Jolietboy-
Not necessarily true. Velocity is a combination of a bunch of things. Most certainly a shorter pitcher can throw as hard or harder than a taller one (Billy Wagner at 5'9" threw as fast as Randy Johnson at 6'10"). It can be tougher for a taller pitcher to coordinate his movements as well as a smaller pitcher. Smaller pitchers often have an advantage in terms of efficient movements, quick twitch muscles and coordination (it can be easier to synch things up and accelerate a smaller body than a bigger one), while taller pitchers have an advantage in leverage, some times strength, and plane. That's why you see both tall pitchers and shorter pitchers being able to throw very hard (Kimbrel, Herrera, Holland, and Rodney all are 5'11" or under and can hit 100mph...and Collins who is 5'7" at best is in the upper 90s). It does help if the shorter pitcher is solidly built (muscle/weight-wise), to help power creation. See Collins' transformation: http://www.ericcressey.com/tim...n-at-least-for-a-day
As far as short D1 pitchers, I remember watching Nathan Kilcrease pitch in college for Alabama. He was 5'6" at best and was hitting over 90 mph, and was the ace of their staff. http://www.rolltide.com/sports...crease_nathan00.html