From RC Helicopter Wiki
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The head button offers four 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.
- It makes inverted landings possible by balancing the helicopter on the headbutton until the blades slows down.
Mostly they serve no positive purpose apart from looking nice, and are best left off.
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