Patent ID: 9676478
Date: 2017-06-13
CPC Classifications: B60T,B64C

Claim:
1. A rotor blade rotation control master cylinder assembly for vertical lift aircraft, the assembly comprising: a master cylinder configured to be activated by movement of a rotor blade rotation control handle of a vertical lift aircraft to move pressurized hydraulic fluid through one or more conduits; a rotor brake actuator connected to the master cylinder and configured to engage a rotor brake of the vertical lift aircraft in response to receiving hydraulic fluid at a hydraulic fluid pressure from the master cylinder; a pressure relief valve fluidly connected in parallel to the master cylinder and the rotor brake actuator, and configured to transmit pressurized hydraulic fluid away from the rotor brake actuator in response to the hydraulic fluid pressure exceeding a pressure threshold of the pressure relief valve; and an isolation valve connected in series with the pressure relief valve, the master cylinder configured to push the hydraulic fluid at a first pressure to the rotor brake actuator in response to the isolation valve being open wherein the first pressure is selected to slow the rotor of the vertical lift aircraft, and to push the hydraulic fluid at a second pressure that is higher than the first pressure in response to the isolation valve being closed wherein the second pressure is selected to hold the rotor of the vertical lift aircraft.