Posts by LunkerBuster

  • New Dude in AR

    Welcome to the boards. Nice go have you


    Lots of good info and great spears here. Ask any questions you have and take a little while to search for any topics you are thinking about. Were all here to make this sport better

  • Band rubber speed?

    Harry. Your comparison is a little off with your two guns cos the abellan has like five inches more band stretch doesn't it? That has to have something to do with it


    To jeffs original question. The snap time of a particular band has to be a curve The issue of power transfer is the limiting factor I think. Add one band and it will move at c speed if pulled to y length. Add ten bands stretched to y length and the will still snap at x speed but would be imparting more energy. So they basically enable you to increase the mass of the shaft without losing the speed. To your initial example. More people pushing the wagon at the same speed will not speed up the wagon, it will make each persons load easier OR it will let you increase the weight of the wagon without losing speed


    So working backwards, I think you get to pick the thickest shaft you feel will fly true and use enough bands to propel that at the speed you want. Then see how heavy the gun you just made needs to be and.... You know the adage, it is all compromise. A gun you can swim with, that is heavy enough to absorb recoil, that has the power to reach and penetrate fish, that is light enough to swim w .... Makes me understand why I have more than one gun :)

  • Band rubber speed?

    one thought.
    in a theoretical model you can add mass to a lighter shaft by making it longer right? so what if they were of equal mass? if you dont consider cavitation and other factors like accuracy, would the thinner spear move faster and hit harder? clearly a spearo could not use a shaft that was 4 ft longer but that makes the comparison interesting.

  • interesting quote

    This gave me chills. And the desire to hunt BW <img src= " height="23" srcset="https://spearfishing.world/forum/images/smilies/emojione/1f606@2x.png 2x">
    The word is bold cos it was from a "word a day" thing. Yes I am a word dork


    Beneath you lie two miles of ocean -- a bottomlessness, for all practical purposes, an infinity of blue. . . . A thousand coruscating shafts of sunlight probe it, illuminating nothing.
    -- Kenneth Brower, "The Destruction of Dolphins", The Atlantic, July 1989

  • Good air rifle?

    wow Dan, that is a steal!! that gun is PERFECT for backyard shooting as it is a lot quiter than mine and most


    plus it looks so cool with that suppressor <img src= " height="23" srcset="https://spearfishing.world/forum/images/smilies/emojione/1f606@2x.png 2x">

  • Band rubber speed?

    Davie really cleared it up for me, thanks buddy.



    I think the practical application for this kind of thought would be to design a device that used the bands from 350% stretch and released the spear at 50% as opposed to the current standard of 300% -0%.


    this would show us the effect of the higher order band speed only without the dead band at the end of the shot...if the spear were the same length and the cross section with the same track, the spear from the test rig should exit the track sooner and with more energy imparted, not from the bands snapping faster , per se, but from using the more efficient part of their power release cycle.

  • Band rubber speed?

    my first thought is that the longer band will contract at the same rate of a smaller band if they are stretched to proportionally the same difference...the limiting factor in the "band response time" will be a factor of how much it is stretched from it's original condition.


    i think, that a 4" band stretched to 16" will "snap" faster, than a 5" band stretched to 15". since one is 1:4 and the other 1:3


    the rate of return to the original shape would be something like the cross-section x the stretch factor