Aeronautics and astronautics – Aircraft – lighter-than-air – Airships
Patent
1975-10-20
1977-06-28
Halvosa, George E. A.
Aeronautics and astronautics
Aircraft, lighter-than-air
Airships
244 31, 244 97, 244125, B64B 158, B64B 140
Patent
active
040320863
ABSTRACT:
Aerostats and aquastats are described in which a sealed envelope of flexible material impervious to the passage of gas therethrough is mounted on a flexible frame forming a permanent part of the device and which can be caused to expand the envelope after it has been wholly or very substantially evacuated of internal gas, thereby setting up a vacuum or partial vacuum condition in the envelope. In the case of a partial vacuum, the gas at reduced pressure may be hydrogen or helium. The lift or buoyancy of the device may be controlled when in use by altering the volume of the envelope by adjusting the shape of the frame by acting mechanism carried by the device. The frame may comprise flexible rods connected together at opposite ends so that by forcing the opposite ends of the rods towards one another they are bowed outwards distending the envelope towards a globular form. The ends of the rods may be pulled towards one another by shortening a lazy-tongs linkage inside the envelope by a cam in actuating mechanism outside the envelope, the fluid pressure on the outside of the envelope being permitted to lengthen the linkage when required to reduce the volume. Alternatively, the forces on the rods may be applied entirely on the outside of the envelope or by an electromagnet inside the envelope either to bow the rods as aforesaid or to straighten them if they are curved rods.
REFERENCES:
patent: 205319 (1878-06-01), Tracy
patent: 998538 (1911-07-01), Lehmann
Halvosa George E. A.
Kelmachter Barry L.
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