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 different oil pumps to be tested to resolve general gear noise.
| Identifier | ExFiles\Box 149\2\ scan0131 | |
| Date | 24th December 1936 | |
| -2- (4) General gear noise - with hot oil. The pumps which should be tried are as follows. (1) Helical gear Bentley Pump LeC.4288 (a) with existing 22º angle teeth. (b) " - 10º " " (c) " - 50º " " (2) Standard 25/30 straight tooth pump. (3) Increased capacity straight tooth pump. (4) Phantom III. original small Helical gear pump. (5) Phantom III. std. Helical pump with and without suction restriction washer. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||