Seesaw type fixed pitch propeller

Abstract

A seesaw type fixed-pitch propeller adopts two blades, the included angle between the two blades is 180 degrees, the pitch of the blades is fixed, the two blades and a propeller hub are connected into a whole and share a horizontal hinge, a flat through hole is formed in the middle of the propeller hub from top to bottom, and the through hole is communicated with the horizontal hinge. A driving shaft of the seesaw type fixed pitch propeller can penetrate into the flat through hole; a horizontal reaming hole is formed in the middle of the propeller hub, a shaft horizontal round through hole is formed in a driving shaft of the seesaw type fixed pitch propeller, a horizontal connecting shaft penetrates through the horizontal reaming hole in the middle of the propeller hub and is inserted into the shaft horizontal round through hole of the driving shaft of the seesaw type fixed pitch propeller, and the propeller hub is horizontally hinged to the driving shaft of the seesaw type fixed pitch propeller. The blades can swing up and down around the horizontal connecting shaft, in the blade swinging process, the lift force difference between the left forward blade and the right backward blade is reduced, the alternating bending moment of the roots of the blades is eliminated, the propeller is applied to a helicopter with multiple fixed pitch propellers, the service life of the blades is prolonged, and the horizontal flight speed is increased.

Description

technical field [0001] The invention relates to a seesaw-type fixed-pitch propeller of a multi-fixed-pitch propeller helicopter, which can overcome the problem that due to the horizontal setting of the fixed-pitch propeller tip rotation surface of the multi-fixed-pitch propeller helicopter, when the multi-fixed-pitch propeller helicopter flies forward horizontally, the front of the fixed-pitch propeller The advancing blade accelerates and the lift force increases, while the backward blade decelerates and the lift force decreases, causing roll interference and reducing the influence of the alternating bending moment generated by the blade root of the propeller on the blade, prolonging the service life of the blade. Background technique [0002] At present, the known method to overcome the horizontal setting of the fixed-pitch propeller tip rotation surface and the unfavorable influence of the lift asymmetry phenomenon on the forward flight of the helicopter due to the accelera...

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