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

Latest topics

» Binding on the stirrup
by stuckinthemud1 Today at 3:28 pm

» yew and sinew prod help needed
by stuckinthemud1 Today at 2:44 pm

» horn inlay and veneer
by OrienM Yesterday at 8:44 pm

» Trouble with my Gafa
by Geezer Yesterday at 12:31 pm

» Presentation
by c sitas Wed May 23, 2018 4:31 pm

» My latest crossbow
by drawknife Tue May 22, 2018 3:13 pm

» Medieval composite bows
by Dark Factor Mon May 21, 2018 12:46 pm

» The Arbalist Guild - Around the World
by stuckinthemud1 Sun May 20, 2018 5:32 am

» angles and rivets
by Geezer Fri May 18, 2018 1:16 pm

» morticed nut blocks
by Dark Factor Wed May 16, 2018 12:02 pm

» Crossbow triggers
by Croftage Mon May 14, 2018 1:41 pm

» Cocking lever
by c sitas Fri May 11, 2018 8:09 am

» Late roman crossbow
by Dark Factor Wed May 09, 2018 10:27 am

» For Sale: Masai Crossbow
by TonyU Tue May 08, 2018 6:35 am

» Powermaster Madness
by Archer46176 Sun May 06, 2018 8:08 pm

» Fast loading crossbow
by septua Mon Apr 23, 2018 9:22 am

» lashing a glass prod in raw hide?
by kenh Sun Apr 22, 2018 7:00 am

» Balestra Veloce / Leonardo DaVinci
by msalazar2310 Fri Apr 20, 2018 10:37 am

» Goats Foot Lever
by Geezer Wed Apr 18, 2018 12:42 pm

» Hickory and Ipe 180lb flatbow
by actionbow Mon Apr 16, 2018 1:56 pm

» goat foot questions.
by Geezer Sat Apr 14, 2018 10:26 am

» Prod questions....
by Geezer Mon Apr 09, 2018 10:58 pm

» convert compound cross bow to ball shooter
by kenh Sun Apr 08, 2018 7:34 am

» Skane Lockbow replica (and making of)
by actionbow Wed Apr 04, 2018 11:10 am

» String traps bolt to tiller when loosed
by Geezer Tue Mar 27, 2018 9:36 am


    Big draw length crossbow

    Share

    MRobin
    Tinkerer

    If there is a will, there is a way.


    TinkererIf there is a will, there  is a way.

    Posts : 67
    Join date : 2012-09-01
    Age : 28
    Location : Paris, France

    Big draw length crossbow

    Post by MRobin on Sat Sep 01, 2012 3:31 pm

    Hi everyone,

    New here, I'm from France, and have a long-time passion for achery, bows and crossbows though I don't have a lot of equipment. Here's a crossbow I finished some weeks ago, quite heavy one, designed so it can shoot two bows at the same time like penobscot's bows. But for now it has only one, a 50 or 55 lbs plumtree bow with a specially big draw length (22", taken from the back of the bow) which makes it quite efficient.

    As an improvement I want to craft more powerful wooden bows, using yew preferably.
    Currently it shoots a 20 gram aluminium quarrel at 140 fps, with nice accuracy. I think I can double this with a stronger bow, and get even more if I add a second one.





    At full draw (bends too much in the middle) :



    I know this is not scrupulously medieval (dacron string, screws), but I do with what I've got, while trying to get it to look good enough. Will post more pics if you want.
    avatar
    kenh
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 765
    Join date : 2012-08-03
    Age : 69
    Location : Living Aboard a Sailboat in Fort Myers, FL

    Re: Big draw length crossbow

    Post by kenh on Sat Sep 01, 2012 6:06 pm

    Nice looking bow! Little things like Dacron don't matter...
    avatar
    Todd the archer
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 581
    Join date : 2010-02-25
    Age : 56
    Location : sellersville,pa.

    Re: Big draw length crossbow

    Post by Todd the archer on Sat Sep 01, 2012 6:09 pm

    Pretty cool, how long is the prod?

    No doubt long draws helps performance (look at what they are doing with modern crossbows) but generally old world crossbows went with short draw/heavy weight set ups. Some are as short as 5".

    Also what release/lock are you using on your crossbow?

    Todd

    MRobin
    Tinkerer

    If there is a will, there is a way.


    TinkererIf there is a will, there  is a way.

    Posts : 67
    Join date : 2012-09-01
    Age : 28
    Location : Paris, France

    Re: Big draw length crossbow

    Post by MRobin on Sun Sep 02, 2012 12:47 am

    The prod is 45" long notch to notch, with a pretty big initial deflex.
    As for the release system, it's very traditionnal, here's a picture from earlier stage :



    I then reduced the ends of the nut and trigger's shafts (Ø5mm to Ø4mm), so they fit into the reinforcement plates, and cannot escape.

    I will probably add a spring to the trigger, it often gets half engaged which is kinda dangerous because then a very little action on the trigger is enough to release.

    This crossbow was designed to hold heavy draw weights, so if I can lay a hand on a leaf spring I will give an attempt at "big weight AND length" haha. But for now it's not likely to exceed 100 or 150 pounds.

    Sponsored content

    Re: Big draw length crossbow

    Post by Sponsored content


      Current date/time is Fri May 25, 2018 4:41 pm