HELICOPTER

UNLIKE MOST AIRCRAFT WHICH HAVE FIXED WINGS A HELICOPTER HAS A SPINNING ROTOOR WITH TWO OR MORE LONG THIN BLADES ATTACHED. WHEN THE BLADES SPIN ROUND, THEY LIFT THE HELICOPTER STRAIGHT UP INTO THE AIR.A HELICOPTER CAN TAKE OFF FROM ALMOST ANYWHERE AND DOES NOT NEED TO USE AIRPORT RUNWAY.IT CAN HOVER IN ONE PLACE, AND FLY BACKWARDS, FORWARDS AND SIDEWAYS.THIS MAKES IT THE MOST VERSATILE OF ALL AIRCRAFT, IT IS VERY IMPORTANT FOR TRANSPORT, SURVEILLANCE AND RESCUE MISSION.

FLYING CONTROL

A HELIICOPTER PILOT HAS THREE FLYING CONTROL.THE COLLECTIVE PITCH LEVER CHANGES THE AMOUNT OF LIFT PRODUCED BY THE MAIN ROTOR. THE CYCLIC PITCH CONTROL MAKES THE HELICOPTER MOVES FORWARDS, BACKWARDS OR SIDEWARDS, RUDDER PEDALS MAKES THE HELICOPTER TURNS LEFT AND RIGHT

LIFTING OFF

BEFORE TAKEOFF  THE MAIN  AND TAIL ROTORS ARE SPEEDED UP.WHEN THE MAIN ROTOR IS TURNING FAST ENOUGH THE PILOT LIFT THE COLLECTIVE PITCH LEVER TO INCREASE THE TILT OF THE ROTOR BLADES THE TILT PRODUCES LIFT AND THE HELICOPTER TAKES OFF THE HIGHER THE LEVER IS LIFTED THE FASTER THE AIRCRAFT RISES

MOVING AWAY

THE CYCLIC PITCH CONTROL MAKES THE HELICOPTER MOVES IN THE DIRECTION THE CONTROL IS PUSHED IT TILTS THE MAIN ROTOR SO THAT SOME OF THE ROTOR LIFT PULLS THE HELICOPTER ALONG. HERE THE PILOT HAS PULLED THE CONTROL BACK TO MAKE THE HELICOPTER MOVES BACKWARDS

INTERSTING FACTS

                                               IGOR IVAN SIKORSKY

SIKORSKY (1889-1972) WAS BORN IN UKRAIN WHERE HE BECAME AN AERONAUTICAL ENGINEER IN 1919 HE MOVED TO THE UNITED STATES WHERE HE SET UP AN AIRCRAFT FACTORY HE DESIGNED THE FIRST PRACTICAL HELICOPTER THE VS-300 WHICH FIRST FLEW IN 1939 THE DESIGN HAD TO BE MODIFIED MANY TIMES AT ONE POINT THE HELICOPTER FLEW IN EVERY DIRECTION EXCEPT FORWARD   

                                        Here the picture of first helicopter 

LEONARDO DAVINCI HELICOPTER MODEL 

INDIA FIRST  MAN TO FLY AN AIRPLANE