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60

The nose design of aircraft, like any other part, is a result of optimization in response to a number of factors. The Mikoyan-Gurevich MiG-21 'Fishbed' is a supersonic, second/third generation Soviet fighter/interceptor. The first jet aircraft to enter serice during the WWII, the Messerschmitt Me 262 'Schwalbe' and Gloster Meteor had twin engines in their ...


39

A lot of early jet aircraft had the intake in the nose. Here's a few more examples: The cone in the front is required because the Mig-21 is a supersonic aircraft. The cone breaks the shockwave so that the inlet air is sub-sonic. The SR-71 is a very different type of aircraft but you can see that its engines have a very similar style of inlet:


35

The design philosophy which led away from the nose intake was to fit a powerful radar to the aircraft, which in turn was a consequence of switching from guns to air-to-air missiles as the primary armament of fighter aircraft. Most designs of the late Forties and early Fifties did not consider powerful radars in individual aircraft, but were based on ground ...


14

It is the intake of the jet engine which gives it that shape, a good number of earlier jet fighter planes did have that configuration. The pointed part is the shock cone for when the plane flies supersonic so that the shock would not mess with the aerodynamics of the plane especially inside the engine. Image by USAF


11

A lot of supersonic aircraft of the era had the same kind of intake, the English Electic Lightning off the top of my head: EE Lightning F6 'XS904 / BQ' by Alan Wilson is licensed under CC BY-SA 2.0 The cone is to slow down the supersonic airflow, so that the air is relatively calm when it goes into the turbine, which ensures a smooth burn. It's in the nose ...


9

Yes, it moves forward as the speed increases. Its purpose is "to slow the flow of air from supersonic flight speed to a subsonic speed before it enters the engine." From Wikipedia: The air flow to the engine is regulated by an inlet cone in the air intake. On early model MiG-21s, the cone has three positions. For speeds up to Mach 1.5 the cone is ...


9

To be extremely simple without going into too much technical design theroy. It allows the engine to breath at high speeds. You will notice that in front of a high speed fan or a cooler it will be extremely difficult for you to breath, try putting your head out of the car and breath when travelling at 60mph , it will be much more difficult to breath ...


3

I'm not an aircraft designer, but I'm pretty sure I've figured out the design philosophy that led to that nose. The aircraft has one engine, which is positioned along the aircraft's central axis. Since it's a jet engine, it needs an intake. The simplest intake design is a straight tube. Due to the positioning of the engine, this puts the intake's inlet ...


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