Rotor blade recorder system
 A rotor blade recorder system for accumulating the total number of hours that the rotor blades of a helicopter have been rotating at operational speeds. An hour meter and a switch are attached to the outer surface of a mounting rod running through the root end of each of the two blades comprising the main rotor. The switch has a calibrated weight at the end of the switch arm to close the contacts of the switch when the main rotor reaches operational speed. Closing the contacts energizes the self-contained power source in an hour meter. Remote readout terminals permit the hour meter to be read from outside without disturbing the blade assembly. As long as the rotor continues at the operating speed, the hour meter continues to record the time at work. 
B
B64C
inventional
Jamie R.
Hill