| 摘要 |
An air vehicle such as an airship is provided, having a rounded top portion, and the bottom portion of which has a substantially planar shape, including a region having a smaller inclination, which is referred to as a bottom surface, and the surface area of which is larger than that of an intermediate region having a greater inclination, referred to as an intermediate surface. The general shape produces, due to relative wind, a resulting overall downward force near the ground. The vehicle also includes a device for anchoring same to the ground, the anchoring device being stationary or controllable from the vehicle, located at the front portion of the vehicle, and projecting downward, in particular a ram including a portion which can be expanded by applying a bar against a translatably movable shoulder. Also included is a landing method implementing such a vehicle. |
| 主权项 |
1. An aircraft, of the powered airship type with at least partial buoyancy, comprising: an external envelope has, stably at least in the landing phase, a general shape designed to produce, under the effect of the relative wind, an overall resultant downward force directed towards the ground, when said airship is in a horizontal attitude and is distant from the ground by less than a specified distance, with an overall nose-down torque; said shape being defined by:
a rounded upper portion, and a bottom face of flat or very slightly curved shape,
said aircraft moreover comprising: one or more elevators located forward of the centre of thrust of the aerodynamic drag of the aircraft and arranged to produce, under the effect of the relative wind, a nose-up angle sufficient to produce an upward lifting force and increase the angle of attack, thus reducing or cancelling said downward force and said nose-down moment, thus allowing the aircraft to approach the ground in a controlled manner until a rear portion of the airship comes into contact with the ground followed by a decrease in nose lift until the front portion of the airship comes into contact with the ground in a position called the ground position; and a device for anchoring to the ground that is rigid, and fixed or maneuverable from said aircraft, which is located in the front portion of said aircraft, with a geometry configured for extending towards the bottom of the rest of the aircraft, in particular relative to the lowest element of the aircraft when the latter is in contact with the ground in an attitude where the overall resultant force is zero or is directed downwards.
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