This Incredible Video Shows How F-15’s Variable-Geometry Air Intakes Work

F-15 air intakes


F-15 air intakes
A screenshot from the video by @rikizomisono. Within the field, a Boeing diagram of the peculiar F-15 air inlets design.

Right here’s a uncommon take a look at “magic” of the F-15 Eagle’s shifting air intakes.

The video on this put up is kind of exceptional: shot throughout a current rehearsals of the Gifu Air Base Air Competition (that may happen subsequent weekend), it reveals an F-15J of Flight Improvement and Experiment Wing of the JASDF (Japan Air Self-Protection Pressure), based mostly at Gifu, throughout a sequence of pitch-up/pitch-down maneuvers whose objective is to indicate the impact of the elevators.

The F-15’s air intakes are engineered in such a method the ramps can transfer up and down, in order to alter their angle throughout flight and provides the optimum air movement for the engines beneath the present mixture of airspeed, altitude, and throttle setting. The air intakes additionally embrace a diffuser ramp and a bypass door that transfer not solely to feed the compressor with the correct amount of air, but additionally to decelerate the airflow and make it subsonic earlier than it reaches the engine, thus stopping shock/stress waves on the compressor and keep away from stalls.

Whereas you will discover different movies of the air consumption ramp pivoting up and down, you not often get an opportunity to obviously watch it shifting so quick.

By the best way, you may watch one of many F-15J’s follow shows right here.

David Cenciotti is a journalist based mostly in Rome, Italy. He’s the Founder and Editor of “The Aviationist”, one of many world’s most well-known and skim navy aviation blogs. Since 1996, he has written for main worldwide magazines, together with Air Forces Month-to-month, Fight Plane, and plenty of others, protecting aviation, protection, conflict, trade, intelligence, crime and cyberwar. He has reported from the U.S., Europe, Australia and Syria, and flown a number of fight planes with totally different air forces. He’s a former 2nd Lt. of the Italian Air Pressure, a non-public pilot and a graduate in Laptop Engineering. He has written 5 books and contributed to many extra ones.


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