Blade pitch or simply pitch refers to turning the angle of attack of the blades of a propeller or helicopter rotor into or out of the wind to control the production or absorption of power.
Wind turbines use this to adjust the rotation speed and the generated power.
A propeller of a ship uses this effect to control the ship's speed without changing the rotation of the shaft and to increase the efficiency of streaming fluids.
In helicopters the pitch control changes the angle of attack of the rotor blades and thus the vertical acceleration or climb rate of the vehicle.
This control is also called collective as opposed to the cyclic control for lateral movement.
The collective blade setting is mostly achieved through vertical movement of the swashplate.
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