A pitch control system characterized by a hub (12) with at least two blade-housings (2) on the hub (12) that are disposed around the hub axis (40). The blade-housings (2) have corresponding blades (1) that engage with them. The blades (1) spiral along housing-longitudinal axis (41) toward and away from the hub axis (40) about a segment of helical path to effect a change in the pitch of each blade (1). One or more elastic members (3) draw the blades (1) toward the hub axis (40), either directly or indirectly. There are pitch mechanisms (4) effective to facilitate blades to spiral around housing-longitudinal axis (41). A blade (1) will spiral away from the hub axis (40) when the centrifugal force exerted on the blade (1) exceeds the opposing elastic force in the housing-longitudinal direction (neglecting other forces). Conversely, blades (1) spiral toward the hub axis (40) when said centrifugal force is less than said elastic force. There is an imaginary plane (42) orthogonal to the hub axis (40). Housing-longitudinal axis (41) have angles with respect to the imaginary plane (42) of not more than 30 degrees.
Pitch control system
2022-09-29
Patent
Electronic Resource
English
IPC: | B64C AEROPLANES , Flugzeuge |