This presentation summarizes stealth technology used in fighter aircraft. It discusses the history of stealth beginning with German submarines in WWII. The key aspects of stealth technology are reducing radar, infrared, and acoustic signatures. This is achieved through aircraft shape designed to deflect radar signals, radar absorbing materials, engine placement, and sound dampening. Current stealth fighters discussed include the F-22, F-35, and Sukhoi T-50. Future areas of research may utilize plasma stealth, infrared invisibility cloaks, and hypersonic flight. However, stealth aircraft have high development and maintenance costs.

1. A SEMINAR PRESENTATION ON
”STEALTH FIGHTER”
Presenter Name
Presentation Date
Submitted to
Mr. Deepak Gupta
Mr. Ravindra Chouhan
Asst. Professor
(Mech. department)
Submitted by
Abhishek vishwakarma
Roll no.- 12EGjME703

2. 1. INTRODUCTION
2. HISTORY
3. HOW TO MAKE THINGS INVISIBLE
4. PRINCIPLE OF STEALTH TECHNOLOGY
5. HOW TO REDUCE RADAR DETECTION
6. RADAR ABSORBING MATERIAL
7. REDUCING INFRARED SIGNATURE
8. REDUCING ACOUSTIC SIGNATURE
9.PLASMA STEALTH
10.LIST OF SOME STEALTH FIGHTER AIRCRAFT
11.FUTURE SCOPE
12.ADVANTAGE
13.DISADVANTAGE
14.CONCLUSION
CONTENTS -

3. 1. STEALTH IS A TECHNIQUE IN WHICH WE CAN MAKE
ANY OBJECT ALMOST INVISIBLE.
2. STEALTH IS AN IMPORTANT TECHNOLOGY WHICH IS
USED IN MILITARY OPERATIONS.
3. STEALTH TECHNOLOGY ALSO KNOWN AS LO
TECHNOLOGY (LOW OBSERVABLE TECHNOLOGY).
4. THIS WAS DEVELOPED MAINLY TO EVADE THE
RADAR DETECTION
5. THE FIRST STEALTH AIRCRAFT WAS DEVELOPED IN
GERMANY DURING LAST YEARS OF WWII
INTRODUCTION

4. HISTORY -
1. THE FIRST STEALTH APPLICATION WAS DEVELOPED IN
GERMANY DURING WW-2 IN GERMAN SUBMARINES WHEN
THEY USED RADAR ABSORBENT PAINT ON IT.
2. IN MID 1960’S, THE U.S. BUILT SR-71 BLACKBIRD,
THAT WAS EXTREMELY RADAR-STEALTHY FOR ITS DAYS.
SR-71 BLACKBIRD

5. 1.THE AIRPLANE CAN BE SHAPED SO THAT ANY RADAR
SIGNALS IT REFLECTS ARE REFLECTED AWAY FROM THE
RADAR EQUIPMENT.
2.THE AIRPLANE CAN BE COVERED IN MATERIALS THAT
ABSORB RADAR SIGNALS( ALSO CALLED AS RADAR
ABSORBING MATERIALS).
HOW TO MAKE THINGS INVISIBLE ?

6. PRINCIPLE OF STEALTH TECHNOLOGY
1. RADAR DETECTION.
2. INFRARED DETECTION.
3. ACOUSTIC DETECTION.
REDUCTION IN THESE DETECTION IS THE PRINCIPLE OF
STEALTH TECHNOLOGY.

7. HOW TO REDUCE RADAR DETECTION ?
MOST CONVENTIONAL AIRCRAFT HAVE A ROUNDED
SHAPE. THIS SHAPE MAKES THEM AERODYNAMIC, BUT IT
ALSO CREATES A VERY EFFICIENT RADAR REFLECTOR. THE
ROUND SHAPE MEANS THAT NO MATTER WHERE THE RADAR
SIGNAL HITS THE PLANE, SOME OF THE SIGNAL GETS
REFLECTED BACK.

8. A STEALTH AIRCRAFT, ON THE OTHER HAND, IS MADE UP
OF COMPLETELY FLAT SURFACES AND VERY SHARP EDGES.
WHEN A RADAR SIGNAL HITS A STEALTH PLANE, THE
SIGNAL REFLECTS AWAY AT AN ANGLE, LIKE THIS:

9. THE MATERIAL THAT IS USED TO PAINT
THE STEALTH CAN BE MADE OF SPECIAL
MATERIALS LIKE CARBON POWDER IN THE
GLUE OR SILICON BASED INORGANIC
COMPOUND THAT WOULD ABSORB THE
RADAR WAVES THAT FALL ON THE PLANE.
RAM IS BASICALLY PAINT WITH WHICH
EXTERNAL SURFACES ARE COATED WITH.

10. REDUCING INFRARED SIGNATURE.
1. HOT MATERIALS, SUCH AS ENGINE
EXHAUST GASSES OR WING SURFACES HEATED
BY FRICTION WITH THE AIR, EMIT MORE
INFRARED RADIATIONS THAN COOLER
MATERIAL.
2. EMBEDDING JET ENGINES INSIDE THE
WINGS IS ONE BASIC DESIGN STEP TOWARDS
INFRARED STEALTH.
3. OTHER MEASURES INCLUDE EXTRA
SHIELDING OF HOTTER PARTS, MIXING OF
COOLER AIR WITH HOT EXHAUSTS BEFORE
EMISSION

11. REDUCING ACOUSTIC SIGNATURE.
1.THE ENGINES OF THE STEALTH PLANES
SHOULD BE DESIGNED SUCH THAT THE NOISE
EMITTED BY THEM IS MINIMUM.
2.ENGINES SHOULD BE PLACED DEEP INSIDE
THE PLANE.
3.SLOW TURNING PROPELLERS WERE USED TO
MINIMIZE THE NOISE IN EARLIER DESIGNS TO
AVOID DETECTION BY ENEMY TROOPS.
4.INCORPORATING ACOUSTIC-STEALTH
MEASURES, INCLUDING SOUND-ABSORBENT
LININGS INSIDE ITS ENGINE INTAKE AND
EXHAUST COWLINGS.

12. PLASMA STEALTH
THIS AIRCRAFT INJECTS A
STREAM OF IONIZED GAS
WHICH ENVELOPES AIRCRAFT
DUE TO WHICH MOST OF
RADAR WAVES ARE
ABSORBED.
FOR SYSTEM TO WORK THERE
HAS TO BE SOURCE OF ENERGY
WHICH WILL IONIZE
SURROUNDING AIR.

13. LIST OF SOME STEALTH FIGHTER AIRCRAFTS
1. AMERICAN F-22 RAPTOR

14. 2. F-117 NIGHTHAWAK

15. 3. F-35 LIGHTNING II

16. 4. SUKHOI T-50 STEALTH FIGHTER

17. FUTURE SCOPE
1.HYPERSONICS- THE IDEA IS TO TRAVEL WITH M>5 TO
AVOID DETECTION.
2. THE INFRARED INVISIBILITY CLOAK: SHIELD ONE’S BODY
HEAT FROM INFRARED SENSORS, EFFECTIVELY MAKING
THEM INVISIBLE TO INFRARED CAMERAS.
3. PLASMA STEALTH TECHNOLOGY: ALSO KNOWS AS
ACTIVE STEALTH TECHNOLOGY USES PLASMA TO REDUCE
THE OVERALL RADAR CROSS SECTION OF AN AIRCRAFT.

18. ADVANTAGES
• REDUCES THE CAUSALITY RATES DURING WAR
• SAVING MILITARY BUDGET.
• DEVELOP THE MILITARY SECRETES
• BLUFF THE ANTI-DETECTIVE DEVICE
• STEALTH AIRCRAFT ARE INVISIBLE TO RADAR

19. DISADVANTAGES:
• HIGH MANUFACTURING COST.
• STEALTH AIRCRAFT CAN CARRY REDUCED
AMOUNT OF PAYLOAD.
• COST OF MAINTENANCE IS HIGH.
• DOES NOT PROVIDE THE OPTIMUM AMOUNT OF
LIFT.
• 1 BILLION = 1 ARAB IN INR

20. CONCLUSION
• UNDOUBTEDLY, STEALTH TECHNOLOGY IS THE FUTURE
OF MILITARY COMBAT AND AT PRESENT IS ONE OF THE
BEST TECHNOLOGY TO MAKE THINGS INVISIBLE AS FAR
AS POSSIBLE.
• BUT , THE MAIN PROBLEM WITH STEALTH IS ITS VERY
HIGH COST AND BECAUSE OF THIS, NOT ALL NATIONS
CAN ADOPT THIS TECHNOLOGY.
• SO WE NEED TO FIND WAYS TO REDUCE COST OR
ADOPT A DIFFERENT TECHNOLOGY WITH STEALTH LIKE
CHARACTERISTICS AND AT LOW COST (NANO
TECHNOLOGY).

21. THANK YOU

22. QUESTIONS