All the numbers and joules thrown about have not yet brought the two camps together.
Perhaps this explanation may help clarify what makes people think there is energy released from the ski propelling them with a bounce-like effect.
--this is a dynamic carved short radius turn; at the very top of turn...
--the skis, light underfoot, travel out and away from the skier's body
--skis are tipped up on edge by the skier; they grip the snow while heading out, then begin turning
--skis move down the fall line, get loaded with the accumulating pressures, and bend more
--bent skis whip around quickly, tails following tips, turning back across the hill and bringing the feet back towards the body at speed
--skier feels heaviest build-up of pressure as the skis start turning back, at maximum bend, from the fall line
--the skis are still bent and loaded, clinging hard to the snow, as they bring the feet back towards the body
--this quick-turning-around brings the feet back fast enough to feel like there is a trampoline beneath the skis propelling the feet up with a bounce. Worth repeating: the skis are still bent; the skis, boots, and feet are still solidly attached to the snow. No release of energy from an unbending ski has occurred; no bounce has occurred.
--before too many nano-seconds pass, you (if you so choose at this time) begin flexing to release; your muscular flexation sucks up that heavy pressure
--the skis unbend and start tracking a straighter line because you intentionally suck up the accumulated pressures that were bending them
--skis travel lightly back across the snow because of your muscle action in the release; you have not actually felt a propelling force from the skis, but it sure seems like you have.
--you are feeling something you just created: the reduction of the accumulated pressures and the end of the turning-back-at-cha movement. The bounce is an illusion.
--if the skis are stiff, this illusionary trampoline sensation is stronger than if the skis are not so stiff.
We feel something we call rebound; it's an actual sensation, but it isn't a bouncing effect from the skis. The illusion of bounce/rebound is created by the skis' turning path, the pressures accumulating out at the fall line, and from the reduction of those pressures we make happen with our muscular release.
Edited by LiquidFeet - 5/16/13 at 11:23am