ⓘ Coastal Motor Boat

                                     

ⓘ Coastal Motor Boat

During the First World War, following a suggestion from three junior officers of the Harwich destroyer force that small motor boats carrying a torpedo might be capable of travelling over the protective minefields and attacking ships of the Imperial German Navy at anchor in their bases, the Admiralty gave tentative approval to the idea and, in the summer of 1915, produced a Staff Requirement requesting designs for a Coastal Motor Boat for service in the North Sea.

These boats had to have a high velocity, making use of light and powerful petrol engines available. The speed of the vessel when fully loaded shall not be less than 30 knots of speed 56 km / h and sufficient fuel should be carried out to give a considerable radius of action.

They were armed in various ways, torpedoes, depth charges or mines. Secondary armament was provided by light machine guns, such as "Lewis". The weight of fully loaded boat, complete with 18 inch 450 mm torpedoes, not to exceed the weight of 30 feet, a 9.1 m powerboat carried in davits of a light cruiser, i.e. 4.5 tons.

The POC was developed thornycroft, which had experience in small fast boats. The engines were not proper Maritime internal combustion engines, since they were in short supply, but adapted aircraft engines from firms such as sunbeam and Napier.

                                     
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