Published February 28, 2011 | 
Some nerveless Ballista image:
Ballista
The ballista was the briny gun weapon of the army. It was a two armed torsion catapult which threw stones in a relatively field flight.
Lego Ballista 3
Lego Ballista plan conception. Use NXT motor to tighten hostility on rope. This first design has a little too much friction for the motors when they attempt to crook both turntables. Idea is to exercise the light detector to control whether to fasten or loosen rope and later ADHD motor commanding for controlling the height of the platform.
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