DEVICE FOR MEASURING VELOCITY HEAD ON HELICOPTER MAIN ROTOR BLADE Russian patent published in 2002 - IPC

FIELD: information and measurement systems of flying vehicles at subsonic speeds. SUBSTANCE: pressure differential sensor is connected with first pair of vent holes located at distance of (3-6)% of blade section chord from its leading edge on lower and upper sides in section of helicopter rotor blade where velocity head is measured. Second pressure differential sensor is connected with second pair of vent holes located at distance of (8-12)% of chord from leading edge in the same section of lower and upper sides of blade. Sensors are connected via amplifiers to input of adder shaping output signal proportional to velocity head and independent of angle of attack of blade. EFFECT: enhanced accuracy of measurement. 2 dwg