Ball contact w/ bat on service

hey again Sirs Jeff and Alois..,

when I'm doing the pendulum and reverse pendulum serves, sometimes the ball goes too fast and sometimes slow, does the place of contact of the ball with the bat(top, center, near the handle) have anything to do with speed of ball? 

Hi Gian,

The main thing to do with speed is the type of contact of the bat on the ball.  If you get a thin brushing contact you will get the ball to move a little slower. If the contact is flat then the ball will go faster.

The position on the bat can influence the type of spin on the ball.