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

Latest topics

» First Build
by banuvatt Today at 6:00 am

» Just finished my windlass crossbow!
by phuphuphnik Mon Jan 13, 2020 3:46 pm

» How to lash on a lath?
by stuckinthemud1 Sat Jan 04, 2020 8:52 am

» Stonebow Buildalong
by banuvatt Mon Dec 30, 2019 5:57 pm

» Question regarding the goat’s foot lever
by Wildtech Sun Dec 29, 2019 9:25 pm

» Any one seen a string release like this?
by tallpine Fri Dec 20, 2019 8:10 pm

» PVC pipe prod: Normal or loose laminate?
by banuvatt Tue Dec 10, 2019 3:37 pm

» swiss national museum crossbow IN-46
by stuckinthemud1 Tue Dec 03, 2019 8:58 am

» Question regarding the goat’s foot lever
by Geezer Mon Nov 25, 2019 8:16 pm

» Just finished my windlass crossbow!
by Arcuballista Mon Nov 25, 2019 2:26 pm

» How to Test the Breaking Strength of a Matieral for a Bow String?
by banuvatt Sat Nov 23, 2019 5:13 pm

» Compound twinbow pistol (posts vs pulleys)
by chaz Thu Nov 21, 2019 4:07 am

» Linen or Hemp String
by banuvatt Sun Nov 17, 2019 11:35 am

» Length of End Loops for Prod String?
by Geezer Sat Nov 16, 2019 7:46 am

» Nut Diagram
by banuvatt Wed Nov 13, 2019 1:53 pm

» 17th century stonebow school project
by banuvatt Tue Nov 12, 2019 5:46 pm

» swiss national museum crossbow LM-6010
by stuckinthemud1 Fri Nov 08, 2019 4:29 pm

» what depth to Install a Prod and angle
by globalmark Fri Nov 08, 2019 4:42 am

» Tickler Dimensions?
by Geezer Sat Nov 02, 2019 9:56 pm

» Pins in Trigger Mechanisms
by Gnome Sat Nov 02, 2019 3:49 pm

» How To Make a Roller Nut?
by banuvatt Fri Nov 01, 2019 3:16 pm

» Roller Nut Size
by banuvatt Thu Oct 31, 2019 7:59 pm

» anyone know anything about this one - updated with new image
by stuckinthemud1 Thu Oct 31, 2019 6:16 am

» Laminating crossbow limbs
by banuvatt Mon Oct 28, 2019 4:33 pm

» Info required for old laminated limbs
by banuvatt Sat Oct 26, 2019 5:48 am


    Death by snapped steel prod

    jokum
    jokum
    Fresh Blood

    Doesn't mean
    I'm new to crossbows


    Fresh Blood Doesn't meanI'm new to crossbows

    Posts : 17
    Join date : 2011-01-02
    Age : 48
    Location : sweden

    Death by snapped steel prod Empty Death by snapped steel prod

    Post by jokum on Wed Jan 02, 2013 11:12 am

    hello all
    It is a widespread "fact" that if your steelprod (bow, for those of us that are not american :-)) breaks or snaps while in use the two ends will sving round and harm (kill) you, now I wonder if anyone in here have any experience with this, any live footage, any calculations or arguments within the laws of physics?
    Looking forward to hear from you.
    Jokum
    Geezer
    Geezer
    Master Crossbowyer
    Master Crossbowyer

    Posts : 1154
    Join date : 2010-01-12
    Age : 72
    Location : Austin, Texas, USA

    Death by snapped steel prod Empty Re: Death by snapped steel prod

    Post by Geezer on Wed Jan 02, 2013 2:12 pm

    Jokum: Geezer here. In my experience as a crossbow maker for 35 years, I have seen ONE metal prod broken, that actually injured the shooter. A pal made a lightweight (70lb.) draw aluminum-prod crossbow, made with a leather cover over the prod. Later he chose to remove the leather cover, by cutting loose the stitching along the back, and cutting it free just outside the bridle-block. In doing so, he scored the prod all the way 'round. Unlike steel, which requires a substantial notch for crack propogation, aluminum is more like glass... a little scratch across the 'back' will do the job. So Rick took his bow out back and shot it about three times. On the third draw, the prod broke one one side, the end whipped back and struck his hand. It drew blood, barely. He went in the house and applied a band-aid. We replaced the broken prod with a new one and he went on shooting his bow, but he was pretty jumpy about drawing it for a few days.
    That's the worst I know from personal experience. We've had several aluminum-alloy prods break over the years. To my knowledge, we haven't had anybody else hurt. That isn't to say it hasn't happened, but I haven't heard about it. I believe a few steel prods out of Alchem's first batches broke, but don't have any numbers. If there had been serious injuries, or deaths, I think I would have heard of them, but maybe not....
    Then again, I'm making fairly light-weight bows, nothing over 200 lb. as a rule, and all of those have used new, purpose-built prods. Recycled leaf-spring prods, or prods drawn close to the limits of their ability might make a different tale.
    I would recommend fitting a 'sicher' strap down the back of the prod on stronger bows as a matter of course. Geezer.
    avatar
    fiddler49
    Fresh Blood

    Doesn't mean
    I'm new to crossbows


    Fresh Blood Doesn't meanI'm new to crossbows

    Posts : 19
    Join date : 2012-06-16

    Death by snapped steel prod Empty Re: Death by snapped steel prod

    Post by fiddler49 on Thu Jan 10, 2013 2:17 am

    I read some where on this site an account of a guy being killed in Sweden when his car spring prod broke at a re-enactor type event. Since then all the cross bow prods at this event have to have a piece of belt leather tied to back of prod. This method was tested with steel prods pulled till they brake. Leather prevented prods flying towards shooter. cheers fiddler49
    ferdinand
    ferdinand
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 301
    Join date : 2012-04-24

    Death by snapped steel prod Empty Re: Death by snapped steel prod

    Post by ferdinand on Thu Jan 10, 2013 6:47 am

    Better safe than sorry! I'll back my prod with leather!
    Ivo
    Ivo
    Admin
    Admin

    Posts : 1041
    Join date : 2009-11-25
    Age : 31
    Location : NJ, USA

    Death by snapped steel prod Empty Re: Death by snapped steel prod

    Post by Ivo on Thu Jan 10, 2013 8:58 pm



    Recommend you guys check out this guy's channel, some nice stuff there.

    Ivo



    Death by snapped steel prod Untitled
    * *
    ~ "I don't have any special talents. I'm only passionately curious."
    * * *
    ~ "All Genius is Simple"
    * *
    ferdinand
    ferdinand
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 301
    Join date : 2012-04-24

    Death by snapped steel prod Empty Re: Death by snapped steel prod

    Post by ferdinand on Thu Jan 10, 2013 9:05 pm

    Ivo wrote:

    Recommend you guys check out this guy's channel, some nice stuff there.

    Ivo
    Verry nice looking!
    I'll keep this in mind!
    Thanks.
    avatar
    Rizzar
    Workshop Savvy

    Did you see my tool collection?


    Workshop SavvyDid you see my tool collection?

    Posts : 194
    Join date : 2012-08-11
    Location : Germany

    Death by snapped steel prod Empty Re: Death by snapped steel prod

    Post by Rizzar on Thu Jan 10, 2013 10:18 pm

    I can recommend this method, too.

    I used this safety strap method for the last 2 prods, and compared to leather it just doesn´t look like you are hiding something.
    Death by snapped steel prod 2013-010
    Besides he is a very helpful guy, we phoned with each other a couple of times. So if there is problem with the language in his videos, I can help out.

    Rizzar
    jokum
    jokum
    Fresh Blood

    Doesn't mean
    I'm new to crossbows


    Fresh Blood Doesn't meanI'm new to crossbows

    Posts : 17
    Join date : 2011-01-02
    Age : 48
    Location : sweden

    Death by snapped steel prod Empty Re: Death by snapped steel prod

    Post by jokum on Fri Jan 11, 2013 5:00 am

    well it looks nice, but as I am making a copy of one of the early 16th century european crossbows (maximillian) it is not authentic with any kind of cord, which is why I am interested in knowing if anybody have any facts about this, if they have experienced a steelprod snapping or know of anyone who has, and when and if it does, how does it do it? does it swing back as people say, or is it just a myth?
    mac
    mac
    Master Weaponsmith
    Master Weaponsmith

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

    Death by snapped steel prod Empty Re: Death by snapped steel prod

    Post by mac on Fri Jan 11, 2013 7:46 am

    Jokum,

    I wish we had more information on this as well. I have heard that "some American was killed by his untested leaf spring bow at a shoot in Germany..." , but its a third or fourth hand account. It all has the feeling of an "urban legend."

    I am sure that badly designed steel bows can break. I am confident that when they do, there is a great chance for personal injury. As to which way the pieces fly; it probably depends on where the failure occurs and at what point in the process the limbs disengage from the loops of the string. Even if the pieces do not fly back and strike the shooter, they will probably fly somewhere, perhaps striking someone else.

    Maybe one of you computer-modeling-guys would like to to try to simulate this....?

    I also wish we knew whether a jopf like the one in the video really helps or not. It would be a shame to install one only to find out that it was insufficient to its task.

    Mac

    Sponsored content

    Death by snapped steel prod Empty Re: Death by snapped steel prod

    Post by Sponsored content


      Current date/time is Sat Jan 18, 2020 10:22 am