stealth aircraft technology

19
STEALTH AIRCRAFT TECHNOLOGY A TECHNICAL SEMINAR ON

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Page 1: stealth aircraft technology

STEALTH AIRCRAFTTECHNOLOGY

A TECHNICAL SEMINAR ON

Page 2: stealth aircraft technology

INTRODUCTION • STEALTH “evading undetected”

• STEALTH TECHNOLOGY also known as LOT , it is a combination of technologies used to incorporate stealth for defense purpose.

• STEALTH IN AIRCRAFT making it difficult for radar and IR to detect or spot.

• Also USED in missiles , ships , submarines .

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HISTORY

• Prehistoric cavemen used leaves and mud during hunting.

• 1900’s concept of camouflage – aircrafts and ground units , radar technology was developed

• 1945 Hornet ho 229 used carbon powder coat to absorb radiation.

• 1971 Lockheed martin took up the model developed by Petr Ufimtsev ,made a program named ‘ECHO’. Built F-117 and B-2 bomber.

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RADAR & Its Principles• RADAR Radio Detection And Ranging. • ECHO study of waves bouncing of the

surface and coming back to source.

– Helped in studying the signature of the aircraft.– Could detect time and distance of target.

• DOPPLER SHIFT study of waves that are reflected back with varying frequencies.

– Helped in detecting the speed of the target.

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“A stealth aircraft has to be stealthy in 5 disciplines: radar, infrared, visual, acoustic and smoke and contrail. If you don't do that, you flunk the course.”

~BEN RICH

LOCKHEED MARTIN F-117 ‘ NIGHT HAWK ’

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TECHNIQUES USED TO ACHIEVE STEALTH

• RADAR CROSS SECTION REDUCTIONS (RCS)

– PHYSICAL SHAPE OF AIRCRAFTS (RAS).

– RADIATION ABSORBING MATERIALS (RAM).

• ACOUSTICS

• INFRARED

• VISIBILITY

• PLASMA

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• PHYSICAL SHAPE OF AN AIRCRAFT– EDGES WERE MADE SHARP

– TAILS ARE THE MAIN SOURCE OF DETECTION.

– INTERNAL HOUSING OF MISSILES AND LANDING GEARS.

• RAM– USES SPEACIAL SURFACE COATINGS TO ABSORB AND

REDIRECT THE INCOMING WAVES

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B-1B LANCERVERTICAL TAIL (90 DEGREE)

F-117V-TAIL (BETTER STEALTH)

B-2 BOMBER NO TAIL

(STEALTH)

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F-18 SUPER HORNET EXTERNAL MISSILE HOUSING

F-22 RAPTOR INTERNAL MISSILE HOUSING

STEALTH

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ACOUSTICS USES SPECIAL TYPES OF WINGS AND NOZZLES TO REDUCE OR MODIFY SOUND JET ENGINES REPLACED BY LOW SPEED TURBOFAN OR TURBO PROP

VISUAL STEALTH

Bird shaped vehicles .

Camouflage with sky .

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• IR: Infrared– Aircrafts heat signature – Mainly at nose tip , air intake , missiles and exhausts.– Engine placements are crucial – Top secret technology

THERMAL IMAGING – HEAT SIGNATURE

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B2 STEALTH BOMBER AIR INTAKE AND EXHAUST

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• PLASMA STEALTH– used as an “active stealth” – Injects a stream of plasma around its body.– Absorbs most of the EM waves of the radar. – First developed by Soviet Russian Space program.

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ADVANTAGES OF STEALTH

• Reduces the causality rates during war

• Saving military budget

• Develop the military secretes

• Bluff the anti-detective device

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ISSUES WITH STEALTH • Stealth aircraft cannot fly as fast as conventional

aircraft• Dog fight ability• Can carry limited amount of load• Not very economic B-2 cost [ $2 billion ]

F-22 [$100 million]• Wing shape does not provide the optimum the lift.• Vulnerable modes of flight.• Electromagnetic emissions.

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CONCLUSION

• The development of stealthy airplanes teaches several important lessons about technology.

• It is a combination of technologies.

• It also teaches that trail and error method is just not sufficient in this case .

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REFERENCE

• http://www.seminarprojects.com/Thread-stealth-technology-in-aircraft-full report#ixzz1GycFXQtW

• en.wikipedia.org/wiki/ Stealth_technology

• science.howstuffworks.com

• www.encyclopedia.com

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THANK YOU