Abstract des Autors

Given a basic understanding of exercise physiology, it is possible to anticipate or calculate the needs and performance of the engine of a human-powered vehicle. This was illustrated by the carefully planned Daedalus flight, in which efficiency and consistent power were essential. Much heat must be dissipated during prolonged operation of any HPV engine because it is only 20% to 25 % efficient. This is a different problem for HPVs that operate in cold weather or in water than for those in warm conditions, but all HPVs must be carefully designed to maintain proper temperature of the human engine. The heat-removal capacity of the air around a moving bycyclist at most speeds on the level is such that much more heat can be lost than the amount produced by the rider's effort. Hence, if an HPV has a streamlined enclosure or fairing, only a portion of the air moving around the HPV is needed for ventilation, which should be variable so the rider can remain comfortable and efficient under different conditions. Verf.-Referat