at new bows is pick a few that have high IBO speed ratings. If you can handle the draw cycles of some of these you can at least get decent speed. I can relate as I am limited to about 50# myself, with a 26.5" draw. I take a beating on the draw length factor, but will not shoot longer just to get more speed. I won't compromise accuracy for speed. Presently I'm shooting a Martin FireCat, rated at 335 fps. Shooting a 316 grain arrow (ACC 3-28) at 50# it chrono'd at 260 fps. Not a barn burner, but quite acceptable. I've gotten complete pass throughs on deer with less.

    Other things you might consider for hunting with such a rig is to shot a narrower cut broadhead with 3 blades, not four and limit shots to less than 30 yards, which most are anyway. Be a little more picky about shot angles and such. It's all a big trade-off, but sure beats giving it up altogether.
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  5. #5
    Senior Member kebees4's Avatar
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    I don't know what others will shoot but my Accomplice at 53# and 28.5" draw shoots 275 grain arrow at 286 FPS. With 325 grain arrow it shoots 272FPS. I had shoulder problems a few years ago so I now shoot lower lbs. It blows right through deers with no problems.
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  6. #6
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    Good info Thanks

  7. #7
    Senior Member hunter2678's Avatar
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    Go to this site...it'll help calcualte your speeds alot more accurately. When I entered my specs I was within +-2fps from actual speed.

    http://www.backcountrybowhunting.com/articles/tools.php
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    That is great web site. I can now pick out a bow that will fit my needs. Thanks

  9. #9
    Senior Member MeanV2's Avatar
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    If you are a whitetail hunter, then speed is really not the issue, but a more usable factor is KE. Bows today are very effecient and a 50# bow has plenty of KE to take down game in NA.
    I would still lean towards a medium weight arrow unless hunting the wide open plains of the west.
    I fell out of a stand several years ago and messed up my shoulder big time. The following season I hunted with a 40# bow, killed 3 deer, and blew completely through all of them.

    Good Luck and enjoy Archery!!

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  10. #10
    Uncle Sam's Canoe Club SandSquid's Avatar
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    on the advice of my orthopedic surgeon, who is also an archer himself, I just re-worked my 2 primary wheeled bows, both Martin P3 w/ Elite limbs, the Target Bow has Furious_X Cams and the Camo Bow has Nitrous_X Cams on it..

    Both are set to exactly 45# @ 27.5"


    The Hunting/ 3-D bow is shooting Victory XRingerHV V1 350 spine w/ VaneTec 1.75" Fita vanes: 272 grains total: @ 255 FPS

    The target bow is shooting Victory NanoForce V1 500 Spine w/ 4" natural feathers, 254 Grains total: @ 260 FPS


    My daughter got a clean pass through on a doe w/ a 25# @ 25" Parker Sidekick shooting a Victory BuckBuster shaft tipped w/ a 80 grain Magnus Buzz Cut.

    It's not ALL about speed and KE it's about shot placement!
    Last edited by SandSquid; 11-22-2009 at 05:02 PM.
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  11. #11
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    I shoot mostly 3d fun-shoots with my grandson. I was after a little speed to set a 25 yard pin and shoot it for 20 and 30. I am not that great at judging distance. I now know I can shoot a lower lb bow and get the results I was after of 240 fps or so.

  12. #12
    Senior Member MeanV2's Avatar
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    That's Great! If you plan on shooting spots with one pin from 20 to 30 you'll have to use a little Kentucky elevation

    I hope to be shooting with my Grandson's in a couple of years

    Dan

    Quote Originally Posted by RepairMan View Post
    I shoot mostly 3d fun-shoots with my grandson. I was after a little speed to set a 25 yard pin and shoot it for 20 and 30. I am not that great at judging distance. I now know I can shoot a lower lb bow and get the results I was after of 240 fps or so.
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  13. #13
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    Quote Originally Posted by RepairMan View Post
    I shoot mostly 3d fun-shoots with my grandson. I was after a little speed to set a 25 yard pin and shoot it for 20 and 30. I am not that great at judging distance. I now know I can shoot a lower lb bow and get the results I was after of 240 fps or so.
    240 fps is real doable. Even 260 fps shouldn't be that hard to get. I'm shooting a Martin FireCat at 45# and 26.5" draw getting right at 260 fps. Hard cam? You bet, but not bad at that low draw weight.

    Just remember to shoot any bows you get interested in. Keep a list of Por's and Con's on each one till you find that magical bow. I hope your grandson outshoots you. LOL.
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  14. #14
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    look at my sig.
    Mathews DXT 57lbs 278fps 351grain

  15. #15
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    Quote Originally Posted by hunter2678 View Post
    Go to this site...it'll help calcualte your speeds alot more accurately. When I entered my specs I was within +-2fps from actual speed.

    http://www.backcountrybowhunting.com/articles/tools.php
    i got 300.5fps with my hunting arrow on this site
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