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

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» Fascinating reconstruction
by drawknife Sat Oct 24, 2020 3:54 am

» Collotiere a Charavines crossbow
by stuckinthemud1 Wed Oct 21, 2020 3:17 pm

» Cutting delrin straight by hand?
by drawknife Sun Sep 20, 2020 8:09 am

» Anyone make their own bolts?
by sydney1942 Wed Sep 02, 2020 3:03 pm

» Cocking via moving the bow.
by ora8i Fri Aug 28, 2020 2:03 pm

» Claw crossbow prototype
by Phil Abrahams Fri Aug 28, 2020 9:20 am

» Stirrups, how heavy? Design help needed
by stuckinthemud1 Tue Aug 18, 2020 2:24 pm

» ash lath and pin-lock crossbow
by stuckinthemud1 Tue Aug 11, 2020 2:31 pm

» Finish on lashings
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» Look what the smith sent
by stuckinthemud1 Fri Jul 31, 2020 1:35 pm

» Covid 19 and crossbow builders
by kenh Thu Jul 30, 2020 10:22 am

» Crossbow accuracy
by Geezer Thu Jul 30, 2020 7:51 am

» How do you feel about miniature crossbows?
by El Zurdo Wed Jul 29, 2020 7:21 am

» how to Build a non Chinese repeating crossbow?
by Dennis Greenaway Tue Jul 28, 2020 4:05 pm

» Just finished my windlass crossbow!
by Dennis Greenaway Tue Jul 28, 2020 4:01 pm

» Sinew backed crossbow prod tillering. Update and questions.
by stuckinthemud1 Tue Jul 28, 2020 2:43 am

» snakeskin not birch bark on composite bows in medieval period
by Cornerstone Mon Jul 27, 2020 3:50 pm

» two axle mechanism makers/accurate plans?
by stuckinthemud1 Wed Jul 22, 2020 10:34 am

» Stonebow Buildalong
by banuvatt Thu Jun 25, 2020 9:00 pm

» How to Attach a PVC Prod to a Stock?
by banuvatt Tue Jun 02, 2020 8:22 am

» finally started my first composite bow
by stuckinthemud1 Fri May 29, 2020 12:40 am

» AMAZING MINI CROSSBOW code name KillCovid-19
by El Zurdo Thu May 21, 2020 3:14 am

» Draw length ash lath
by banuvatt Thu Apr 23, 2020 9:47 am

» Would like to buy or rent a Han Chinese Trigger
by PierreC Thu Apr 23, 2020 2:37 am

» High Draw Weight PVC Crossbow Build
by banuvatt Fri Apr 17, 2020 3:07 pm


    Cocking via moving the bow.

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    • Post n°1

    Cocking via moving the bow. Empty Cocking via moving the bow.

    Post by ora8i on Sat Aug 22, 2020 10:23 am

    I can across a slingshot rifle were the slingshot forks are pushed down the shaft/ tiller with the foot stretching the elastic.

    Moving on to a crossbow if the string is put into the trigger mechanism, the front of the tiller  placed on the floor and the prod pushed down the tiller with the feet. Thus using body weight to bend the bow, obviously the prod has to lock into position when pushed down.


    Has anybody built a bow on this principal, would it even work?


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    • Post n°2

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    Post by stuckinthemud1 on Sat Aug 22, 2020 12:19 pm

    Its an interesting concept but must confess I am struggling to see the point when a stirrup works so well, foot in stirrup, 2 hands pull the string back, job done. On my lightweight target bow I don't even have to leave my seat to do it.


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    Post by ora8i on Sat Aug 22, 2020 12:25 pm

    I weigh 100K I'd have my work cut out to pull that.

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    Post by stuckinthemud1 on Sat Aug 22, 2020 12:58 pm

    My light bow is 30lb draw but I can span a 100lb bow with a stirrup and bare hands and have seen 150lb pulled like that, the stirrup makes a huge difference to the effort needed.  You can make a stirrup just by tying a loop of rope onto the prod to check it out
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    • Post n°5

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    Post by jungblut on Sun Aug 23, 2020 3:44 am

    Thats just adding another complication. You would have the equivalent of two triggers to make. One for holding the string and the other for olding the prod in position. One other factor not in its favour is the likelihood of the prod "trigger" failing with disastrous consequences.
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    • Post n°6

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    Post by Andy. on Mon Aug 24, 2020 3:09 am

    A "slingshot rifle" is often difficult to cock without the mentioned extending stock. As you have to span the elastic (with ammo ball) and locate it into the release forks..... difficult when the bands are under tension. So sometimes best to load... THEN cock in this scenario.
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    • Post n°7

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    Post by Geezer on Tue Aug 25, 2020 7:31 am

    It might be easier to move the lock than the bow (prod) There were late medieval/renaissance bows that were built that way.  The principle is perhaps best seen in the Todd's Stuff video on balestrinos (assassin's bow) But a similar system shows up on larger sporting crossbows.  The entire lock slides in a mortice... forward to pick up the string, back to full draw to fit bolt and release. Geezer
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    Post by kenh on Wed Aug 26, 2020 4:54 pm

    Ora -- if -- as you say -- you'd have trouble spanning a crossbow using a stirrup and pulling up on the string, you would have exactly the same problem spanning a crossbow by pushing down on the prod.  Either way you use your back.
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    Post by ora8i on Wed Aug 26, 2020 5:05 pm

    Errr...... I don't see why.

    The front of the tiller goes on the ground and then you "step on" the prod or a bracket connected to it. 

    Weight drives the prod down and spans the bow not strength.


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    • Post n°10

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    Post by kenh on Thu Aug 27, 2020 11:01 am

    IF you have enough weight... You mentioned only weighing 100lbs...  You probably would not be able to cock 100# draw prod by stepping on it.
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    • Post n°11

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    Post by ora8i on Fri Aug 28, 2020 2:03 pm

    Sadly that's 100Kg and I'm on a diet from purgatory...


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