Display model of petrol motor boat "Brook II"

whole display model (scale 1.12) of petrol motor boat Brook II (1908) mounted on mirror base

Scale 1:12 model of motor boat 'Brooke II'

The earliest successful internal combustion motor-launch appears to have been built in 1888, and was fitted with a Priestman oil engine. The first serious attempt to produce a high-speed motor-boat was made in 1902, when a speed of 19 knots was obtained with an engine of 66 h.p. by a boat designed by Mr. Linton Hope for Mr. S. F. Edge. The development of this class of vessel has been continuous and rapid, and has been due in a great measure to the application of the internal combustion engine.

The model represents a vessel built in 1908 by Messrs. J. W. Brookes and Co., and in general features shows a typical high-speed motor boat.

The flattening and widening of the afterbody sections, and the consequent cutting away of all the dead wood aft. is common to all high-speed motor craft, and is designed to prevent excessive change of trim of the vessel. The high bow and curved deck are also usual to most vessels of this type. Wood is used in the construction, on account of its lightness and low cost.

'Brooke II' is built of planking 0.25 in. thick, and has engine bearers 2 in. thick running from the stern of the boat to the transom. Weight has been kept at a minimum, the vessel weighing, with the machinery, only about 1,100 lbs.

It is propelled by a Brooke petrol motor having six cylinders, each 6.5 in. in diam. by 6 in. in stroke. The crankshaft is of nickel steel, and is drilled for lubrication purposes, the oil draining into a sump at the bottom of the crank-chamber. A gear-pump draws oil from the sum and forces it through an oil-cooler, from which it is redistributed to the main bearings. Both the valve covers and the cylinders and water-jacketed to avoid pre-ignition. On trial, fitted with a 20 in. three-bladed propeller, the vessel attained a speed of 24.6 knots with 960 revs. per min.

The principal particulars are: Length, overall 25 ft.; breadth 5 ft.; displacement, 1 ton; brake h.p., 100.

Details

Category:
Marine Engines
Object Number:
1908-58
Measurements:
overall: 170 mm x 650 mm x 130 mm, ,
type:
model
credit:
J.W. Brooks and Co. Ltd.