quote:
Originally posted by Coach_May:
Some say its going to hurt the power guys because they won't be dropping as many bombs. One could argue its going to hurt the guys that can't drop bombs now more. If a kid can't drive it with the juiced bats what's he going to do with the new ones?
Well, soon enough the bats will be in use, and then we can argue about what we
do see rather than what we
expect to see.
However, I think the expectation is that the new BBCOR standard will reduce distance for all batters, but it will hurt the bomber's distance more.
At first glance, we might think that if the new bats produce 360 feet compared to 400 feet for the BESR bats (90%), then the same 90% factor would apply to all hits, and 300 feet would become 270 feet, and a bunt of 20 feet would become a bunt of 18 feet. But actually the two bats will produce almost the same bunted distance, and the 300 feet hit will become perhaps 280 feet.
Baseballs are not very elastic, meaning that when hit, the ball deforms but doesn't spring back without loss of energy. If we drop a baseball and a super ball (or pumped up racket ball), the baseball doesn't rebound very high, but the super ball will come back up to almost the height it was dropped from. If the baseball strikes a rigid (e.g. concrete) floor at speeds up to about 30 mph, it will rebound to about 60% of the drop height or 60% of the impact velocity. At 100 mph, the rebound velocity drops to 50%, and at 135 mph it is about 45%. (Figures from Robert Adair, who relies in part on Brigg's measurements. By the way, the ratio or rebound velocity to incident velocity is termed the Coefficient of Restitution, which is the COR in BBCOR.) The dropoff in percent of rebound height comes about because the ball is progressively more deformed at higher impact speeds, and a bigger volume of the ball is experiencing the internal friction that eats up rebound energy.
Hollow bat barrels act like a spring, and the ball deformation is decreased compared to a solid core (e.g. wood) bat. The bat barrel rebounds elastically, meaning that very little energy is lost to internal friction within the bat. This trampoline effect is why hollow bats hit the ball farther. And the trampoline effect helps the power hitters more than weaker hitters, because without the trampoline effect, high impact velocities yield a less efficient transfer of energy into the rebound.
The new BBCOR standard reduces the trampoline effect, and power hitters will lose more than the guys with slower bat speed.