From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Machinery requirements and testing procedures for 1939 Motor Torpedo Boats (M.T.B's).
| Identifier | ExFiles\Box 133\3\ scan0080 | |
| Date | 10th August 1939 | |
| 428 Copy from Wd.{Mr Wood/Mr Whitehead} Wd.{Mr Wood/Mr Whitehead}14/RS.{Sir Henry Royce's Secretary}10.8.39. o.{Mr Oldham} to Rm.{William Robotham - Chief Engineer} MACHINERY REQUIREMENTS FOR 1939 M.T.B's. ----------------------------------------------- I have now received from the Admiralty the Statement of Machinery requirements for the 1939 M.T.B.'s and the following is an extract dealing with cruising engines and working trials and tests :- 17. Cruising Engines. Two cruising engines of approved type the output of each at continuous rating being as high as possible but not exceeding 150 BHP. are to drive the wing shafts through the auxiliary drives included in the main engine gearboxes. These engines are to be provided with clutch and reverse gears and separate exhaust, fuel, lubricating oil and cooling water systems, as stated above, to enable them to run independently of the main engines. The auxiliary drive couplings will be incorporated with the main engine gearboxes and will be provided by the Admiralty. Arrangements are to be made on these engines for driving the dynamos (mentioned in the electrical statement of requirements) and suitable bilge pumps by chains or gearing of suitable type. 22. Workshop Trials and Tests. The following trials are to be carried out on the cruising engines, each complete with clutch, reverse gear, dynamo, water and bilge pumps. These trials are not applicable to the main engines which will be fully tested at the makers works, before delivery. (a) No Load Trial. Half an hour at no load at revolutions not exceeding one half and fuel consumption not exceeding one quarter of those guaranteed for maximum power. (b) Continuous Rating Trial. Four hours at the guaranteed normal BHP. and at the speed at which the engine is designed to run in the boat for the two hours trial. (Clause 23, Para. IIa). (c) Maximum (Emergency) Rating Trial. Half an hour <del>at the maximum guaranteed power on the brake with</del> of the Froude or similar type. | ||