Encyclopedia entry: Park Avenue boom

Park Avenue boom, a main boom, first fitted to the American J-class yacht Enterprise , which successfully defended the America's Cup in 1930. The conception of the yacht designer Starling Burgess, it was triangular in section, 1.2 metres (4 ft) at its widest point with a wide flat top—so wide that two men could walk abreast along it, hence its name—and was fitted with a series of lateral rails about 46 centimetres (18 in.) apart along its length. Metal slides were sewn along the foot of the mainsail which fitted these transverse rails, and stops, which limited the movement of the slides, were fitted into holes on the rails. These stops allowed the foot of the sail, or ...

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