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

Latest topics

» Medieval bowyer
by Dark Factor Yesterday at 12:30 pm

» Medieval composite bows
by kenh Yesterday at 10:55 am

» 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

» First Efforts
by rickraedeke Tue Aug 08, 2017 5:25 am

» aluminum prod
by Phil Abrahams Fri Aug 04, 2017 8:38 am

» First whitetail buck taken with medieval crossbow
by Phil Abrahams Fri Aug 04, 2017 3:38 am

» Airsoft Crossbow
by JacobL Wed Aug 02, 2017 9:11 pm

» Questions about steel prod specs
by JacobL Mon Jul 31, 2017 8:25 pm

» Faking a medieval composite crossbow prod.
by JacobL Mon Jul 31, 2017 8:13 pm

» Airsoft Bow
by JacobL Sun Jul 30, 2017 1:56 pm

» Hello All!
by JacobL Sun Jul 30, 2017 12:54 pm


    Alternative Crossbow Power Sources

    Share

    benjaminh123
    Techno Weeny

    Lets put a laser on it!!!


    Techno WeenyLets put a laser on it!!!

    Posts : 54
    Join date : 2015-02-23

    Alternative Crossbow Power Sources

    Post by benjaminh123 on Mon Feb 23, 2015 1:38 pm

    Hello Everyone,
    I have been thinking of some ideas of alternative/mechanical power sources for crossbows; can you give your comments and suggestions on these ideas, as well as if you think any are feasible?

    1. Torsion Springs: Two hinged/pivoting arms in the stock, powered by torsion springs;

    2. Coil Extension Springs: Two hinged/pivoting arms in the stock, each having a hook past the pivot point (closer to the tip of the stock, opposite end as the butt); the extension spring would be hooked on these hooks bringing the arms together;

    3. Coil Compression Springs: same as above except the spring is on the other side of the pivot (closer to the butt of the stock)

    I hope you understand what I am trying to get at.

    Any comments and suggestions would be greatly appreciated.

    c sitas
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 438
    Join date : 2012-11-24

    Re: Alternative Crossbow Power Sources

    Post by c sitas on Mon Feb 23, 2015 3:27 pm

    Well I'll tell you that this seems to be  an UN excepted method to propel an arrow because, it is not considered to be bow power. Will it work? certainly will. I have one using divers rubber.And about 130#pull. There have been lots of different ways of do this but, like I said. The crossbow community says no.Myself I don't care cause I'm not a pureist when it comes to this hobby.I love using my mind "what's left of it" and my tools and my hands.Also ,jawing with people like yourself and all the ones in this forum. As for satisfying your own desires, have at it.If you search the forum here you find  quite a few different ones that use different ways to shoot an arrow.

    benjaminh123
    Techno Weeny

    Lets put a laser on it!!!


    Techno WeenyLets put a laser on it!!!

    Posts : 54
    Join date : 2015-02-23

    Re: Alternative Crossbow Power Sources

    Post by benjaminh123 on Mon Feb 23, 2015 9:07 pm

    Here is another idea:

    http://i38.servimg.com/u/f38/19/15/34/76/untitl11.png

    The spring would be a spring like this one: http://www.mcmaster.com/#9654k337/=w1jinl

    Please forgive the crude drawing; I actually think this one would be the best; nice and compact
    Please give suggestions

    c sitas
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 438
    Join date : 2012-11-24

    Re: Alternative Crossbow Power Sources

    Post by c sitas on Tue Feb 24, 2015 7:31 am

    I have my rubber rigged liked that.One thing I'll say about springs is ,"WOW" when you pull the trigger. Noisy and vibrate like crazy.They work .They say great minds work together. I have that exact same pair laying on my bench. Want them?

    benjaminh123
    Techno Weeny

    Lets put a laser on it!!!


    Techno WeenyLets put a laser on it!!!

    Posts : 54
    Join date : 2015-02-23

    Re: Alternative Crossbow Power Sources

    Post by benjaminh123 on Tue Feb 24, 2015 7:43 am

    Could you send me a pic of your rubber version?
    Another Question; is there any advantage to having a solid "T" at the front of the crossbow with pulleys?
    About your springs: what length are they? I have been having trouble finding springs that extend enough. I would want about 8-10" of extension=8-10" of draw on the bow. Does the "recoil" affect aim? Is a rubber powered "bow" better in that respect? Can you develop the same amount of power?

    benjaminh123
    Techno Weeny

    Lets put a laser on it!!!


    Techno WeenyLets put a laser on it!!!

    Posts : 54
    Join date : 2015-02-23

    Re: Alternative Crossbow Power Sources

    Post by benjaminh123 on Tue Feb 24, 2015 7:44 am

    Are your springs extension or compression? How much would you want for them?

    c sitas
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 438
    Join date : 2012-11-24

    Re: Alternative Crossbow Power Sources

    Post by c sitas on Tue Feb 24, 2015 8:27 am

    They are exactly like your picture. I would call them" pull type". They are brand new except for my testing.I would say the eye on the end is about 3/4" in dia.They measure 7.5 center to centerof the eyes. They are made of .130 thuo. wire. Quite hefty . You can have them if you pay the postage.They have a mail function here ,I've never used it but I you want to talk further ,let's tryit  instead of plugging up the forum. Also I don't have any way to send pictures . I don't know how.

    edstuff
    Tinkerer

    If there is a will, there is a way.


    TinkererIf there is a will, there  is a way.

    Posts : 74
    Join date : 2014-12-16

    Re: Alternative Crossbow Power Sources

    Post by edstuff on Wed Feb 25, 2015 6:31 am

    Wow. I had something similar in mind too.  But mine was to make the limbs out of steel and have the spring at the front of the bow.  They wouldn't be under pressure until you actually cocked it.  
    Unfortunately for me I've got like 3 ideas and I haven't started any of them.  I need to move my lazy bum.

    Edit: The cool thing about this design is you can actually get a lil creative.  I was debating making the "prod" into wings. Kinda like a bat.  Only thing is I'm positive this design will be front heavy, like a compound crossbow.
    avatar
    Geezer
    Master Crossbowyer
    Master Crossbowyer

    Posts : 959
    Join date : 2010-01-12
    Age : 69
    Location : Austin, Texas, USA

    Re: Alternative Crossbow Power Sources

    Post by Geezer on Wed Feb 25, 2015 4:18 pm

    Just remember, it's important to keep your moving parts as lightweight as possible.  Heavy stuff wastes power moving itself.  As for bat-wing prods or whatever, it sounds really cool, but remember to consider air-resistance for moving parts, like prods.  So you might make (really lightweight) bat-shaped wings but make sure they move flat thru the air, and don't push a lot of air ahead of them.  Beyond that, indulge yourselves, make weird stuff.  I wanna see it all!  Geezer.

    benjaminh123
    Techno Weeny

    Lets put a laser on it!!!


    Techno WeenyLets put a laser on it!!!

    Posts : 54
    Join date : 2015-02-23

    Advantages to swinging arms or fixed bow?

    Post by benjaminh123 on Wed Feb 25, 2015 4:37 pm

    I see that on some spring powered crossbows people have put a fixed bow on the front; no levers, now bending, just a solid “bow” with pulleys at eighter end. Is there any advantage to having the pulleys farther apart rather than clos together?


    What about levers/swining arms? Can you point out the advantages?


    Last edited by benjaminh123 on Wed Feb 25, 2015 4:44 pm; edited 1 time in total

    benjaminh123
    Techno Weeny

    Lets put a laser on it!!!


    Techno WeenyLets put a laser on it!!!

    Posts : 54
    Join date : 2015-02-23

    Re: Alternative Crossbow Power Sources

    Post by benjaminh123 on Wed Feb 25, 2015 4:44 pm

    Here are some examples of what I attempted to explain above:


    Solid "bow" (unflexing, not pivoting, immovable):
    www.crossbowpylenok.aiq_.ru-grafik-glavphoto.jpg" target="_blank" rel="nofollow">http://pylenok.itsource32.ru/wp-content/uploads/2014/01/http-www.crossbowpylenok.aiq_.ru-grafik-glavphoto.jpg

    Swinging/pivoted arms:
    http://www.freepatentsonline.com/3028851.pdf

    Sponsored content

    Re: Alternative Crossbow Power Sources

    Post by Sponsored content


      Current date/time is Thu Oct 19, 2017 12:01 pm