The Railbow Gun

Discussion in 'New project ideas' started by Dangerfield, Sep 2, 2013.

  1. Dangerfield

    Dangerfield Australia

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    Gday. Its been years since I played with slingshots and have learned so much from this forum and JoergS video's:cool:

    I am in the process of designing a sling bow and would like some input into the overall idea. The concept is that The two arrow fletches rest on the 20mm dowel and the two smaller 8mm dowels are to keep the arrow running true with enough clearance for the arrow and top vane.

    It will have a 60cm draw length and I will use the same arrow's weighing 30grams for constancy.

    I have no idea what rubber to use yet but Joerg's calculator has given me this.
    <table><tbody><tr><td>
    </td><td colspan="3">Your ammo weighs 29.07 gramms.
    </td></tr><tr><td>
    </td><td colspan="3">Cut the bands 13.95 cm long.
    </td></tr><tr><td>
    </td><td colspan="3">Band width at the fork is 3.27 cm.
    </td></tr><tr><td>
    </td><td colspan="3">Band width at the pouch is 1.31 cm.
    </td></tr><tr><td>
    </td><td colspan="3">You need 3 bands per side.
    </td></tr></tbody></table>

    Cheer's Dave
     

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    Last edited: Sep 2, 2013
  2. onnod

    onnod Im from Holland, isnt that weird?

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    nice design! looking forward to see this finished!
     

  3. Dangerfield

    Dangerfield Australia

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    Thanks for liking the idea onnod :) I just hope it works..
    I am using the same trigger as JoergS Cap'n Sparrow's slingbow because I like it's simplicity..
     
    Last edited: Sep 2, 2013
  4. Dangerfield

    Dangerfield Australia

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    Gooday Folk's. Here's an update on the Railbow.

    I did a test with theraband gold 1cm x 16cm's per side becouse the forks that I used are only a template, hence the reason for the light bands.

    I was shocked with the Baby bands best distance at 85ft....And I cant wait to load it up:D

    My first mod during the build is the trigger's pivot point.
     

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    Last edited: Sep 3, 2013
  5. ruthiexxxx

    ruthiexxxx ruthiexxxx

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    a very interesting design. I shall look forward to seeing more of it :)
     
  6. Slagskimmer Mike

    Slagskimmer Mike thinks TBG smells better than roses

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    That is looking awesome!
    85 feet from that thin band is certainly respectable.
    The calculator is only for Theraband Gold, so you've got the right stuff.
    My first slingbow is still only in my head, so let us know all the cool things you learn from building this.:)
     
  7. Flipgun

    Flipgun Well-Known Member

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    Usually arrows store/release kinetic energy by flexing. The top rails inhibit this and you are getting only linear acceleration. Your are getting a range of 85 ft but what is your FPS? Speed = Penetration. If you can make another prototype I would suggest that you eliminate the top rails, use the toothbrush retainer method to hold the arrow in place and up your rubber to take advantage of the flex effect.

    2cents
     
  8. ruthiexxxx

    ruthiexxxx ruthiexxxx

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    It sounds like you know a thing or two about arrows ! I for one would really welcome a bit of a tutorial on this if you could spare the time. I know there is a lot to learn.
    For a long time I was getting occasional crazy 'fliers' where the arrow seemed to go beserk, almost tying itself in knots on its voyage of destruction ( I shoot indoors!). Sometimes they even shattered in the bow on send-off which can be a tad unnerving. Then a kind gentleman on another forum explained the concept of 'spine weight' to me which largely solved the problem. With my really heavy arrows (12mm bamboo) it doesn't happen at all and, with more normal ones, if they fly significantly off true then I know I've given them a bit too much of a send off.

    I have never been an archer so I know that I must have a great deal to learn that would help me with designing, making and shooting my slingbows...... and making effective arrows to shoot in them.
     
  9. JoergS

    JoergS Administrator

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    Looking very nice!

    The trigger seems not perfect for the job, as the "push" method does not allow you to nock the arrow, right? I recommend my newer triggers that are basically hooks with a pivot point in line with the arrow.

    The band calculator is for hand held slingshots really. Crossbows have no problems with strong bands as you can usually draw back with both arms. I recommend adding a length of rope to the fork that you can use as a stirrup - then, double up the dimensions from the calculator. Then we are talking.

    A huge advantage of the rail design is that you are not limited by the length of the arrow, so you can use a looong acceleration. If you make the power stroke very long (say, 150cm) then you can reach the performance specs of modern compound crossbows, at a fraction of the draw weight.

    You obviously chose very strong tapering, which is great for performance - just don't expect too many shots from those bands. Leave them a bit longer so you can shorten them a few times and then re-attach them at the fork, letting a bit of the reserve out. It is sad to throw away bands after ten shots.
     
  10. Dangerfield

    Dangerfield Australia

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    Thanks for the info about the arrows storing energy. After using a compound bow for a short time I can grasp what you a saying.
    I doubled up on the bands today after making the finished forks and the best distance was 150ft at approx 10 degrees. With a broadhead it will pass threw a coke can at 50ft

    More to come Flip but I need to eat

    Dave..
     
  11. Flipgun

    Flipgun Well-Known Member

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  12. ruthiexxxx

    ruthiexxxx ruthiexxxx

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  13. Dangerfield

    Dangerfield Australia

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    <!--[if gte mso 9]><xml> <o:OfficeDocumentSettings> <o:RelyOnVML/> <o:AllowPNG/> </o:OfficeDocumentSettings> </xml><![endif]--> You are right about the trigger JoergSy .. It gets to tight under pressure and I'm getting miss-fires with more power. at the moment the string hits the back of the arrow when fired so I think I need to knock the them to avoid the miss-fires..
    After playing around I have decided to go with something similar to your Arrow launching Sling-X-Bow


    I came up with a trigger design to suit my handle and used Toothbrush's for the arrow rest. I am aiming for accuracy more than power and have a few things in mind So let's see where it goes.


    Smile

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  14. Dangerfield

    Dangerfield Australia

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    Has anyone mixed tube with band



    The black Tube with a 60cm Draw-length made 170ft
    With the Theraband-gold added to the tube I made 213ft:) it's getting to dangerous to use in town
     

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    Last edited: Sep 15, 2013
  15. Ghosth

    Ghosth Over the hill but still swinging!

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    I have a mostly aluminum handle off a swiffer wet jet that I was considering doing something similar with.


    If you can get any kind of accuracy and penetration at 30m you are doing good.
     
  16. Dangerfield

    Dangerfield Australia

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    The aluminum handle would be the way to go to save on weight Ghosth.
    I can 7 out of 10 times hit my target at 80ft with good penetration, Enough to kill a rabbit, I think and with another set of Theraband gold it should do the trick:)
     
  17. Ghosth

    Ghosth Over the hill but still swinging!

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    Wife brought me home a nice chunk of thera band green tubing from the second hand store. Just working it out in my head what kind of trigger/lock mechanism will fit best with that alum handle.

    I have not yet decided if I want the band forks solid with a sliding lock, or the lock solid with sliding forks. Leaning towards the second.
     
  18. Augusto

    Augusto Junior Member Augusto

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    Hi Guys

    First of all my congratulations! I am a "younger" man, 77 years old of age...and unfortunattely my English is very, very poor, but I am enthousiasmed concerning your excelent prototype...I will try to build one like yours! By the way I made 2 slingshot guns following videos of Mr's Joyce Clark, Alejandro Castro, Joerg...and I make a blog with many pictures, but written in Portuguese...sorry! Please,http://slingshotgunsdeoctaviodeoliveira.blogspot.pt take a look of the pictures...I used the trigger of Joerg in both models. I thank you very much your presentation! Regards...Octávio Augusto from Portugal
     
  19. Augusto

    Augusto Junior Member Augusto

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    Well my friends

    Now I have made this one slingshot gun using one typical trigger of Joerg. It works not bad, ...but my intention is make something similar to your prototype whitout rail but I have a question...to avoid the lenght of the weapon is it possible to use an rigid bow with bands?[​IMG]
     
  20. Augusto

    Augusto Junior Member Augusto

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    Hello Again

    My English is very poor...really is a barrier for me! But I will try to show you my last work not finished and using another kind of trigger copied from a video of Alejandro...I Hope that this trigger it is much better because the arrow or flechette stay in line to the middle of the fork...but my dream is to build one weapon lunching real arrows using rubber bands and an rigid bow...

    [​IMG]