Aeromarine Origins - Putnam by H. F. King PDF

By H. F. King

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In Switzerland during the early 1880s M. Raoul Pictet was conducting model tests on Lake Geneva - 'dynamometric experiments' as Ernest Archdeacon later termed them; and in 1883 he published a pamphlet Etude theorique et experimentale d'un Bateau rapide. e. the bottom curved down towards the stern), and when the British Admiralty caused it to be tank-tested it was found to be considerably superior to the earlier Ramus models - approaching, in fact, present-day efficiencies. It was Sir John Thornycroft's son, Mr J.

T:±r _I '-, .. - -'-- - -_. I' -t:Te'-:-'-i--~--' t· I I '" /' . --d~L-----L-----t---L=+ J I ;0 II 1;' ,1 I I I I I I I T I I I ' ! I r I I I I I /. S. Lightning, the Royal Navy's first torpedo boat. For this vessel an air-cushion hull was designed by Sir John Thornycroft and tanktested in model form. The original drawings (1877) of Sir John Thornycroft's air-cushion hulls. The craft of near-circular plan form is shown with a semi-immersed propeller. 80 The foregoing is a description of what is called today a plenum-chamber air-cushion vehicle.

It may be safely taken F 81 IT that when air goes under a vessel without forcing, it will fail to give any support. ' Later he added: '... in a vessel in which the support is due to air in a hollow, the centre of pressure must coincide with the centre of gravity of the area of the hollow. It is much more advantageous to have such a definite centre of support than the ever-shifting position ofthe centre of the lifting force due to contact with the water surface. The practical difficulties, however, to be overcome in producing a type embodying this principle are many.

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Aeromarine Origins - Putnam by H. F. King


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