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Updated: May 28, 2025
"Here we go!" came the cry from the aviator. "Only a few seconds now!" They could plainly see the heaving waters of the big lake. Fortunately it was comparatively calm, though once she had landed the airship could stand some rough weather afloat. Splash! went the hydroplanes into the water.
I also used, in conjunction with the hydroplanes, horizontal rudders which I then called "levelling vanes," as their purpose was just the opposite from that of the horizontal rudder used in the diving type of vessel. They were operated by a pendulum controlling device to be inclined so as to always maintain the vessel on a level keel rather than to cause her to depart therefrom.
The modern submersible usually forces itself under water, while still in a slightly buoyant condition, by its propellers and by the action of two sets of rudders, or hydroplanes, which are arranged along its superstructure and which tend to force it below the surface when they are given a certain inclination; but should the engines stop, the diving rudders, or hydroplanes, would become ineffective, and, because of the reserve buoyancy in the hull, the vessel would come to the surface.
It had two propellers, and these were controlled by chain transmission. Old Grimshaw had not much use for hydroplanes, he had told Dave. His hobby was air machines. However, because his favorite pupil was going to run the machine, he allowed Dave to explain about the hydroplane, and was quite interested.
I will now set the hydroplanes at ten degrees down and the horizontal rudder two degrees up, and the boat will submerge to a depth of thirty feet and run constant at that depth." He had shut off the gasoline motor and started the storage-battery electric motor, which was used when running submerged. The great motors gave out a strange, humming sound. The crew conversed in low, constrained tones.
Another detachment which entered Russian positions brought back north of Miadziol one officer, 188 men, six machine guns and four mine throwers. Numerous bombs were again dropped on the railway freight station at Dvinsk. In the Baltic, however, three Russian hydroplanes in the Irben Strait engaged four German machines, bringing down one.
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