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    How to make a slurbow?

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    Post by banuvatt Sun Jul 14, 2019 8:44 pm

    First topic message reminder :

    Hi have been looking into making some crossbows that will shoot spherical objects for my friends. In the beginning I was leaning towards bullet crossbows otherwise known as pellet bows. The crossbows that have two pillars and a leather pouch in the middle. But, but once I learned that they can occasionally misfire and shoot backwards if the pouch turns a full 180. I now am considering a slurbow a crossbow with a barrel preferably metal that has one string and shoots spherical objects. I was wondering about a trigger mechanism and any sort of design or plan. That shows the inner works of the crossbow and it's trigger mechanism.
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    Post by banuvatt Fri Jul 26, 2019 2:34 pm

    Okay thank you for the advice, it sounds good.
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    Post by septua Fri Jul 26, 2019 3:56 pm

    Has anybody viewed the video that appears on the link?    http://www.sintservatius.com/
    It shows the 5/8” lead balls being made and fed into the muzzle etc. My 9/16” steel ball bearing ammo weigh 11 grams the shuttle 13 grams. These balls defy wind but not gravity.
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    Post by banuvatt Fri Jul 26, 2019 4:44 pm

    I've seen the video yeah. I am just wondering is the bullet the same diameter as the bore as the barrel? It just, if it is how does it just slide down the barrel? Wouldn't it just get stuck in the barrel? Can anyone reaffirm this by experience or actually test this?
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    Post by septua Fri Jul 26, 2019 5:58 pm

    Since their sport is primarily vertical shooting there is minimal side bias against the tube bore. However it is possible that the slot area has a slight frictional fit but I doubt that. The steel prods are upwards of 400#.   
    I have built a cased auto safe trigger assembly with a similar clap latch but the rest is still in my slow design phase. It will not use a tube or barrel.
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    Post by banuvatt Fri Jul 26, 2019 6:53 pm

    400 lbs? Jeez, I wonder how large the ball has to be in order to shoot that one? But also how fast it would shoot?
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    Post by Geezer Sat Jul 27, 2019 7:47 am

    Velocity is limited by spring-recovery spring.  If it's steel, probably somewhere around 200 fps. Geezer.
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    Post by Geezer Sat Jul 27, 2019 7:50 am

    A more poweful bow doesn't necessarily move its limbs any faster, but it CAN push a heavier bolt.  Energy is 1/2 mass X velocity.  If you can't substantially increase the velocity, you can increase the projectile weight.  Steel doesn't make a terribly efficient bow, but a good one lasts a long time. There are lots better/faster spring materials, but some of those don't last very long.  Geezer
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    Post by Andy. Sat Jul 27, 2019 5:21 pm

    The short power stroke on those pellet bows would also moderate mv.

    At some stage when time allows lol, I intend to make a "slingshot rifle" (not J. Sprave inspired), with a tri railed barrel of sorts, light sled system and long power stroke.
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    Post by Geezer Sat Jul 27, 2019 6:33 pm

    Ooops, my error, the formula is:  Energy equals 1/2 of max X velocity squared.  Higher velocity really pays off here, but if you can't increase that substantially, going to a heavier projectile still helps a lot. Heavier projectiles with similar shape and cross section will carry further and hit harder.
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    Post by Gnome Sun Jul 28, 2019 7:05 am

    Wow, haven't been on the forum for a while, its great to see so many ideas bouncing around!

    I haven't yet built a bullet bow, but I have given it some thought and a bit of research. I made a fletchless-bolt firing slurbow and think that the next logical progression of the design is one that fires bullets. I highly recommend Richard Middleton's book "The Practical Guide to Man Powered Bullets" if you are contemplating a slug-tosser. His focus is mainly air guns, but he does spend time with crossbows and slingshots, and takes a pretty scientific approach that can help tinkerers like us from trying to completely reinvent the wheel.

    Looking forward to seeing what you come up with, Banuvatt.
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    Post by banuvatt Sun Jul 28, 2019 10:36 am

    I understand that steel is heavy so the more powerful you make it also comes with the more mass you have to have.

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