HISTORY
Early in the morning of 26
June 1950 a small red boat skipped across Lake Washington, near
Seattle, and improved on Campbell's record by 29 km/h (18 mph).
The boat was called Slo-Mo-Shun IV, and it was built by Seattle
Chrysler dealer Stanley Sayres. The piston-engined boat was able
to run at 160 mph (260 km/h) because its hull was designed to
lift the top of the propellers out of water when running at high
speed. This phenomenon, called ‘prop riding’, further reduced
drag.
In 1952 Sayres drove Slo-Mo-Shun to 287.25 km/h (178.49 mph) - a
further 29 km/h (18 mph) increase. The renewed American success
persuaded Malcolm Campbell's son Donald, who had already driven
Bluebird K4 to within sight of his father's record, to make a
further push for the record. However, the K4 was by now 12 years
old, with a 20 year old engine and Campbell struggled to run at
the speeds of the Seattle-built boat. In late 1951 K4 was
written-off when it suffered a structural failure at 170 mph
(270 km/h) on Coniston Water. |