FLEXIBLE SPAR FOR BEARINGLESS UNIT OF HELICOPTER MAIN ROTOR

摘要

FIELD: aeronautical engineering. SUBSTANCE: spar has six areas in span: area 12 of attachment to hub; first narrowing area 14; second narrowing area 16; pitch area 18; narrowing outer adapter area 20 and area 22 for attachment to tubular structure according to torque of propeller blade. According to this version, spar is made from continuous unidirectional glass fibre at orientation of fibres of 0 deg, unidirectional layers of glass fibre of varying length at orientation of fibres of 0 deg and transversal graphite fibres at orientation of fibres of <EMI ID=0.362 HE=3 WI=3 TI=CHI>45 deg. Spread position of ends of layers (fibres) ensures relatively smooth propagation of impact loads in spar into laminated structures. EFFECT: enhanced ballistic resistance. 3 cl, 4 dwg