When I started flying airshows, back in 1971, the edge of the known aer-obatic world was a maneuver known as the lomcevak. The great-granddaddy of tumbles, the lomcevak (pronounced "LAHM-sha-vock") took you to a wild place, where one minute the air under your wing was solid as a fist, and the next you were toppling tailwheel over nose cone into the abyss, as out of control as an unhinged car on a Ferris wheel.
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