Testo pagina:
Ignoratele, ancora non hanno capito che TUTTI gli aerei che volano sono tanker clandestini
According to a previously established thermodynamic theory, contrails are expected to form at a threshold temperature that increases with the overall ef ciency of the aircraft propulsion. As a consequence, aircraft with modern engines, with higher overall ef ciency, cause contrails over a larger range of cruise altitudes. To validate this theory, an experiment was performed in which contrail formation was observed behind two different fourengine jet aircraft with different engines ying wing by wing. Photographs document the existence of an altitude range in which the aircraft with high engine ef ciency causes contrails whereas the other aircraft with lower engine ef ciency causes none. For overall ef ciencies of 0.23 and 0.31 and an ambient emperature lapse rate of 12 K km¡ 1, the observed altitude difference is 80 m. This value would be larger (200m) in a standard atmosphere with smaller temperature lapse rate (6.5K km¡ 1 ). In a standard atmosphere, an increase of overall ef ciency from 0.3 to 0.5, which may be reached for future aircraft, would cause contrails at about 700 m lower altitude.