Slo-Mo-Shun IV hydroplane, built in 1929 and rebuilt in 1956
The Slo-Mo-Shun IV hydroplane (rebuilt with a model of the engine) brought unlimited hydroplane racing to Seattle with her Gold Cup win. The unlimited hydroplane is an example of aerodynamic design in boat building, and it is best remembered by the estimated 200,000 exhilarated spectators on Lake Washington's shoreline as it sped to a new world record in the 1951 Gold Cup Race. The race secured the ongoing popularity of Seattle's SeaFair festival, which was only in its second year in 1951. By the following year, enthusiastic citizens donated over $57,000 to a "Slo-Mo Fund" for maintenance and racing costs. Hydroplane mania became a local obsession and Slo-Mo put the city squarely in the center of the race boat circuit. The hydroplane is emblematic of Pacific Northwest invention and entrepreneurship as well as the region's strong interest in outdoor sports and recreation.
Physical Description: 2 Hydroplane; mahogany, oak, spruce, fiberglass, plastic, aluminum, steel; 7 ft. 8 in.H x 11 ft. 8 in.W x 30 ft.D (with tail fin attached), 6 ft.H without tail fin attached, 4500 lbs (weighed during move)
Place Made: United States of America, WASHINGTON, Seattle
Credit: MOHAI, 1959.1701. Gift of Mrs. Stanley Sayers, Slo-Mo Crew, Mr. and Mrs. R. Stanley Dollar, Mr. and Mrs. Edgar F. Kaiser
