Sport touring motorcycle sportbikes were redefined (for marketing purposes) as sport touring bikes: the 2000 Kawasaki ZX-6R sportbike became the 2004 ZZR600 with just a change to a fairing bracket. Sport touring motorcycle A sport touring motorcycle (sometime a "sports-tourer") is a type of motorcycle that combines the performance of a sport bike with the long-distance capabilities and comfort of a touring motorcycle. The first sport-tourer is said to be the fully faired 1977 BMW R100RS. Journalist Peter Egan defines the sport-tourer as a "café racer that doesn't hurt your wrists and a touring bike that doesn't feel like a tank," and identified
Propeller zero slip in the water, whether this is a very large propeller or a huge drag device, approaches 100% Froude efﬁciency. The essence of the actuator-disc theory is that if the slip is deﬁned as the ratio of ﬂuid velocity increase through the disc to vehicle velocity, the Froude efﬁciency is equal to 1/(slip + 1). Thus a lightly loaded propeller with a large swept area can have a high Froude efﬁciency. An actual propeller has blades made up of sections of helicoidal surfaces which can be thought to 'screw' through the fluid (hence the common reference to propellers as