Air enters the inlet below the fuselage, slows and is compressed by ram pressure. After passing through the radiator, the heated air emerges at high velocity through an adjustable outlet. The resulting thrust helps offset the resistance of the duct and radiator, reducing the cooling drag to approximately 3 percent of total drag versus the 6 to 10 percent normally expected. In a turbojet, intake air is compressed and then heated in the combustion chamber before being expelled under pressure through the exhaust nozzle—in this case, because the temperatures and pressures are much higher, creating a net thrust.