HELICOPTER MAIN ROTOR BLADE Russian patent published in 2000 - IPC

FIELD: aeronautical engineering; helicopter main rotor blades with balance weights in end section. SUBSTANCE: blade has spar made from laminated composite materials, abrasive-resistant profile, tail section stack of balance plates. Balance plate stack is mounted inside spar by means of bearing pins, hold-down bushes and cover plates. Cover plates are located on side of upper and lower outer surfaces of blade. End section of spar has slot and detachable profiled insert. Slot is used for receiving balance plates. Detachable profiled insert is secured to spar over length of slot. EFFECT: increased size of plates; extended range of control of additional mass in balancing; enhanced strength and improved aerodynamic characteristics of blade. 5 dwg