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Ultra high powered slingshot crossbow


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Old 10-20-2016, 07:12 AM   #11
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Well, you are already getting the momentum of a .45 ACP round, at 2,9 Ns. Energy isn't everything! Great work.

The only problem with rubber based crossbows is the hysteresis effect... after four hours in the tree stand with the crossbow fully cocked, the performance will be much, much lower. Plus also the poor performance in cold temps.
The performance is decreased even after a few seconds. That is annoying when you're making a crossbow. An 80 pound regular crossbow is by no doubt stronger than a sling-crossbow with the same draw weight. I discovered that when making my bullpup crossbow. It shot much slower than my 20 pound youth bow.
The poor performance in cold temperatures is annoying me like crazy. I won't be able to shoot outside until late May, when the air is hot enough not to freeze your fingers off. I'm looking forward to next year.


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Old 10-20-2016, 12:59 PM   #12
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Well, you are already getting the momentum of a .45 ACP round, at 2,9 Ns. Energy isn't everything! Great work.

The only problem with rubber based crossbows is the hysteresis effect... after four hours in the tree stand with the crossbow fully cocked, the performance will be much, much lower. Plus also the poor performance in cold temps.
Energy isn't everything is very true! Already the momentum of this destroys any .22. Of course, I came here because like you Joerg, I need more power! I would love to see if I can come close to the highest power crossbow on the market...the Scorpyd Ventilator Extreme. That beast puts out 173 ft-lbs and looses a 400 grain bolt at 440 fps.

Rubber hysteresis. A definite issue. Unless there was a 60 plus degree Fahrenheit day it would be a poor choice of weapon. But since this is capable of taking African game this might just work in the heat of Africa. I don't hunt so I would never find out, so this is only hypothetical. I personally just like how light of a weapon rubber based can be, and because it's rubber powered it's already self-dampening and very quiet!

As far as version 2.0, I have bearing sheaves coming in and I am going to begin the new trigger mechanism today. I may just go for the 70cm power stroke that RalphG used and see what I can get out with the same amount of rubber I am currently using.


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Old 10-26-2016, 05:35 PM   #13
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Small update on version 2: I am just completing a personal design of a bullpup trigger mechanism. This allows 3 inches (76mm) more draw length in the same overall length! The trigger components are 3/8" thick 6061 aluminum, with bronze sleeve bearings, and stainless steel standoffs. The side plates are 3/16" thick 6061 aluminum.


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Old 10-27-2016, 01:35 PM   #14
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Looking great.
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Old 12-09-2016, 09:14 PM   #15
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Hey do you you live in the UK?
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Old 12-10-2016, 09:23 AM   #16
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Hey do you you live in the UK?
I do not. I currently reside in western NY.


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