Introduction
The concept of high speed, just like many other things in life is not absolute. Gabrielli and Von Karman pointed out the difficulty of measuring the value of speed for a considerable number of airborne and ground systems (1950). One result of their analysis was a chart on speed versus power established in a double logarithm plot (the Gabrielli-von Karman chart). It was found that all systems lie above this curve and at their most efficient points does the vehicles touch this line. More recently, Lorentz developed a general power scaling technique for airplanes and Helicopters. Manufacturers quote a Continue reading...