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 comparison between aluminium and iron brake drums for the Wraith model.
| Identifier | ExFiles\Box 120\1\ scan0246 | |
| Date | 16th November 1937 | |
| 1028 also 1260 Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale}1/JH.16.11.37. WRAITH BRAKE DRUMS - COSTS. The cost figures recently circulated by RHC{R. H. Coverley - Production Engineer}/SB.{Mr Bull/Mr Bannister} are based on an aluminium material cost of 1/3 per lb. We understand there is a surplus of 10 cwt. of alum. at £40. per ton per week, and will be for a long time to come. The saving on one Wraith if this material were used would be about £2.0.0. Applying this to the cost sheets we get :- £. s. d.{John DeLooze - Company Secretary} Wraith with aluminium drums, 9 0 0 including cost of rear shoes. Wraith with iron drums, 8 5 0 including cost of rear shoes. ____________ Difference £0 15 0 The same difference can be expected in the case of a Bentley. Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale} | ||