Ejection seat In Fighter Jets

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EJECTION SEAT MADE BY ABHINAV SINGH SHAKYA MECHANICAL-A 1329240004

Transcript of Ejection seat In Fighter Jets

Page 1: Ejection seat In Fighter Jets

EJECTION SEAT

MADE BYABHINAV SINGH SHAKYA

MECHANICAL-A1329240004

Page 2: Ejection seat In Fighter Jets

In aircraft, an ejection seat (or ejector seat) is a system designed to rescue the pilot or other crew of an aircraft (usually military) in an emergency.

Once clear of the aircraft, the ejection seat deploys a parachute.

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G-FORCE• g-force (with g from gravitational) is a measurement

of the type of acceleration that causes weight. • Since g-force accelerations indirectly produce

weight, any g-force can be described as a "weight per unit mass"

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More about g-force

• The term g-force is technically incorrect as it is a measure of acceleration, not force.

• g-force accelerations ("g-forces" for short) are often expressed as a scalar, with positive g-forces pointing downward (indicating upward acceleration), and negative g-forces pointing upward. Thus, a g-force is a vector acceleration.

• An average human can bear G-force of about 5 , while pilots can bear it as high as 9.

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• Fighter plane pilots wear anti-G suits to protect them from excessive G-force.

• Ejection seat also produces high G-force while ejecting from aircraft.

• G-force produced while ejecting is as high as 8 G.

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History of ejection seat• The modern layout for an ejection seat was

first proposed by Romanian inventor Anastase Dragomir in the late 1920s

• The design, featuring a parachuted cell (a dischargeable chair from an aircraft or other vehicle), was successfully tested on 25 August 1929.

• Early models were powered by compressed air in early1940s.

• In the early 1960s, deployment of rocket-powered ejection seats designed for use at supersonic speeds .

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How it works??• The "standard" ejection system operates in two stages.• First, the entire canopy or hatch above the aviator

(aircraft) is opened and the seat then occupant are launched through the opening.

• Modern aircraft uses Egress system for the ejection mechanism in which these two stages are confined as a single stage.

• The seat is propelled out of the aircraft by an explosive charge or rocket motor, carrying the pilot with it.

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Encapsulated Seat egress system

• These seats are enclosed in an air-operated clamshell.

• It permits the aircrew to escape at supersonic airspeeds and altitudes.

• These are specially designed in which pilot can control the plane even with the shell closed and the capsule would float in case of water landings.

• These are used in the B-58 Hustler and B-70 Valkyrie supersonic bombers.

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Zero-zero ejection seat• It is designed to safely extract upward and

land its occupant from zero altitude and zero airspeed.

•  It was developed to help aircrews escape upward during low-speed flight, as well as ground mishaps.

• It uses small rockets to propel the seat upward to an adequate altitude and a small explosive charge to open the parachute canopy quickly for a successful parachute descent.