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# Helecopter

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### Helecopter

2. 2. History . Flying principle. Wing shape . Purpose of main rotor and Tail rotor How it moves in all direction . Conclusion .
3. 3. 1480: Leonardo Da Vinci sketches his flying machine. This was the first time that an aerial Screw is used for flying. His Machine is considered to be the first helicopter.
4. 4. 1800: Forlanini (Italy)Used steam Engine Counter-rotating “butterfly” wings Could ascend (without pilot) to 40 feet for about 20 minutes.
5. 5. 1907:1907: Cornu (France) First piloted Helicopter. Flew for few seconds Used internal combustion engine No controls but well balanced.
6. 6. 19331933:: The gyroplane laboratoire wasThe gyroplane laboratoire was the first practical helicopter.the first practical helicopter. This helicopter set new recordsThis helicopter set new records for height (158m), distancefor height (158m), distance (circle with 500m diameter), and(circle with 500m diameter), and
7. 7. Daniel Bernoulli principle Its states that where speed of fluid will be fast pressure will be low and where speed will be low pressure will be high.
8. 8. The wing are designed in such a way the upper surface is curved and lower surface is flat. Air flowing over the top surface travels faster than the air under the wing.
9. 9.  This cause the pressure of the air on the top of the wing to be lower, and therefore the aircraft is sucked up by this lower pressure.
10. 10. The curve surface is not Sufficient for lift . Pilot changes angle of attack (not >45) gives more pitch to the wing more air strike wing increase pressure under wing. Which cause lift.
11. 11.  The main purpose of rotor is to lift .When wing rotates in air the air above the wing is move faster as compared to below it increase the pressure below which cause for lift.
12. 12.  The lifting force is produced by the rotors. As they spin they cut into the air and produce lift. Each blade produces an equal share of the lifting force. .
13. 13. Spinning the rotor against the air causes lift, allowing the helicopter to rise vertically or hover. Tilting the spinning rotor will cause flight in the direction of the tilt
14. 14. When a helicopter mover along circular path it needs centripetal force which is also provided by main rotor .
15. 15.  The tail rotor is very important. If we spin a rotor using an engine, the rotor will rotate, but the engine and the helicopter will try to rotate in the_
16. 16. _opposite direction.  This is called torque action The tail rotor is used like a small propeller, to pull against torque reaction and hold the helicopter straight.
17. 17.  To take a turn toward left or right direction tail rotor is necessary because it is responsible for turn.
18. 18. Helicopter is very useful machine because it can move any direction even can suspend in air . It not need run way. It can be used for rescue and war process .
19. 19. Thank you