The technology has come a long long waybut I'm afraidit's at a point where it isn't too much farther to the intrinsic limit.There simplyaren't going to be any great advances in thevelocity/ke/momentum departmentin store for us. The thing to keep in mind is that the limiting factor is not the bow but rather the archer. We are physically limited as to how much energy we can store in the limbs of a bow. Given the maximum weight we can pull and the distance we can pull it there's only so much the technology can do to convert that effort into an arrow in flight. If for example we say the limit is 70 pounds and an archer can pull that weight back for a distance of 20 1/4 inches (That's 30" draw length and a brace height of 8") then he is capable of storing a maximum of 118.2 ft-lbs of energy in the limbs of the bow. No cam or pulley design can alter that limit. Right now, the technology has advanced to the point where a little over 80% of that energy will get transferred to a 350 grain arrow.A little more for heavier arrows. Even if we could advance to a technology that would transfer 100% (impossible of course) that arrow would leave the bow at only 390 ft/sec and of course be carrying 118.2 ft-lbs ke and .61 pound seconds of momentum.

No, I'm afraid given what weknow asarchery asholding the bow in one hand, and pulling the string with the other (1 pullbtw, no pumping) and given we need someclearance sowe don't slap the crap out of our bow arm (brace)there just isn't too much further to go without animprovement in the archerto increase his capacity.