Definition
The partial recovery of pressure lost across an aircraft's air intake, caused by the forward motion of the aircraft compressing incoming air. This recovered pressure raises the effective inlet pressure of the engine or system, partially offsetting losses due to intake design or altitude.
Plain English
As an aircraft moves forward through the air, the air gets pushed into the intake and gains a little extra pressure. RAM recovery is the amount of that lost pressure the intake gets back because of the aircraft's forward speed.
Context Anchor
Seen in turbine engine performance discussions, especially when airspeed affects engine thrust.
Derivation
From 'ram,' meaning to force or push something into a space. The forward motion of the aircraft 'rams' air into the intake, recovering some of the pressure that would otherwise be lost. 'Recovery' here means regaining something that was lost — in this case, intake pressure.
Why Pilots Care
Higher ram recovery improves thrust and fuel efficiency at speed, directly affecting climb performance and range.
Grounding Statement
Picture air being pushed into the front of the engine as the airplane moves forward; the faster the airplane moves, the more pressure can build at the inlet.
Intuition Check
RAM does not mean computer memory here. It means air being forced into an opening by the airplane’s forward motion. Recovery does not mean fixing a failed engine; it means gaining useful pressure from that moving air.
Example Sentence 1
At higher cruise speeds, RAM recovery increases the pressure of air entering the turbocharger, slightly improving engine output.
Example Sentence 2
During the climb the pilot accounts for improving ram recovery as airspeed builds.