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).
Issues with engine cooling, a Vauxhall 10 flywheel, and tank gearbox tooth stresses.
| Identifier | ExFiles\Box 127\4\ scan0258 | |
| Date | 17th December 1940 | |
| Rm{William Robotham - Chief Engineer}/GB.6/ST.17.12.40 - 2 - ENGINE COOLING. 35. Before the last increase in fan size, the H.P. dissipated was This is 10% of the engine output. Vauxhall are sorry that the fan has to pump the heated air. VAUXHALL 10 FLYWHEEL. This is cast iron. We were recommended not to reduce the thickness of the centre portion to improve engine smoothness. Maurice Platt (now the Power Unit Engineer) said that a more flexibly mounted flywheel took the thump out of the Vauxhall 10 engine. He also said that some car bodies amplified this noise more than others and, at the time the war started, there was a proposal to measure the stiffness of a large number of 10 H.P. car bodies to see if this were connected with engine noise. TANK GEARBOX TOOTH STRESSES. Mr. Stott said that Vauxhall used a modification of the Lewis formula. They assume that the worst condition is when single tooth loading is as high up the tooth as possible. The stress in the first speed gears is about 60,000 lb/sq.in. and, in the most used gears, it is about 20,000. Rm{William Robotham - Chief Engineer}/GB. | ||