by DunninLA » Tue Sep 08, 2009 1:49 pm
Hookem74 --
There are mathematical equations (Physics) that define how fast a ball will exit a bat, with the two primary variables being bat speed and bat weight (and some other variables about the mass (weight) at different parts of a bat).
As I recall, bat speed is twice as important as bat weight. Of course the easiest way to tell is to set up a pitching machine at the average pitch speed of your age group -- let's call it 40 mph at 10u, and swing the same bat at -12 and -10.
My gut tells me that the lighter weight will get the job done better for girls of average strength and weight... that the increased bat speed and control outweigh the benefits of a heavier bat.
My DD at 10U swung a 31/19. The next year she went up to 31/21. Sometimes she swings now a 31/22. Practicing off the tee and soft toss into the net, she swings a 33/24 to build strength. If she gets stronger and can control the weight and keep up her batspeed, like most Olympic softball players, she'll move to a -8. (32/24 or 33/25)