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).
Required Cotal gearbox size for a 5.5 litre engine and plans for destructive testing a 3 litre version.
| Identifier | ExFiles\Box 146\5\ scan0287 | |
| Date | 4th March 1940 | |
| 1245 + 1153 W/P Sr. COTAL BOX. What we are interested in is the recommended size of gearbox to deal with a 5½ litre engine, because anything we produce must cover the range from 5½ litres downward. The magnets seem to us to be the limiting feature and possibly they have established some empirical formula for determining the magnet winding and dimensions. We actually have a 3 litre box in the Works which we are going to test to destruction. The power absorption figures are quite unbelievable but we should be able to check up on these ourselves. Rm.{William Robotham - Chief Engineer} | ||