By H.F. King
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Extra info for Aeromarine Origins
One was 'practically a two-wedged ship, the after wedge being made in such a way as to retain the air'. S. Lightning, delivered in the year of the patent specification. Sir John described how he 'tried models intended to carry air under them in a hollow', continuing: 'This construction is favourable to high speed, for the angle of the surface rubbing on the water can be considerably reduced by the adoption of this plan, so reducing the resistance due to gravity on the incline. At the same time the friction due to air on the supporting water is much less than that due to water on a solid; and if the air could be cqrried with the model, the power required to force it under would be small, and would only amount to that necessary to make up waste.
Schroeder. An actual boat designed on the same principle is described in the text. valve was fitted in the upper part of the cowl shaft, compelling the air, when compressed by the movement of the vessel, to pass out through pipes to the under surface of the hull. The sides of the vessel would preferably project below the bottom in the form of side keels to retain the air. In another context the inventor - none other than 'Sam' Saunders himselfclaimed that when the boat was at full speed the air rushing into the bellows chamber would form a cushion that would absorb shocks, and that the compressed air escaping would form a cushion on which the boat would ride.
Mr. Ramus has today communicated to me the plan of designing steamships of great speed.... 'It consists in forming a ship of two wedge-shaped bodies, one abaft the other. 'The object of this invention is to cause the ship to be lifted out of the water by the resistance of the fluid at high speeds. ' The outcome was a series of model trials by William Froude, one of the greatest naval architects of all. These were conducted, however, on the assumption that the full-scale vessel would be one of several thousand tons, and it was found that the speed required for such a craft to skim was so great that the idea was considered impracticable.