Craig Turner built a mechanized whip-cracking launcher that produces a supersonic tip velocity, reliably generating a sonic boom on every trigger pull. The device uses a hand-assembled tapered whip, a length of elastic shock cord, an electrical-conduit guide rail, and a spring-loaded release mechanism. It cracks every time, no skill required.
The whip itself is the real engineering story. Turner joined a series of progressively thinner, lighter ropes to replicate the taper geometry of a bullwhip. When released, conservation of momentum accelerates each successive lighter section faster than the last, driving the tip past the speed of sound. The crack is not a snap of contact, it is a small-scale sonic boom. The finished machine can slice leaves, tear open aluminum cans, extinguish candles, and decap a bottle without tipping it.
Turner flags the obvious next application: pair this repeatable, controllable crack with a schlieren imaging rig to visualize the supersonic shockwave directly. The full build breakdown on his site covers the whip construction geometry and trigger mechanism in detail worth reading before anyone attempts to replicate it.
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