Fixed-pitch propeller helicopter with unequal propeller pitch

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Fixed-pitch propeller helicopter with unequal propeller pitch

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JIANG FUYU

The invention discloses a fixed-pitch propeller helicopter with an unequal propeller pitch. The helicopter is composed of four fixed-pitch propellers, connecting lines of projections of rotating centers of three identical propellers on a horizontal plane form an equilateral triangle, and the three propellers are arranged on the left side, the right side and the rear side of a helicopter body respectively. The projection of the rotating center of the other propeller with the larger propeller pitch on the horizontal plane is on the center of the equilateral triangle, the projection of the gravity center of the fixed-pitch propeller helicopter with the unequal propeller pitch on the horizontal plane is on the center of the equilateral triangle, and the rotating direction of the central propeller is opposite to that of the left propeller, the right propeller and the tail propeller. Three identical engines are arranged to drive the left propeller, the right propeller and the tail propellerrespectively, another engine is arranged to drive the central propeller, the power of the engine for driving the central propeller is larger than that of the engines for driving the left propeller, the right propeller and the tail propeller, and due to the two kinds of propeller pitches, the propellers keep high efficiency within a large speed range. The helicopter is suitable for flying in a narrow space.

一种桨距不等中心定距螺旋桨直升机，由四个定距螺旋桨构成，其中三个完全相同的螺旋桨的旋转中心在水平面的投影的连线是等边三角形，这三个螺旋桨分别设置在机身的左边、右边和后边，另一个桨距更大的螺旋桨的旋转中心在水平面的投影在该等边三角形的中心上，桨距不等中心定距螺旋桨直升机的重心在水平面的投影在该等边三角形的中心上，中心螺旋桨与左边螺旋桨、右边螺旋桨和尾螺旋桨的转向相反，设置三个相同的发动机分别驱动左螺旋桨、右螺旋桨、尾螺旋桨，设置另一个发动机驱动中心螺旋桨，驱动中心螺旋桨的发动机的功率大于驱动左、右、尾螺旋桨的发动机的功率，因有两种桨距，螺旋桨在较大的速度范围保持高效率，适合在狭窄的空间飞行。