New plans added on 11/20: Click here for 2,589 plans for homemade tools.
nova_robotics (Jan 30, 2022), Rangi (Jan 28, 2022)
Since I had to look it up. From Wikipedia: Shock diamonds (also known as Mach diamonds or thrust diamonds) are a formation of standing wave patterns that appear in the supersonic exhaust plume of an aerospace propulsion system, such as a supersonic jet engine, rocket, ramjet, or scramjet, when it is operated in an atmosphere. The "diamonds" are actually a complex flow field made visible by abrupt changes in local density and pressure as the exhaust passes through a series of standing shock waves and expansion fans. Mach diamonds are named after Ernst Mach, the physicist who first described them.
Altair (Jan 27, 2022), clydeman (Jan 27, 2022), corvette (Jan 29, 2022), Duke_of_URL (Jan 28, 2022), Jon (Jan 27, 2022), nova_robotics (Jan 27, 2022), Rangi (Jan 28, 2022), Tule (Jan 28, 2022)
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