Hammergrip PFS with roller, draw length extended

Discussion in 'Show off your homemades!' started by JoergS, Jan 4, 2012.

  1. JoergS

    JoergS Administrator

    5,803
    107
    63
    <div style="margin:auto;text-align:center;width:100%">
    <a href="http://3.bp.blogspot.com/-qVtp_-MWckY/TwQOMnEmTkI/AAAAAAAABQQ/aUlutBg5fPQ/s1600/RollerPFS1.jpg" class="postlink" target="_blank" rel="nofollow"><img src="http://3.bp.blogspot.com/-qVtp_-MWckY/TwQOMnEmTkI/AAAAAAAABQQ/aUlutBg5fPQ/s320/RollerPFS1.jpg" border="0" alt=""></a><br><br><a href="http://3.bp.blogspot.com/-HmZJQb5tWsw/TwQONr2h0wI/AAAAAAAABQU/LcCHyozcGhI/s1600/RollerPFS2.jpg" class="postlink" target="_blank" rel="nofollow"><img src="http://3.bp.blogspot.com/-HmZJQb5tWsw/TwQONr2h0wI/AAAAAAAABQU/LcCHyozcGhI/s320/RollerPFS2.jpg" border="0" alt=""></a><br><br><a href="http://2.bp.blogspot.com/-fKwvykkfiRE/TwQON4LZpdI/AAAAAAAABQg/_0bFhV44La8/s1600/RollerPFS3.jpg" class="postlink" target="_blank" rel="nofollow"><img src="http://2.bp.blogspot.com/-fKwvykkfiRE/TwQON4LZpdI/AAAAAAAABQg/_0bFhV44La8/s320/RollerPFS3.jpg" border="0" alt=""></a><br><br><a href="http://3.bp.blogspot.com/-FcOvJ1pg2l4/TwQOO-KVEoI/AAAAAAAABQk/f0eIhk1LOVQ/s1600/RollerPFS4.jpg" class="postlink" target="_blank" rel="nofollow"><img src="http://3.bp.blogspot.com/-FcOvJ1pg2l4/TwQOO-KVEoI/AAAAAAAABQk/f0eIhk1LOVQ/s320/RollerPFS4.jpg" border="0" alt=""></a>
    </div>
    <br><br>After I found out that I don't need ANY kind of fork, because of the flipstyle shooting, the next logical step is to make a forkless frame with a draw length extension. <br><br>This design retains much of my favorite "hammerhead" handle, and it features a roller on a steel axis. <br><br>It shoots really good (as far as I can tell from my tests in the dark, more tests on the weekend).
     
  2. pipesmoker

    pipesmoker Member

    342
    0
    16
    wow ,fantastic design man!!!<br>this calls for a utube video!!!
     

  3. JoergS

    JoergS Administrator

    5,803
    107
    63
  4. Tobias

    Tobias New Member

    390
    0
    0
    WOW! what a job! new desing and maybe funktional!<br>well done!
     
  5. Daniel J

    Daniel J New Member

    12
    0
    0
  6. Alukuchen

    Alukuchen Senior Member

    277
    0
    0
    WOW that is a superinnovative design! Will you use it in the butterfly shooting style? If yes I would see a little danger in the bands slipping off the roller... but as i know your concepts it will work... So I'm really looking foreward to see a shooting video. It sure is a powerful slingshot!<br>so again, great design and great craftsmanship!<br>Greets
     
  7. JoergS

    JoergS Administrator

    5,803
    107
    63
    Yes, Butterfly style. The bands don't slip off, the rims of the "fork" are a bit higher than the pulley and guide the bands a bit. On release, the bands lift themselves up anyway, they never touch the roller again. The rollers are for the draw out only.
     
  8. Alukuchen

    Alukuchen Senior Member

    277
    0
    0
    hmm ok I did't see that... jap it will work, will be really hefty thats for sure <img src="http://illiweb.com/fa/i/smiles/icon_wink.gif" alt="Wink" longdesc="15"><br>Thanks
     
  9. JoergS

    JoergS Administrator

    5,803
    107
    63
    Stickshots and PFSs (essentially all flipstyle frames) are safer with butterfly bands, as there is more time for the frame to flip down. Strong bands and heavy ammo make sense, too - the strong bands make the flipping unavoidable, and heavy ammo flies slower.
     
  10. Alukuchen

    Alukuchen Senior Member

    277
    0
    0
    That makes sence... I once shot myselve with a stickshot with a thera tube silver tube and a 12mm steel ball. I think that the ball simply had no time to leave the pouch... ok thera tube silver is really slow. Ok maybe what I tell doesn't make sence xD
     
  11. gerzson

    gerzson New Member

    6
    0
    0
    Make sure you don't twist it sideways while drawn out. The extension of the grip where the rubber is attached is long enough to give it a powerfull twisting force if you tilt it (around the grip axle). Maybe it's a good idea to test this twist in a controled maner without ammo and a full face protection.<br>
     
  12. JoergS

    JoergS Administrator

    5,803
    107
    63
    gerzon, I tested that. The roller takes care of the "twisting". Without the roller, the slingshot would be impossible to control, but with the roller, the pivot is the same as on a normal handheld slingshot.