| 摘要 |
In a vehicle or device a fluid motor is employed to drive rotary members, such as wheels, propellers, tracks. The motor is provided with an arrangement which includes a control means and an axially moveable member. By utilizing the control means, for example, by a flow of fluid, the axially moveable member is used to apply an action, which is not common to the usual operation of fluid motors. The arrangement may be used to arrest the rotor of the motor from rotation when no pressure is in the driving fluid line. It may also be used to control the pitch of propellers with variable pitch arrangements. Also possible is to use the arrangement to automatically obtain an auto-rotation of rotor blades on vertical axes of vertically take off and landing vehicles, when the pressure in the fluid line to the motors for driving the motors drops below a predetermined minimum of pressure. The speciality of the preferred embodiment which is shown in FIGS. 18, 19, 24 to 26 and 34 to 37 consists in the provision of a tail propeller, a main lift propeller and a rate of power varying means in the transmission between the power plant and the mentioned propellers. Thereby the tail propeller acts as forward driving propeller, while the main lift propeller may act with vertical or slightly inclined axis or it may be stopped to rest. The vehicle can thereby fly as a helicpoter or selectively as a gyrocopter and as an aircraft flying on wings if the wing assembly is assembled to the vehicle.
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