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).
List of technical design considerations and requirements for an engine, likely for marine application.
| Identifier | ExFiles\Box 133\3\ scan0098 | |
| Date | 15th January 1940 | |
| -3- (7) Flame arresters are fitted as one of the fire safeguards, one is impressed by the dread of fire even after the designer has taken steps to overcome known possibilities. (8) A gear type water pump is preferred to the centrifugal type because it is more able to deal with dirty water, it also has the advantage that the flow is proportional to the speed. (9) Hand starting must be supplied in addition to the electric motor, the hand starting handle is remote through a chain, free wheel etc. (10) The provision on the engine for driving a Bilge pump should be made with a clutch which can be engaged at will. (11) We don't know much about the size of the flywheel, on the slow speed engines the flywheels become so big that the designer puts them at the front end of the engine, the object being to keep down the size of the bell housing of the reduction and reverse gear box at the aft end. (12) Water cooled sump versus a separate cooler, this requires more thought. (13) The silencer would be bought out. (14) A Tachometer is absolutely essential. (15) It is quite impossible to oil drain the sump by the ordinary method, we should fit a hand suction pump for this purpose, perhaps Tecalemit. (16) A thermostatic bye-pass is not liked by all owners, some prefer to regulate the temperature by a hand cock on the inlet side, we should supply a thermometer. (17) In a twin-engined boat the dynamos do not have to supply the ship's lighting, a separate machine is used for thiss. (18) Battery ignition is O.K., two coils are wanted with a change-over switch. (19) The belt drive at the forward end will not suffer from slip if we keep down the bilge water. There is not much doubt, when we learn more on this subject, the above may be modified. | ||