Question:
I have hundreds of hours in SEL aircraft. I am not familiar with helicopters. When a helicopter is hovering how does the aircraft change its pitch in a stationary position? In other words lower the nose, or lower the tail? it couldn't be controled by ailorons or elevators could it, because there isn't any horizontal air flow over the control surfaces?
Answers:
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When the helicopter is hovering the fuselage is just hanging below it (since the rotor disc is free to move on the flapping hinges). A common mistake of student helicopter pilots is they try to control the fuselage attitude. You can only control the rotor and the fuselage is just along for the ride (except for directional control with the tail rotor).documents checked by ground staff and cabin crew of unaccompanied minor?
The cyclic control changes the angle of the rotor disc and the fuselage follows when movement is started. This is why the nose points down when helicopter starts to move forward, the rotor is dragging it behind.
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The horizontal stabilizers on tail keep the nose lower in forward flight to reduce form drag.
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its in the pitch of the main rotor blades
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The blades on the rotor can tilt as it rotates to make the copter change positions.Is controlled by the pitch, or AOA of the rotor blades, and the cyclic pitch on the control stick.
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A helicopter can change the angle and pitch of its rotor blades. If the blades tilt forward, the chopper goes forward, backward, the chopper goes backward, tilt left, go sideways to the left, tilt right, go sideways to the right. When the control inputs are at neutral and the helicopter is trimmed properly, it will hover. The normal attitude of a copter is to be moving forward at neutral input, so the blades are already tilted a little forward. The other thing is the tail rotor, which compensates for the torque forces of the main rotor blades, and also points the nose of the helicopter in the direction you want it to go.I don't think it can change its pitch while hovering (no wind). Once you rotate the blades and the helicopter moves, it will change its pitch.
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And there is horizontal air flow - its just that the blades are moving, not the whole craft.
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Look under the the blades those arms pitch up, down,left right moving the stick and foot pedals will slightly pitch the bladesThe Helicopter can hang and thrust forward but the plane can´t.Why?
An helicopter in hovering is usually with the nose higher and the tail lower, and to limit this fact that is not so comfortable for operations helicopters sometimes have the tail rotor with its axis not horizontal but inclined to the top, so a part of the force of the tail rotor help keeping the tail high, but the pilot can't modify this angle, it depends on the model and the position of its center of gravity respect the main rotor.More Questions & Answers ...
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