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

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    Cocking via moving the bow.

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    Post by ora8i 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 by stuckinthemud1 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.


    Last edited by stuckinthemud1 on Sat Aug 22, 2020 12:52 pm; edited 1 time in total
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    Post by ora8i 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 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 by jungblut 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 by Andy. 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 by Geezer 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 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 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 by kenh 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 by ora8i Fri Aug 28, 2020 2:03 pm

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


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