Head button

From RC Helicopter Wiki

The head button is a small plastic or metal disk that is mounted on the top of the rotor head above the mast.

The head button offers three functions:

• It can be pressed down on by the pilot after flying and while the engine of off or at idle to slow and eventually stop the rotor after flying. A similar effect can be achieved by applying full positive or negative collective pitch, increasing the drag on the blades.

• On a poorly set up helicopter, it can provide a limit to stop the washout base falling off the washout guide, by preventing the blade grips rotating and stalling the servos.

• On a well set up helicopter, it can bend the blade grip control arms in a crash.

Mostly they serve no positive purpose apart from looking nice, and are best left off.