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How do helicopters maintain a certain rotor pitch?

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Chlomo

Well-Known Member
Joined
Oct 8, 2014
Messages
120
Location
Seoul
On rotors of large complex helicopters I'm sure there are hydraulic devices that hold the required pitch as dictated by cyclic input by the pilot. Anyone care to share how that works mechanically? Especially with the more modern non symmetrical airfoiled rotors.
How do rotor systems resist such twisting force?
Even curious are those small single place kit copters and they don't seem to accommodate large space for hydraulic machinary.. Since their rotors are mostly symmetrical I assume an angle is needed to generate lift.

Those who are familiar with hydraulics please share with me! My friend Google tells me what hydraulic drift is but offers little explanation as to how they lock and transmit power in one direction only.
 
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