Fighter aircrafts have the jet engines buried inside the fuselage

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Discussion Overview

The discussion centers on the design choice of fighter aircraft having jet engines buried inside the fuselage rather than mounted on the wings, exploring the implications for performance, maneuverability, and operational efficiency.

Discussion Character

  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants suggest that fighter jets require a smaller profile to enhance stealth and reduce radar visibility, which is facilitated by placing engines within the fuselage.
  • Others argue that the placement of engines inside the fuselage contributes to a smaller moment of inertia along the longitudinal axis, thereby increasing maneuverability.
  • It is proposed that having engines on the wings would complicate missile deployment, as wing-mounted missiles would require additional mechanisms for release.
  • Some participants mention that fighter jets typically use low bypass turbines, which have a higher specific fuel consumption (SFC) compared to the high bypass engines used in commercial aircraft, making them less suitable for wing mounting.
  • A participant raises a concern about the turning circle of the aircraft, suggesting that engines mounted on the wings would hinder agility during combat maneuvers.

Areas of Agreement / Disagreement

Participants express various viewpoints regarding the advantages of engine placement in fighter aircraft, with no clear consensus on the primary reasons or implications of this design choice.

Contextual Notes

Some claims rely on assumptions about the operational requirements of fighter jets versus commercial aircraft, and the discussion does not resolve the technical specifics of engine performance or aerodynamics.

EngTechno
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Unlike commercial airplane, many fighter aircrafts have the jet engines buried inside the fuselage instead of in pods hung beneath the wings. Do you know why?
 
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Passenger planes, bombers, cargo transports, etc. need the space in the fuselage for cargo. For that reason, they place the engines on the wings.

The fighter jets generally need to go fast and be maneuverable. They also want to have a small profile to help avoid radar/guns/missiles. Additionally, it's easier to reload and launch missiles if they're based on the wings. You just drop them and away they go: no needing to worry about opening any doors or hatches.
 
The moment of inertia along the longitudinal axis is also kept small by placing the engine inside the fuselage, increasing maneuverability. Another benefit would be lower air resistance.
 
Off the top of my head, the fighters use low bypass turbines which have a much higher SFC than high bypass engines such as those used on commercial and transport craft, thus making them inappropriate for this type of use.
 
brewnog said:
SFC

Specific fuel consumption?
 
Yeah, sorry.
 
from my knowledge but don't quote me on this fighter jets have their engines closer to the fusalage because they need to have a smaller turning cicle so of the engines were on the wings it would mean that the plane has to put in more effort to turn as it has to move the engines round and so slow the plane down which as you probably know is not very helpful when having someone on your tail firing off missiles at you left, right and centre.



a day without sunlight...is like....well.....scary!
 

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