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That depends on type of helicopter
sorry folks, its 12 cms
The rotors are used for lift and thrust on a helicopter.
Reduce collective will reduce the lift and the helicopter will begin to descend. Reducing the throttle will also reduce the RPM and result in descent of the helicopter. With less torque, the helicopter will begin to spin so the rudder pedals will have to be adjusted to reduce the amount of tail rotor thrust.
Pushing Air downwards to fly. Rapidly spinning long, thin blades push air downwards to lift the helicopter up
the difference between an helicopter creating lift and an airplane creating lift is simple. an airplane creates lift by moving forward and its wing that has an aerofoil shaped will create lift. this gives the lift for the airplane and to fly. for helicopters, instead of the aerofoil is fix like an airplane, the aerofoil wing is rotating and create lift. that is why the helicopter does not need to move forward to gain momentum to create lift. by rotating the aerofoil (the blade) the helicopter can creates enough lift to lift up the helicopter.and that's how it fly..
Ranges from 250 to 450 rpm.. If there is need to increase the speed then the rpm is eventually increased as per the need
Lift, thrust, drag, and gravity affects all flying objects and wildlife. The blades of the helicopter provide lift, drag and thrust.
Spinning wings create lift to make helicopter fly.
3,000,000 cents
It produces lift and thrust in different ways.
Flying a helicopter is a delicate balance of Rotor RPM and Rotor Torque. Too little RPM and it would lose lift. Too much RPM, then the centrifugal forces could damage the rotor blades. When the pilot adds Collective input to climb, the Rotor Torque could be exceeded and result in failure of the mast. Each flight restriction was based upon the design of the helicopter's mast, blades and grip. Also, if the RPMs are too high the tips of the blade will hit the sound barrier and vibrate out of control. A helicopter with a blade length of 30 ft (radius) will only have to be spinning at around 330 RPMs to reach the sound barrier.