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).
Engine vibration, air cooling methods, and ignition system components.
| Identifier | ExFiles\Box 173\2\ img195 | |
| Date | 7th March 1934 | |
| -4- Their main trouble at these high speeds is due to vibration from the present belt drive mountings which are far from rigid. I shewed them our mounting and they said 6,000 R.P.M. should be possible on this, no special winding precautions. Brush wear passable. They are sold on air cooling. On the Cadillac for some time they have used an air scoop; on the new La{L. A. Archer} Salle they are using on air scoop and a sirocco type fan to draw in air. They admit they have not much desert experience with the fan type yet, but with the air scoop the brush wear has not worried them. If they can do this in America, where the dust conditions in some places are exceedingly bad, we ought at least to try it out. They say it puts up the output they can handle enormously. I suggested we might get a lot from insulating our dynamo from the crankcase but they were not enthusiastic. They run their machines to 120°C. They have gone to current regulation as a half way step to voltage control. (3) Ignition They too have been making coil studies with the Neon Lamp oscillograph. They consider they might possibly make a single 12-volt coil fire 6 times per rev., but would prefer two coils. They would not attempt it with 6-volt coils. They think we have a big advantage over them having 12-volt coils. They know nothing of the vibrator coil, it is Kennington's invention in England. I have their latest distributor for Cadillacs, also starter motor. They gave me these, also two 12-volt coils, as all their work has been done on 6-volt coils, they are not too proud of these two samples. Mr. Dawson, their Chief Engineer, is interested in the signalling direction devices on the Bentley. Could you arrange to send him a complete set, including any variations of switches available, right away? They have given me at least £15 worth of stuff, so I should like to reciprocate. His address is :- Delco Remy Engineering Dept., Anderson, INDIANA. | ||