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

Latest topics

» has anyone checked out the sling shot channel lately?
by Andy. Tue Dec 12, 2017 2:11 pm

» Reciprocating Saw?
by c sitas Sun Dec 10, 2017 8:41 am

» Brace Hieght?
by chaz Fri Dec 08, 2017 8:02 pm

» My 2nd crossbow project - german crossbow with cranequin
by fester Thu Dec 07, 2017 12:08 pm

» Hemp cord and nut drilling?
by fester Sat Nov 25, 2017 5:22 am

» My project Powermaster
by EugeneSlagle Mon Oct 30, 2017 1:54 pm

» Lillohus crossbow
by Dark Factor Mon Oct 30, 2017 12:45 pm

» Old Powermaster project & question.
by EugeneSlagle Mon Oct 30, 2017 8:14 am

» Medieval composite bows
by Dark Factor Sat Oct 21, 2017 1:44 am

» Medieval bowyer
by Dark Factor Wed Oct 18, 2017 12:30 pm

» New crossbow builder
by wjbates1430 Tue Oct 17, 2017 2:10 pm

» Airsoft Crossbow-Finished at Last!
by JacobL Thu Oct 12, 2017 7:27 pm

» Powermaster Madness
by c sitas Wed Sep 27, 2017 8:41 am

» Powermaster
by c sitas Wed Sep 20, 2017 9:58 am

» Best wood for a novice?
by Geezer Sun Sep 17, 2017 9:21 am

» Adding a steel sear insert?
by Geezer Fri Sep 15, 2017 7:13 am

» Great Machines
by c sitas Sat Sep 09, 2017 5:39 pm

» Medieval Crossbow Bolts DIY Question
by Rumburak Thu Sep 07, 2017 12:17 pm

» Berkhamsted Castle and Glasgow Museum wooden prod crossbow
by Juniper Fri Aug 25, 2017 3:54 pm

» Beware of Alchem
by Archer46176 Mon Aug 21, 2017 3:33 pm

» How to measure and cut leather for prod
by Celtic Archer Sun Aug 20, 2017 5:56 pm

» Crossbow with built in lever?
by John Edgerton Thu Aug 17, 2017 12:38 pm

» Of Bows and Torsion Engines
by JacobL Mon Aug 14, 2017 12:03 pm

» Early Lever and pin Crossbow
by topfmine Mon Aug 14, 2017 8:56 am

» Crusader crossbow
by topfmine Mon Aug 14, 2017 8:53 am


    My version of medieval hunting crossbow

    Share
    avatar
    Todd the archer
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 581
    Join date : 2010-02-25
    Age : 55
    Location : sellersville,pa.

    My version of medieval hunting crossbow

    Post by Todd the archer on Sun Jan 02, 2011 1:41 pm

    I have been working on this for about 5 months off and on.

    It uses a laminated wood and fiberglass prod 157# @12" power stroke mounted on a walnut tiller
    It may not be a historically correct medieval crossbow, but that is not what I was trying to achieve. I wanted a medieval "style" crossbow to use for hunting. So it has some variations such as the stirrup is independent of the binding for the prod.

    This is done for two reasons:
    cocking the crossbow puts no strain on the bindings holding the prod and the stirrup is bolted on with two lag bolts which strengthen the forend of the tiller.
    avatar
    Todd the archer
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 581
    Join date : 2010-02-25
    Age : 55
    Location : sellersville,pa.

    Re: My version of medieval hunting crossbow

    Post by Todd the archer on Sun Jan 02, 2011 1:46 pm

    The nut is made from walnut 1 1/2" wide with a steel insert expoxied in for the trigger sear.

    The bolt clip is made PVC pipe heated and molded to shape.
    avatar
    Todd the archer
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 581
    Join date : 2010-02-25
    Age : 55
    Location : sellersville,pa.

    Re: My version of medieval hunting crossbow

    Post by Todd the archer on Sun Jan 02, 2011 1:59 pm

    Couple more touches for hunting. I came up with an automatic saftey that sets when the crossbow is cocked. You must hold back the spring loaded hinge under the trigger with your index finger while squeezing the tickler/trigger.

    There is also a small groove at the end of the tiller to accommodate a rope cocker.
    Performance is better than I thought, chonograph says 243 FPS with a 428 grain arrow.
    Thanks for looking Todd
    avatar
    Moon
    Techno Weeny

    Lets put a laser on it!!!


    Techno WeenyLets put a laser on it!!!

    Posts : 55
    Join date : 2010-02-25

    Todd

    Post by Moon on Sun Jan 02, 2011 3:05 pm

    You are the man!!! Who made your recurve limb? Nice! cheers
    avatar
    Todd the archer
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 581
    Join date : 2010-02-25
    Age : 55
    Location : sellersville,pa.

    Re: My version of medieval hunting crossbow

    Post by Todd the archer on Sun Jan 02, 2011 3:40 pm

    avatar
    Moon
    Techno Weeny

    Lets put a laser on it!!!


    Techno WeenyLets put a laser on it!!!

    Posts : 55
    Join date : 2010-02-25

    Thanks

    Post by Moon on Sun Jan 02, 2011 3:47 pm

    How wide is it?
    avatar
    Todd the archer
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 581
    Join date : 2010-02-25
    Age : 55
    Location : sellersville,pa.

    Re: My version of medieval hunting crossbow

    Post by Todd the archer on Sun Jan 02, 2011 4:42 pm

    Just measured it. At brace it measures 34 1/2" tip to tip.
    avatar
    Ivo
    Admin
    Admin

    Posts : 1041
    Join date : 2009-11-25
    Age : 29
    Location : NJ, USA

    Re: My version of medieval hunting crossbow

    Post by Ivo on Mon Jan 03, 2011 3:59 am

    Good stuff Todd,

    Three things caught my eye:

    Very clean job on the binding and I have to agree with you on the path taken with the stirrup...keep things from stretching and therefore keep the prod from moving around...smart move.

    Great idea with that safety... that is one clever nick-nack that qualifies for the simply genius award.

    Beautiful recurve prod, I remember basilisk120 first showed off his bow with one of these laminated limbs, but I didn't realize they did glass laminated prods with such a wild veneer under it... definitely will drop a compliment to the elkridge guys. Wondering how heavy they managed to push the design, being glass prods they should easily go up to #200, although I don't see the need. BTW, what kind of arrow did you use in your test?

    All in all, glad to see the forum helps and that wheels are turning...Great job and happy hunting. Smile

    Ivo

    PS: Did you put a makers mark on this bow yet?




    * *
    ~ "I don't have any special talents. I'm only passionately curious."
    * * *
    ~ "All Genius is Simple"
    * *
    avatar
    Todd the archer
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 581
    Join date : 2010-02-25
    Age : 55
    Location : sellersville,pa.

    Re: My version of medieval hunting crossbow

    Post by Todd the archer on Mon Jan 03, 2011 4:08 pm

    Thanks Ivo. Yeah I got the idea for the prod from seeing Basilisk 120,s crossbow. The one that I got was the heaviest Joe had in stock (Wow no wait time!). I asked about heavier ones but got a funny look from him and he said why would you want anything heavier. He said he might consider making heavier ones but after seeing how this one performs I see no reason to bother.
    The arrow I used is something else again. It is a 3/8" diameter hardwood (guessing ramin wood) dowel from a set of window blinds. It is 14 1/2" from the butt to the back of the 125 grain field point. Glued on two 3" feathers and filed flat sides on the butt end to fit inbetween the fingers of the nut. The total weight on a powder scale was 428 grains. In the future I want to make up some longer and heavier combos.
    No, I have not put a "makers mark" on it but now you have me thinking!
    Todd
    avatar
    Moon
    Techno Weeny

    Lets put a laser on it!!!


    Techno WeenyLets put a laser on it!!!

    Posts : 55
    Join date : 2010-02-25

    Re: My version of medieval hunting crossbow

    Post by Moon on Mon Jan 03, 2011 4:52 pm

    Todd, if you get a chance to chrono your setup please let us know the results.
    avatar
    Todd the archer
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 581
    Join date : 2010-02-25
    Age : 55
    Location : sellersville,pa.

    Re: My version of medieval hunting crossbow

    Post by Todd the archer on Mon Jan 03, 2011 5:31 pm

    I did shoot it thru my chrony: 3 shot average- 242.8

    Todd
    avatar
    Moon
    Techno Weeny

    Lets put a laser on it!!!


    Techno WeenyLets put a laser on it!!!

    Posts : 55
    Join date : 2010-02-25

    That is smoking!

    Post by Moon on Mon Jan 03, 2011 7:09 pm

    and well worth the extra 7 inches in width over the steel prods....at least worth my rethinking which way to go :-)
    avatar
    Todd the archer
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 581
    Join date : 2010-02-25
    Age : 55
    Location : sellersville,pa.

    Re: My version of medieval hunting crossbow

    Post by Todd the archer on Mon Jan 03, 2011 7:26 pm

    No doubt the extra width allows for a longer power stroke which I believe is where the speed comes from. Also as a result of the longer stroke the over all length is 38 1/2" from end of stock to end of stirrup. Even so it only tips the scales at about 5 pounds as I did make the stock slender and sort of stretch out.

    Todd
    avatar
    Moon
    Techno Weeny

    Lets put a laser on it!!!


    Techno WeenyLets put a laser on it!!!

    Posts : 55
    Join date : 2010-02-25

    I would probably

    Post by Moon on Mon Jan 03, 2011 7:32 pm

    keep the power stroke to about 9 or 10 inches. I would still end up with more speed than I can get with a similar draw weight steel prod and save physcial weight in the process. We shall see.
    Thanks for the info Very Happy
    avatar
    Basilisk120
    Moderator
    Moderator

    Posts : 548
    Join date : 2010-03-01
    Age : 38
    Location : Arizona

    Re: My version of medieval hunting crossbow

    Post by Basilisk120 on Mon Jan 03, 2011 9:35 pm

    That is one good looking bow and a clever way to mount to foot loop. I like how those composite prods can keep the crossbow weight down as well.
    I should add that the prod on my bow has a cool snake skin like finish from the wood choice that didn't show up too well in the picture.

    Yeah that long power stoke is were it is at.



    Something Something Dark Side
    avatar
    basileus
    Crossbow Building Wiki
    Founder & Curator
    Crossbow Building WikiFounder & Curator

    Posts : 86
    Join date : 2010-06-18

    Re: My version of medieval hunting crossbow

    Post by basileus on Tue Jan 04, 2011 11:31 am

    Todd the archer wrote:No doubt the extra width allows for a longer power stroke which I believe is where the speed comes from. Also as a result of the longer stroke the over all length is 38 1/2" from end of stock to end of stirrup. Even so it only tips the scales at about 5 pounds as I did make the stock slender and sort of stretch out.

    Todd

    Widening the bow allows increasing the poundage without having to shorten the draw length. Or in other words, width does not affect the maximum draw length, unlike thickness.

    Anyhow, the performance of that crossbow seems very good. Steel bows seem to require heavier bolts to work effectively. One of my steel crossbows (~150 pounds, 14" draw) gives 184fps with same weight bolts as yours. Doubling the bolt weight increases my crossbow's performance (energy output) significantly, around 40%. I doubt yours would benefit as much for a heavier bolt.

    What's your draw length, btw? The suggested 9-10" seems too little for such a long bow. I'd use more (15"?) but then again I don't know how much punishment fiberglass-wood bows can take...
    avatar
    Todd the archer
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 581
    Join date : 2010-02-25
    Age : 55
    Location : sellersville,pa.

    Re: My version of medieval hunting crossbow

    Post by Todd the archer on Tue Jan 04, 2011 4:08 pm

    Just to clarify things about the draw length. The power stroke of 12" is measured from the string at rest or brace height to the groove in the nut. Add to that the brace height of 3" from string to the inside of limb where it makes contact with stock and you have an overall draw length of 15". Hope this makes everything more clear.

    Todd

    Sponsored content

    Re: My version of medieval hunting crossbow

    Post by Sponsored content


      Current date/time is Fri Dec 15, 2017 6:12 pm