Launcher machine design (Need Help!)

Hi all,

I'm going to design a ball launcher machine, but i've no idea where to start from..
this is the ball type: http://en.wikipedia.org/wiki/Sepak_Takraw

how do i judge the power and rpm required for the motor??
as i know, there is a initial velocity required for the roller, so the ball could achieve certain distance.

please enlighten me, thank you vey much =)

for this tennis ball launcher, the power required for the motor is 154W
http://www.ece.uvic.ca/~dwolowic/MechProgress.pdf [Broken]

so perhaps it has to be slightly higher than that, since the size and weight is bigger..

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