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).
Cost analysis and implementation instructions for introducing an overdrive gearbox on the 'D' series chassis.
| Identifier | ExFiles\Box 171\2\ img366 | |
| Date | 10th December 1938 | |
| PHANTOM III STANDARDISATION of PARTS. OVERDRIVE GEARBOX. CONCESSION No. 18.(1..38) To increase bearing life and provide smoother running at high speeds. Estimated cost of new tools ........£450.0.0. This modification has been instructed to be brought on production at the 101st chassis in "D" series. Overdrive gearbox to be introduced at 101st. chassis in 'D' series raises factory cost of chassis by £3.4.1d. Tool cost is £450.0.0d. and gross cost of material for 2nd. 100 chassis in 'D' series rendered scrap is £400.0.0d. but due to Repair Department absorbing £126.0.0d. worth of this, the Nett cost is £274.0.0d. This scrap consists mainly of partly machined gears, selector mechanism etc. RHC.{R. H. Coverley - Production Engineer} Left side boxes: Date: 1.10.38 Ref: .852. X Drg. No.: D.3000. Approval Table: INITIAL | DATE SC | 25.01.39 HS{Lord Ernest Hives - Chair} | 25.01.39 C | 13.12.38 YB | 15.01.39 AQ | 13.01.39 RHC{R. H. Coverley - Production Engineer} | 13.01.39 XM | 13.01.39 MR | 10.12.38 | ||