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

Latest topics

» Need some help with a Reverse Draw Crossbow
by JacobL Mon Jan 14, 2019 4:02 pm

» can you point me in the direction of a post on nut-making
by stuckinthemud1 Mon Jan 14, 2019 11:15 am

» hello from new mexico
by kenh Mon Jan 14, 2019 5:01 am

» WTB custom crossbow
by Osterreichische Thu Jan 10, 2019 8:21 am

» NFS plus a Warning: Masai Crossbow
by Osterreichische Thu Jan 10, 2019 8:14 am

» Laminated Medieval Tillers
by Rpastor248 Mon Jan 07, 2019 4:27 am

» profile of medieval composite prods?
by fester Fri Jan 04, 2019 5:03 am

» Introduce myself
by oscar Mon Dec 31, 2018 7:37 am

» lever cocking bow for sale on IMA
by phuphuphnik Mon Dec 31, 2018 4:10 am

» please critique this tiller/stock dimensions
by stuckinthemud1 Fri Dec 28, 2018 3:15 pm

» Help identifying a Crossbow
by TheNuclearkirk Fri Dec 28, 2018 2:55 pm

» Bullpup light crossbow
by Gnome Wed Dec 26, 2018 1:54 pm

» Finished Crossbow - Thanks to all - here some pic and if anyone wants info let me know happy to help .
by c sitas Sun Dec 23, 2018 8:36 am

» Model Aeroplane Rubber
by c sitas Sat Dec 22, 2018 10:57 am

» Making a wooden prod
by stuckinthemud1 Fri Dec 14, 2018 9:28 am

» 'mastic' in medieval crossbow decoration - what is it?
by kenh Thu Dec 06, 2018 5:51 pm

» Welcome! Welcome! Welcome!
by kenh Sun Dec 02, 2018 7:57 pm

» Geezers finnish crossbows?
by Geezer Tue Nov 27, 2018 7:50 am

» Miniature Cross Bows.
by stuckinthemud1 Sun Nov 25, 2018 1:35 pm

» My first Crossbow Tell me what you think!
by kenh Mon Nov 19, 2018 5:50 am

» G/Day from Queensland Australia
by Andy. Thu Nov 08, 2018 3:15 am

» Here I go, overthinking again
by stuckinthemud1 Wed Nov 07, 2018 10:15 am

» What string material is safe for Alchem Steel prods
by c sitas Sat Nov 03, 2018 10:13 am

» what's the best glue
by kenh Thu Nov 01, 2018 1:51 pm

» Advice needed re test rig?
by stuckinthemud1 Wed Oct 24, 2018 1:55 am


    Faking a medieval composite crossbow prod.

    Share

    Chapel de Fer
    Fresh Blood

    Doesn't mean
    I'm new to crossbows


    Fresh Blood Doesn't meanI'm new to crossbows

    Posts : 2
    Join date : 2017-07-26

    Faking a medieval composite crossbow prod.

    Post by Chapel de Fer on Wed Jul 26, 2017 6:35 pm

    I need some advice. I have been itching to create a reproduction of a 14th century composite crossbow for a very long time but I'm not up to the task of reproducing a composite prod with original methods. I have seen some reproductions of these bows for sale online, most prominently at todstuff.com and that got me wondering about different methods to produce what Tod calls a faux composite prod.

    Tod uses a steel prod which he pads with something (rubber? leather? wood?) to make it look like a composite prod. I was, however, thinking that one could also just build up a prod out of alternating layers of glass fibre and wood laminate (maple?), basically a sandwich of wood-FG-wood-FG-wood-FG-wood... where the wood layers are maybe ... 4 mm and the FG layers are 1 mm each? This would be repeated as often as required until you have built up a prod to original thickness. The original composite prods seem to have been between 4-5 cm wide and either of a D shaped or rounded rectangle section so the stack of FG and Maple would have to be about 3-4 cm thick @ a length of about 80-90 cm. Has anybody ever tried to build something like this? Is it even possible? 

    The other take would be to build a thinner glass fibre and wood laminate prod and pad it with something like Tod does. Any ideas about a padding material?

    Does anybody have other ideas on how structure a faux composite prod?
    avatar
    kenh
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 783
    Join date : 2012-08-03
    Age : 70
    Location : Living Aboard a Sailboat in Fort Myers, FL

    Re: Faking a medieval composite crossbow prod.

    Post by kenh on Thu Jul 27, 2017 5:59 am

    If you make a wood/glass laminate sandwich as you describe, it will be such a heavy pull you'd need a crane to cock it, even if the layers were only 1mm thick!!!  

    I build wood/glass composite bows, and a laminate sandwich 4cm wide by 6mm thick and 1meter 10cm long could have a draw weight well in excess of 150 lbs, and that's just with 3-4 wood lams between 2 pieces of glass.  Reduce the length to 80-90CM and make it 8 times thicker and you may increase the draw weight 16 times or more.  Forget it!

    Personally I would cover the steel prod with taped-on foam rubber and then sew a very thin kangaroo or goat skin cover over the whole thing.

    Chapel de Fer
    Fresh Blood

    Doesn't mean
    I'm new to crossbows


    Fresh Blood Doesn't meanI'm new to crossbows

    Posts : 2
    Join date : 2017-07-26

    Re: Faking a medieval composite crossbow prod.

    Post by Chapel de Fer on Thu Jul 27, 2017 1:40 pm

    kenh wrote:If you make a wood/glass laminate sandwich as you describe, it will be such a heavy pull you'd need a crane to cock it, even if the layers were only 1mm thick!!!  

    I build wood/glass composite bows, and a laminate sandwich 4cm wide by 6mm thick and 1meter 10cm long could have a draw weight well in excess of 150 lbs, and that's just with 3-4 wood lams between 2 pieces of glass.  Reduce the length to 80-90CM and make it 8 times thicker and you may increase the draw weight 16 times or more.  Forget it!

    Personally I would cover the steel prod with taped-on foam rubber and then sew a very thin kangaroo or goat skin cover over the whole thing.

    I figured that the layer cake idea was pretty dumb soon after I wrote that. Now I have another idea which is to simply create an modified version of a modern sporting flatbow. 



    Below is a piss poor attempt at a longitudinal section of such a prod. The light wood is a very thin maple laminate, the dark wood is something hard like oak to handle the pressure of the string, the light gray strips are glass fiber strips and the dark gray is padding of some sort, perhaps foam rubber althoug I think foam rubber may be too soft. I don't think the back of a composite bow is supposed to be squishy is it? For most of it's length the part of the prod doing the actual work would not have to be more than a few millimetres thick but it might have a thin wood  layer on the belly just to give the belly a slightly rounded surface.

    https://i.servimg.com/u/f11/19/74/39/07/prod11.jpg
    avatar
    kenh
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 783
    Join date : 2012-08-03
    Age : 70
    Location : Living Aboard a Sailboat in Fort Myers, FL

    Re: Faking a medieval composite crossbow prod.

    Post by kenh on Sat Jul 29, 2017 5:14 am

    Look in the new post here called First Efforts.  The poster has come up with a nice looking way to mask the nature of the prod.  You might consider something similar, with a compressed piece of soft plastic pipe on the back of the prod to make it seem thicker.
    avatar
    JacobL
    Tinkerer

    If there is a will, there is a way.


    TinkererIf there is a will, there  is a way.

    Posts : 76
    Join date : 2017-07-30
    Age : 17
    Location : Manitoba, Canada

    Re: Faking a medieval composite crossbow prod.

    Post by JacobL on Mon Jul 31, 2017 8:13 pm

    I've seen some people do a prod similar to the one shown in Kenh's profile pic, then wrapped with a covering seal, be it shrink wrap, hemp rope, or even duct tape. Wonder if you could do that and cover it, then paint or print on the cover? Just spitballing here

    Sponsored content

    Re: Faking a medieval composite crossbow prod.

    Post by Sponsored content


      Current date/time is Mon Jan 21, 2019 7:13 am