Order No. 4451 Fuselage kit Order No. 4451.K ... - Graupner
Order No. 4451 Fuselage kit Order No. 4451.K ... - Graupner
Order No. 4451 Fuselage kit Order No. 4451.K ... - Graupner
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UNI-STAR 60<br />
blade to fall. The rotor head is fitted with what is known as a flapping hinge to allow this<br />
movement, and this prevents the rotor plane tilting excessively in forward flight. In model<br />
helicopters a single hinge shared by both blades has proved a good solution to the problem.<br />
8.10 Auto-rotation<br />
This term refers to a helicopter flying without motor power. The rotational speed of the main<br />
rotor can be kept high by setting both blades to negative pitch, and the airflow through the rotor<br />
as it descends then keeps the blades turning. The rotational energy stored in the rotor by this<br />
means can be converted into upthrust when the helicopter is close to the ground, by the pilot<br />
applying positive collective pitch. Of course, this can only be done once, and it has to be done at<br />
the correct moment. Auto-rotation allows a model helicopter to land safely when the motor fails,<br />
just like a full-size machine.<br />
However, auto-rotation places considerable demands on the pilot’s judgement and reflexes; you<br />
can only halt the machine’s descent once, and you must not "flare" too early or too late. Much<br />
practice is required to get it right.<br />
20
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