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Howto:Fly a helicopter: Difference between revisions
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Explaining effect of lateral drift due to tail rotor thrust
(→Control hardware: Edited and added link to FGo!) |
(Explaining effect of lateral drift due to tail rotor thrust) |
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Transitioning from forward flight to hovering is easiest if you reduce speed slowly by raising the nose of the helicopter. At the same time, reduce the collective to stop the helicopter from climbing. As the helicopter slows, “translation lift” is reduced, and you will have to compensate by pulling the collective. When the speed is nearly zero, lower the nose to the position it was when hovering. Otherwise the helicopter will accelerate backwards! | Transitioning from forward flight to hovering is easiest if you reduce speed slowly by raising the nose of the helicopter. At the same time, reduce the collective to stop the helicopter from climbing. As the helicopter slows, “translation lift” is reduced, and you will have to compensate by pulling the collective. When the speed is nearly zero, lower the nose to the position it was when hovering. Otherwise the helicopter will accelerate backwards! | ||
You may wonder about that the heli banking to the side. Don't worry, thats normal for helicopters. Due to the thrust of the tail rotor and the fins which also prevents the effect of the main rotor torque, the helicopter is pushed to one side. The helicopter would drift laterally. So to keep the heli straight you have to counteract this effect. That means you have to steer the helicopter so that you don't drift away- so bank the heli against the drift. The more tail rotor thrust you give, the more banking you will have like hovering. | |||
In cruise the fins will take over more and produce the same effect. | |||
The side of the banking depends on the direction of turn of the main rotor: Counterclockwise --> left banking. Clockwise --> right banking. | |||
That's the reason why on modern helicopters like the EC135 the attitude indicator is even mounted with a bank on the panel. | |||
== Back to Earth I == | == Back to Earth I == | ||