Apparent wind that measures wind speed in knots and wind direction in degrees relative to the heading of the boat. Modern instrumentation can calculate the true wind velocity when the apparent wind and boat speed and direction are input. In sailboat racing, and especially in speed sailing, apparent wind is a vital factor, when determining the points of sail a sailboat can effectively travel in. A vessel traveling at increasing speed relative to the "prevailing wind" will encounter the wind driving the sail at a decreasing angle and increasing velocity. Eventually, the increased drag and diminished degree of efficiency of a sail
Speed of the Wind Speed of the Wind Speed of the Wind was a record-breaking car of the 1930s, built for and driven by Captain George Eyston. The car was designed by Eyston and E A D Eldridge, then built by the father of Tom Delaney It was powered by an unsupercharged version of the V-12 Rolls-Royce Kestrel aero engine. The car was too large and heavy for circuit racing and was already underpowered by the standards of the absolute speed record breakers. This car was designed for "endurance", more than peak power. Running a supercharged engine with the fuel and materials technology of