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Tri-star (wheel arrangement)

A Tri-Star wheel assembly rotating through a hole

The tri-star is a novel wheel design—originally by Robert and John Forsyth, assigned to Lockheed in 1967—in which three wheels are arranged in an upright triangle with two on the ground and one above them. If either of the wheels in contact with the ground gets stuck, the whole system rotates over the obstruction.[1]

  1. ^ US patent 3348518, Forsyth, Robert W & Forsyth, John P, "Amphibious star-wheeled vehicle", issued 1967-10-24, assigned to Lockheed Corp