The Screw Propeller; An Investigation of Its Geometrical And Physical Properties, And Its Application to the Propulsion of Vessels

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There is another cause which would render very small angles impractica- ble ; it is the great velocity which would be necessary to drive the screw round, thereby developing a large amount of friction in the engine.
From neglecting to take friction into account, this deduction does not agree very well with experiment, as will be seen from the valuable experi- ments made by John Fincham, Esq., of Her Majesty's Dock-yard, Ports- mouth.
When the angle of the screw is constant we have, by last probl
...em, the square of the velocity, varying inversely as the length and the fourth power of the radius.
.". «; is a maximum when -r — - is a max.
h r* If r be constant, « is a max., when - is a max.
' ' h Hence, when the radius and pitch are constant, the velocity will increase as the length diminishes.
This property is illustrated by the experiments on Her Majesty's ship Rattler.—See the " Artizan," 1845, page 55.
Ft. in.
ft.
Pitch 11 feet % 3 length 9 diameter velocity 10-088 ., 11 „ 3 „ 9 „ 11-409 „ 11 „ 30 „ 10 „ 10-78 „ 11 „ 2 „ 10 „ „ 10-91 There is a limit to the diminution of the length, in consequence of the increased rotatory motion of the screw developing a large amount of friction in the engine, which is not taken into account in these computations.


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