Crossbows - Everything about Building, Modding, and Using your Crossbow Gear

Latest topics

» Beware of Alchem
by Archer46176 Yesterday at 3:33 pm

» How to measure and cut leather for prod
by Celtic Archer Sun Aug 20, 2017 5:56 pm

» Crossbow with built in lever?
by John Edgerton Thu Aug 17, 2017 12:38 pm

» Of Bows and Torsion Engines
by JacobL Mon Aug 14, 2017 12:03 pm

» Early Lever and pin Crossbow
by topfmine Mon Aug 14, 2017 8:56 am

» Crusader crossbow
by topfmine Mon Aug 14, 2017 8:53 am

» First Efforts
by rickraedeke Tue Aug 08, 2017 5:25 am

» aluminum prod
by Phil Abrahams Fri Aug 04, 2017 8:38 am

» First whitetail buck taken with medieval crossbow
by Phil Abrahams Fri Aug 04, 2017 3:38 am

» Airsoft Crossbow
by JacobL Wed Aug 02, 2017 9:11 pm

» Questions about steel prod specs
by JacobL Mon Jul 31, 2017 8:25 pm

» Faking a medieval composite crossbow prod.
by JacobL Mon Jul 31, 2017 8:13 pm

» Airsoft Bow
by JacobL Sun Jul 30, 2017 1:56 pm

» Hello All!
by JacobL Sun Jul 30, 2017 12:54 pm

» Padre Island Bow
by Geezer Wed Jul 26, 2017 12:14 pm

» Blocked pictures by Photobucket
by Crossbowmen Mon Jul 24, 2017 1:33 pm

» Geezer website?
by Geezer Fri Jul 21, 2017 3:01 pm

» Could I get advise on order of operations?
by Bs1110101 Wed Jul 19, 2017 4:02 am

» Renaissance Sporting crossbow
by chaz Mon Jul 10, 2017 12:22 am

» Welcome! Welcome! Welcome!
by Agniznag Sat Jul 08, 2017 12:26 pm

» The Arbalist Guild - Around the World
by Agniznag Sat Jul 08, 2017 11:56 am

» opinions please
by Geezer Thu Jul 06, 2017 10:19 pm

» Hello all!
by Tarzan65 Thu Jul 06, 2017 10:54 am

» Yet another one
by Daniel Levesque Sun Jul 02, 2017 9:37 am

» Renaissance peep sight
by kenh Fri Jun 30, 2017 4:48 am


    5/8 Speargun Band Stretch

    Share

    benjaminh123
    Techno Weeny

    Lets put a laser on it!!!


    Techno WeenyLets put a laser on it!!!

    Posts : 54
    Join date : 2015-02-23

    5/8 Speargun Band Stretch

    Post by benjaminh123 on Thu Apr 09, 2015 9:30 pm

    Hi guys,
    Do any of you know what the optimal stretch length is for 5/8 speargun band? JoergS says that rubber can be stretched 5x its relaxed length, but on most of the spearfishing websites recommend 3x.
    avatar
    Gnome
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 403
    Join date : 2011-10-16
    Age : 53
    Location : Capitol Area Maryland

    Re: 5/8 Speargun Band Stretch

    Post by Gnome on Fri Apr 10, 2015 9:49 am

    Nobody knows more about stretching rubber than Joerg. Nobody.
    Gnome
    avatar
    mac
    Master Weaponsmith
    Master Weaponsmith

    Posts : 560
    Join date : 2010-12-23
    Location : Near Philly USA

    Re: 5/8 Speargun Band Stretch

    Post by mac on Fri Apr 10, 2015 10:07 am

    Gnome wrote:Nobody knows more about stretching rubber than Joerg. Nobody.
    Gnome
    Just so. 

    The speargun manufacturers have to consult their lawyers and make recommendations accordingly.  Joerg consults God alone, and they discuss the matter till they come to an agreement.

    If you want a good, legally defensible solution then it's best to do as the speargun manufacturers say.  If you want the sort of maximum efficiency that comes near the edges of failure, then do as Joerg says.   I think I would split the difference, leaning toward Joerg's side.

    Mac

    c sitas
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 427
    Join date : 2012-11-24

    Re: 5/8 Speargun Band Stretch

    Post by c sitas on Fri Apr 10, 2015 1:13 pm

    Mac, speaking of Joerg, did you happen to see his accident?

    phuphuphnik
    Workshop Savvy

    Did you see my tool collection?


    Workshop SavvyDid you see my tool collection?

    Posts : 146
    Join date : 2013-12-02
    Location : The wastes West of Chicago

    Re: 5/8 Speargun Band Stretch

    Post by phuphuphnik on Fri Apr 10, 2015 1:31 pm

    oh no! What happened?

    c sitas
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 427
    Join date : 2012-11-24

    Re: 5/8 Speargun Band Stretch

    Post by c sitas on Fri Apr 10, 2015 6:59 pm

    A while back he was showing one of his super power slingshots.  The man is built like Samson. Any way he was shooting twenty mm steel balls.He pulled that thing backwards as far as he could reach. I think he was shooting like 10 yds. or so. Any way he hit the backstop so hard that the steel ball rebounded and hit him on the forhead. He was instantly nocked down and full of blood . He was terrible lucky ,a little one way or another would have taken his eye out and possibbley would have killed him. I have done this  with a 50 cal. lead ball. Same result. He had this on vidieo  at the time.

    JoergS
    Tinkerer

    If there is a will, there is a way.


    TinkererIf there is a will, there  is a way.

    Posts : 69
    Join date : 2011-09-07

    Re: 5/8 Speargun Band Stretch

    Post by JoergS on Fri Apr 10, 2015 10:21 pm

    Nothing happened, really. This video fooled many people:



    But it was made with MSPaint... which leaves no scars Smile



    Regarding the question, you can stretch latex based rubber bands to about 5,5 times the relaxed length. But then it will not last many shots. If you only stretch it to 4,5 times, then it will hold much longer than your average crossbow string.

    c sitas
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 427
    Join date : 2012-11-24

    Re: 5/8 Speargun Band Stretch

    Post by c sitas on Sat Apr 11, 2015 7:12 am

    Nice one Joerg, You have a sick look at things. I am already a fool, I really didn't need your help.
    avatar
    Gnome
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 403
    Join date : 2011-10-16
    Age : 53
    Location : Capitol Area Maryland

    Re: 5/8 Speargun Band Stretch

    Post by Gnome on Sat Apr 11, 2015 9:37 am

    Don't feel lonely c sitas, a number of people on this forum were taken in by this- myself included, for a short time at least. I was amused, some weren't, but at the very least it was a great reminder that we should always treat the weapons we build with respect- since most of us are in this endeavor for the fun of it, it's too easy to start thinking of these things as toys. Accidents do happen.
    Gnome

    c sitas
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 427
    Join date : 2012-11-24

    Re: 5/8 Speargun Band Stretch

    Post by c sitas on Sat Apr 11, 2015 12:05 pm

    You know Gnome, I had mentioned earlier that I done this same stupid stunt with a 50 cal. lead ball . I was shooting at about 10 yds. It hit a tree square and the stupid ball rebounded so hard it hit me in the chest. Man did that sting . The ball being lead, was flattened out to about the size of a quarter. I just never ever thought a bout something like that. Goes to show, try to use your head, but always be on the lookout for something  "a little extra".

    Hermit
    Workshop Savvy

    Did you see my tool collection?


    Workshop SavvyDid you see my tool collection?

    Posts : 245
    Join date : 2013-09-10

    Re: 5/8 Speargun Band Stretch

    Post by Hermit on Mon Apr 13, 2015 9:05 am

    Some years ago,I heard of a case in the U.S.where a man shot his wife in the head with a .22 calibre pistol.She lived,he died.The bullet ricocheted off her skull and hit him in the chest,he staggered into a police station 2 hrs. after the shooting,the police took him to hospital where he died.Poetic justice,but also proof that ricochets are highly dangerous!,especially from objects like balls and bullets
                                                       Hermit.

    Sponsored content

    Re: 5/8 Speargun Band Stretch

    Post by Sponsored content


      Current date/time is Tue Aug 22, 2017 8:38 am