ram air pressure造句

• The airspeed is derived from the difference between the ram air pressure from the pitot tube, or stagnation pressure, and the static pressure.
• At around 450 km / h ( 280 mph ) most valved engines'valve systems stop fully closing owing to ram air pressure, which results in performance loss.
• Valveless designs are not as negatively affected by ram air pressure as other designs, as they were never intended to stop the flow out of the intake, and can significantly increase in power at speed.
• At some stage it was fitted with downward angled hydrofoils mounted to its floats with the aim of decreasing take-off speed, but they proved to have the opposite effect by decreasing the ram air pressure.
• The valveless pulsejet's first widespread use was the Dutch drone Aviolanda AT-21 A properly designed valveless engine will excel in flight; as it does not have valves, ram air pressure from traveling at high speed does not cause the engine to stop running like a valved engine.