Wards Essentials Trebuchet Kit, Material: High quality precision-cut Birch verner pure bond plywood, Designed to be safe and robust, Dry firings and heavy projectiles are no problem, Holes are pre drilled, Medieval weapons, engineering, and physics, Beam arm: 21in
Moment Of Inertia Disc On Magnet, 17.5 Cm Dia. Plastic Disc Mounted On Ball Bearing And Magnetic Base, Plastic Disc Dia. 17.5 Cm Mounted On Ball Bearing And Magnetic Base Perforated With Hole At 1 Cm Interval On 12 Axes At 30 deg. Supplied With 6 Moveable Pins.
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