OLYGEOS,discus thower by mongke.
main parts .
1 rcx
4 motors
1 light sensor
1 cd..!
The idea I had was to try to simulate the action of a discus thower rather then a discus shooter.
So i built a sort of spinning arm.
Using four direct drive motors to supply the torque needed to spin the robot,
 the bot spins up to speed causing the gyroscopic forces to increase.
Which in turn causes the cd to release its self ro the gripper.
The light sensor having sensed its release shuts off  olygeos`s motors in wait for another cd.
when a cd is inserted Olyegos waits 5 secs before stating the spin..
This insures no sore fingers.....
I tried using pnuematic releases but the added weight and complexity made it somewhat top heavy .
The three recorded distances were 68cm  71cm and 74cm. (lowest to highest) avrg. 71cm(2feet 4 inches)
so load it up, stand back and let it spin ...!
The simplicity of the design means it can be made using any parts you have as long as you watch the balancing point and the angles
of the CD gripper and arm geometry. Chanking the arms lenghth changes the distances thoenen but makes it harder to stop it flipping over during the spin.
so that about it.
play well have fun.
mongke