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).
Comparison of two design schemes for the Wraith Chassis Fan, detailing material differences and cost savings.
| Identifier | ExFiles\Box 148\5\ scan0148 | |
| Date | 11th March 1937 | |
| 1260. To Rm{William Robotham - Chief Engineer}/Std. from G/Rb.{R. Bowen} G/Rb.{R. Bowen}7/K/73/C15337. Within Rm{William Robotham - Chief Engineer}/STD Wraith Chassis Fan - Section 5220. Rm{William Robotham - Chief Engineer}/Std.2/R.11.3.37. We have superficially compared the designs for the Wraith Fan as follows:- LeC.5552 which has a cast iron bracket with an eccentric spindle. R.R. Scheme 1045 which has cast Aluminium bracket with concentric spindle. Our opinion is that LeC.5552 is definitely the cheaper scheme, and consider that it would show a factory cost saving of approximately 4/= per chassis over the R.R. scheme 1045. G/Rb.{R. Bowen} Busk | ||