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Practical Coilgun Design |
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How to Measure Speed
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Setting Up the PendulumThis page is reproduced from "Backyard Ballistics" by permission of William Gurstelle. Setting Up the PendulumRefer to the ballistic pendulum assembly diagram. Suspend the pendulum from a ledge or ladder as shown. The general idea to keep in mind is that the cannon (or mortar, catapult, etc.) will be shot point-blank into the ballistic pendulum. The pendulum will swing after the projectile collides with it. When the projectile is fired, its momentum is transferred to the pendulum and its velocity can be determined from the height to with the pendulum rises. It is important that the box swings freely after colliding with the projectile. As it swings, the marker will trace out the path of the box on the paper that is attached to the plywood board, marking the pendulum's highest and lowest points. The difference in height between the apex of the swing and the rest position allows us to determine the speed of the projectile. Determining Muzzle Velocity
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Last Update 2008-06-09
©1998-2023 Barry Hansen |