The Arbalist Guild

Would you like to react to this message? Create an account in a few clicks or log in to continue.

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

Latest topics

» [solved]Skane/Lillohus crossbow thread
by stuckinthemud1 Sat Aug 10, 2024 3:16 pm

» Colletiere a Charavines continuing experiment
by stuckinthemud1 Fri Aug 02, 2024 7:13 am

» What you building?
by hullutiedemies Tue Jul 09, 2024 12:39 am

» 12th Century Chinese Crossbow Chronographed
by stuckinthemud1 Fri Nov 24, 2023 3:50 pm

» Crossbow Stock
by kenh Tue Oct 31, 2023 6:19 am

» Cocking - how
by stuckinthemud1 Thu Aug 03, 2023 4:24 am

» Questions around heavy crossbow lath buildin
by stuckinthemud1 Wed Apr 26, 2023 1:10 am

» Arab Crossbow
by stuckinthemud1 Tue Apr 25, 2023 7:57 am

» prod angle, and lever trigger for sale anyone?
by stuckinthemud1 Mon Mar 20, 2023 5:54 am

» flexible string
by jasper1978 Mon Mar 20, 2023 1:25 am

» jens sensfelder
by jasper1978 Wed Mar 08, 2023 11:58 pm

» 400lb Windlass crossbow bolts weight and accuracy shooting high.
by stuckinthemud1 Sun Mar 05, 2023 2:53 pm

» Codex Löffelholz crossbow
by stuckinthemud1 Tue Jan 24, 2023 4:14 pm

» Digitar prodsc
by stuckinthemud1 Sun Jan 15, 2023 2:42 pm

» Troubleshooting
by Andy. Fri Jan 06, 2023 12:29 pm

» Wood Prods
by stuckinthemud1 Fri Dec 30, 2022 12:47 pm

» Colletiere a Charavines crossbow
by stuckinthemud1 Fri Dec 30, 2022 8:54 am

» Simplified Löffelhotz speedloader
by stuckinthemud1 Fri Dec 09, 2022 4:05 pm

» Fiberglass H-bows
by c sitas Sat Nov 12, 2022 8:44 am

» Bad Antler
by drawknife Sat Nov 12, 2022 3:48 am

» Anyone make their own bolts?
by Juniper Mon Oct 17, 2022 8:20 am

» Josef alm in English
by Juniper Sat Oct 15, 2022 4:22 am

» Qin/Han lock drawings
by kenh Fri Sep 23, 2022 8:16 pm

» stirrup dimensions?
by stuckinthemud1 Thu Sep 01, 2022 1:49 pm

» Skane/Lillohus lockbow information needed
by stuckinthemud1 Sun Aug 14, 2022 6:23 am


+2
Todd the archer
Hotspur
6 posters

    Steel Alchem Prod Feet Per Second

    Hotspur
    Hotspur
    Hotspur
    Workshop Savvy

    Did you see my tool collection?


    Workshop SavvyDid you see my tool collection?


    Posts : 150
    Join date : 2012-06-28
    Location : British Columbia, Canada
    • Post n°1

    Steel Alchem Prod Feet Per Second Empty Steel Alchem Prod Feet Per Second

    Post by Hotspur Sun Dec 02, 2012 5:06 pm

    Using Audacity sound program I looked at half dozen 50 foot shots, (I know, go purchase a chronometer!)

    I don’t have enough build experience to know if I should be disappointed with the following results... (Ignorance is bliss?)

    175 lbs steel prod
    3.5” brace
    8” draw

    425 grain bolt
    50 feet
    Flight time .297 ms

    168 feet per second

    I measured six shots all identical times (mic in centre of range to cancel speed of sound error)

    How does this compare to others experience?
    • Back to top
    Todd the archer
    Todd the archer
    Todd the archer
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!


    Posts : 581
    Join date : 2010-02-25
    Age : 62
    Location : sellersville,pa.
    • Post n°2

    Steel Alchem Prod Feet Per Second Empty Re: Steel Alchem Prod Feet Per Second

    Post by Todd the archer Sun Dec 02, 2012 7:25 pm

    I think that is pretty close. my 205 pound prod from Alchem shot a similar bolt at 207 fps. With a 532 grain bolt it got 190 fps.

    With the steel prod you can figure about 1 fps for each pound of draw weight and for each 10 grains of bolt weight 1 to 1.5 fps.



    Todd
    • Back to top
    MRobin
    avatar
    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 : 35
    Location : Paris, France
    • Post n°3

    Steel Alchem Prod Feet Per Second Empty Re: Steel Alchem Prod Feet Per Second

    Post by MRobin Mon Dec 03, 2012 1:27 am

    This is what I would expect with these short medieval draw lengths.
    That's why ancient manufacturers rapidly came up with cocking devices that could cope with like >800 lbs steel bows, allowing crossbows to equal the killing range of warbows, with more accuracy !
    • Back to top
    Todd the archer
    Todd the archer
    Todd the archer
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!


    Posts : 581
    Join date : 2010-02-25
    Age : 62
    Location : sellersville,pa.
    • Post n°4

    Steel Alchem Prod Feet Per Second Empty Re: Steel Alchem Prod Feet Per Second

    Post by Todd the archer Mon Dec 03, 2012 2:57 am

    Keep in mind that steel prods have a certain max "dry fire" speed. Would not expect much faster speeds than maybe 230 fps no matter how light the bolt. The greatest advantage of higher draw weights is their ability to cast proportionally heavier bolts at the same speed.



    Todd
    • Back to top
    Zardoz
    Zardoz
    Zardoz
    Tinkerer

    If there is a will, there is a way.


    TinkererIf there is a will, there is a way.


    Posts : 88
    Join date : 2010-12-31
    Age : 60
    Location : New York
    • Post n°5

    Steel Alchem Prod Feet Per Second Empty Re: Steel Alchem Prod Feet Per Second

    Post by Zardoz Mon Dec 03, 2012 5:18 am

    That still sounds kind of slow even for a steel bow. Is maybe the string pressing a little too hard on the top of the tiller?
    • Back to top
    B.Cheers
    B.Cheers
    B.Cheers
    Tinkerer

    If there is a will, there is a way.


    TinkererIf there is a will, there is a way.


    Posts : 60
    Join date : 2012-10-08
    Age : 35
    Location : Austrailia Brisbane
    • Post n°6

    Steel Alchem Prod Feet Per Second Empty Re: Steel Alchem Prod Feet Per Second

    Post by B.Cheers Mon Dec 03, 2012 6:57 am

    @Zardoz if you look at his crossbow its a frictionless setup so there is nothing for the string to press/rub on
    • Back to top
    Todd the archer
    Todd the archer
    Todd the archer
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!


    Posts : 581
    Join date : 2010-02-25
    Age : 62
    Location : sellersville,pa.
    • Post n°7

    Steel Alchem Prod Feet Per Second Empty Re: Steel Alchem Prod Feet Per Second

    Post by Todd the archer Mon Dec 03, 2012 7:28 am

    The string being used is also a factor. How many strands and materials as well as construction methods play a part.

    Todd
    • Back to top
    actionbow
    actionbow
    actionbow
    Workshop Savvy

    Did you see my tool collection?


    Workshop SavvyDid you see my tool collection?


    Posts : 146
    Join date : 2012-09-18
    Age : 51
    Location : Portland, Oregon
    • Post n°8

    Steel Alchem Prod Feet Per Second Empty Re: Steel Alchem Prod Feet Per Second

    Post by actionbow Mon Dec 03, 2012 7:43 am

    A couple things, first placing the mic in the middle does nothing to negate speed of sound issues. Think about it. The sound still has to reach the mic. Half as far at firing and striking vs real-time at firing and twice as far at striking. It amounts to the same thing. Second a chrony would measure muzzle speed which would be higher than total flight time but I am sure you realized that.
    • Back to top
    Zardoz
    Zardoz
    Zardoz
    Tinkerer

    If there is a will, there is a way.


    TinkererIf there is a will, there is a way.


    Posts : 88
    Join date : 2010-12-31
    Age : 60
    Location : New York
    • Post n°9

    Steel Alchem Prod Feet Per Second Empty Re: Steel Alchem Prod Feet Per Second

    Post by Zardoz Mon Dec 03, 2012 7:54 am

    B.Cheers wrote:@Zardoz if you look at his crossbow its a frictionless setup so there is nothing for the string to press/rub on
    Sorry, I didn't see that.
    • Back to top
    MRobin
    avatar
    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 : 35
    Location : Paris, France
    • Post n°10

    Steel Alchem Prod Feet Per Second Empty Re: Steel Alchem Prod Feet Per Second

    Post by MRobin Mon Dec 03, 2012 9:37 am

    actionbow wrote:A couple things, first placing the mic in the middle does nothing to negate speed of sound issues. Think about it. The sound still has to reach the mic. Half as far at firing and striking vs real-time at firing and twice as far at striking.

    If it takes as much time for the firing sound as for the striking sound to travel to the mic, then there is no more to worry about speed of sound correction, given that we only care about a T2 - T1 thing
    • Back to top
    Hotspur
    Hotspur
    Hotspur
    Workshop Savvy

    Did you see my tool collection?


    Workshop SavvyDid you see my tool collection?


    Posts : 150
    Join date : 2012-06-28
    Location : British Columbia, Canada
    • Post n°11

    Steel Alchem Prod Feet Per Second Empty Re: Steel Alchem Prod Feet Per Second

    Post by Hotspur Mon Dec 03, 2012 11:50 am

    Todd the archer wrote:The string being used is also a factor. How many strands and materials as well as construction methods play a part.

    Todd

    Hi Todd,

    The string is Dacron B50, 50 strands from Alchem.

    Ernest
    • Back to top
    Hotspur
    Hotspur
    Hotspur
    Workshop Savvy

    Did you see my tool collection?


    Workshop SavvyDid you see my tool collection?


    Posts : 150
    Join date : 2012-06-28
    Location : British Columbia, Canada
    • Post n°12

    Steel Alchem Prod Feet Per Second Empty Re: Steel Alchem Prod Feet Per Second

    Post by Hotspur Mon Dec 03, 2012 12:03 pm

    Hotspur wrote:

    175 lbs steel prod
    3.5” brace
    8” draw



    I messed up my own stats, its a 3" brace, 8.5" draw...

    I have a 225lbs on order from Alchem, will look forward to trying that next fall Rolling Eyes ...
    • Back to top
    actionbow
    actionbow
    actionbow
    Workshop Savvy

    Did you see my tool collection?


    Workshop SavvyDid you see my tool collection?


    Posts : 146
    Join date : 2012-09-18
    Age : 51
    Location : Portland, Oregon
    • Post n°13

    Steel Alchem Prod Feet Per Second Empty Re: Steel Alchem Prod Feet Per Second

    Post by actionbow Mon Dec 03, 2012 12:34 pm

    MRobin wrote:
    actionbow wrote:A couple things, first placing the mic in the middle does nothing to negate speed of sound issues. Think about it. The sound still has to reach the mic. Half as far at firing and striking vs real-time at firing and twice as far at striking.

    If it takes as much time for the firing sound as for the striking sound to travel to the mic, then there is no more to worry about speed of sound correction, given that we only care about a T2 - T1 thing
    I guess you are right. Didn't think of it that way. Self correcting since the delay is equal. Duh on me.
    • Back to top
    Zardoz
    Zardoz
    Zardoz
    Tinkerer

    If there is a will, there is a way.


    TinkererIf there is a will, there is a way.


    Posts : 88
    Join date : 2010-12-31
    Age : 60
    Location : New York
    • Post n°14

    Steel Alchem Prod Feet Per Second Empty Re: Steel Alchem Prod Feet Per Second

    Post by Zardoz Mon Dec 03, 2012 2:03 pm

    Hotspur wrote:
    Hotspur wrote:

    175 lbs steel prod
    3.5” brace
    8” draw



    I messed up my own stats, its a 3" brace, 8.5" draw...

    I have a 225lbs on order from Alchem, will look forward to trying that next fall Rolling Eyes ...
    Good luck getting the Alchem prod by next fall.
    • Back to top
    Hotspur
    Hotspur
    Hotspur
    Workshop Savvy

    Did you see my tool collection?


    Workshop SavvyDid you see my tool collection?


    Posts : 150
    Join date : 2012-06-28
    Location : British Columbia, Canada
    • Post n°15

    Steel Alchem Prod Feet Per Second Empty Re: Steel Alchem Prod Feet Per Second

    Post by Hotspur Mon Dec 03, 2012 4:14 pm

    Zardoz wrote:
    Good luck getting the Alchem prod by next fall.

    Yes, I have ordered a couple things from Alchem. The quality was always good in my experience but man, the delivery times are measured with tree rings.

    Love the Zardoz. I actually went to a theater to see that in 74 smack
    • Back to top
    Zardoz
    Zardoz
    Zardoz
    Tinkerer

    If there is a will, there is a way.


    TinkererIf there is a will, there is a way.


    Posts : 88
    Join date : 2010-12-31
    Age : 60
    Location : New York
    • Post n°16

    Steel Alchem Prod Feet Per Second Empty Re: Steel Alchem Prod Feet Per Second

    Post by Zardoz Mon Dec 03, 2012 5:39 pm

    Lol, hardly anyone knows about the movie and quote!
    • Back to top
    Sponsored content

    Sponsored content


    • Post n°17

    Steel Alchem Prod Feet Per Second Empty Re: Steel Alchem Prod Feet Per Second

    Post by Sponsored content

    • Back to top

      Current date/time is Wed Nov 27, 2024 4:25 pm