Hi ,
I just want to understand how the small ID rubber can replace the regular one and how much power needed or enough to let your spear hit the target at 5 meter with satisfactory results ,just did 2 studies ,first I take my south african rail gun and calculate the elongation ratio for the rubber as per the recommended by the manufacture and as I used it practically ,second I use primeline calculator to get the theoretical power , the attached picture may be won't be easy to understand cause I mix the pound , gram ,cm and inch but it show the force in pound we could get theoretically from specific rubber ,
south african gun can shoot 2*16mm at elongation 315% (force is 95-105 Ib) or 1*18mm at elongation 290% (Force is 55-60 Ib) ! using same spear 7mm length 170 cm ,I can replace the 16mm with 14.5mm small ID and elongation 360% to get the same power .
conclusion so it is more simple
why when I change from rubber size to bigger rubber size I can get the shoot at less power by same spear (as manufacture told me)?
I'm not expert but I just use what ever data came with both speargun and the rubber maybe I miss something here ?
I want to find a relation between the needed power and spear dimension or mass .
I hope my post is clear BTW I discuss this in another forum but not find the light .
