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Updated: June 23, 2025
Screws opposing a slanting plane to the bed of air will produce an ascensional movement, and the models experimented on have shown that the disposable weight, that is to say the weight it is possible to deal with as distinct from that of the apparatus, increases with the square of the speed.
The supporting truss beneath the wings, which was such an outstanding feature of its prototype, has been dispensed with, the usual I-beam longitudinals being used in its stead. The latest machines fitted with 100-120 horse-power Mercedes motors have a fine turn of speed, possess an enhanced ascensional effort, and are far simpler to control.
He hired the sumptuous hotel he inhabited at the top of the Champs Elysees, when houses were rather scattered there. Fashion, and the ascensional movement of Paris toward the Arc de Triomphe, had come to seek him. His house was rich in beautiful pictures and rare books, and he sometimes received there his few real friends, his companions in troublous times, like Varhely.
In 1845 came Cossus and his ascensional screws. In 1847 came Camille Vert and his helicopter made of birds' wings. In 1852 came Letur with his system of guidable parachutes, whose trial cost him his life; and in the same year came Michel Loup with his plan of gliding through the air on four revolving wings.
The ascensional movement suddenly ceased. The raft became still and motionless. "What is the matter now?" I said, querulously, very much startled by this change. "A simple halt," replied my uncle. "Is the eruption about to fail?" I asked. "I hope not." Without making any reply, I rose. I tried to look around me.
In other words, the ship being raised into the air to the stratum immediately above the region of storms and maintained there by the ascensional force of the balloons, and being forced onward by the screws, the four anterior wings are to be opened, the four posterior ones remaining closed.
All that was necessary was to get above this bed of mist, which was nearly thirteen hundred feet thick, and the ascensional screws being increased in speed, the "Albatross" was soon clear of the fog and in the sunny regions of the sky.
Her dimensions allowed of her rising to the greatest height a balloon could attain; her impermeability enabled her to remain for an indefinite time in the atmosphere; her solidity would defy any dilation of gas or violence of wind or rain; her capacity gave her sufficient ascensional force to lift with all their accessories an electric engine that would communicate to her propellers a power superior to anything yet obtained.
The process calls for a certain manifestation of skill in manoeuvring the aeroplane in relation to the airship, judgment of distance, and ability to operate the aeroplane speedily. The rapid ascensional capability of the airship, as compared with that of the aeroplane, is a disadvantage, but on the other hand, the superior mobility and speed of the aeroplane would tell decisively for success.
For the moment there was nothing to fear. As the "Albatross" drifted off from Pitt Island she rose obliquely to nearly three thousand feet. It was necessary to increase the ascensional power to prevent her falling into the sea. When the look-out man had got clear of his gag and shouted, Robur and Tom Turner had rushed up to him and torn off his bandage.
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