| 摘要 |
A helicopter rotor having retractable blades each having a three dimensional truss including flexible cables which connect a blade member with a pitch member directly secured to a rotor hub, the cables providing for retraction of the blade member to a storage position and permitting the blade member to be adjustably extended to operative positions. With the rotor rotating normally, the resultant centrifugal force acting on the blade and more particularly the blade member, retains the cables under sufficient tension to form an operationally rigid truss which transmits the rotational force of the rotor to the blade member and also adjusts the pitch of the blade member responsive to operation of the pitch member. Two pairs of cables are provided, inner ends of each pair being spaced apart and retained by the pitch member, opposite ends of each pair being secured, one to each of opposite ends of a rigid rod transverse to the blade member and extending outwardly in opposite directions from the blade member. Thus, four triangular truss parts are provided, each truss part including a pair of cables and either the pitch member or the rod on the blade member, with the flexible member intersections connected either with an end of the rigid rod or retained by the pitch member.
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