Originally Posted by JoergS
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.