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Floating arm trebuchet
The Floating Arm Trebuchet (F. A. T.) is a counterweight siege weapon which is a modern variation of the medieval trebuchet. The F. A. T. features free movement of an axle on the throwing arm,〔 and a linear drop channel for the counterweight. Floating arm trebuchet design and construction is a popular project assignment in post-secondary engineering classes.〔("The science of pumpkin chucking" ). ''Discover Missouri S&T'', February 12, 2013 by Mary Helen Stoltz〕
==Basic design==
A traditional trebuchet, which is simple to engineer, consists of an arm resting off-centre on an axle with a hinged counterweight at the short end of the arm.〔(【引用サイトリンク】url=http://www.trebuchet.com/firstfat )>〕 The difference in the lengths of the two ends of the arm provides mechanical advantage.
In contrast, a Floating Arm Trebuchet features a freely moving axle on the arm along a glide track.〔 This allows for a higher drop height for the counterweight,〔 which is allowed to fall down a linear "drop channel". The arm is on a moving axle and the torque is acting on the entire structure, preventing stalling. This linear drop of the counterweight is more efficient in transferring potential energy to kinetic energy then the pendulum counterweight motion of a traditional trebuchet.〔 The higher the drop channel, the more energy is released, but this puts more strain on the mechanism.〔(【引用サイトリンク】url=http://www.rose-hulman.edu/Catapult2008II/reports/group26.pdf/> )〕
The dropping of the counterweight forces the arm to swing to one side of the glide track and quickly jerk in the opposite direction to launch a projectile.〔 This pulls the counterweight upwards slightly after a launch.〔 The projectile can be launched at a high velocity.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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