Material selection (Magnesium vs Aluminium) for the Wraith clutch casing.
| Identifier | ExFiles\Box 8\1\ 01-page05 | |
| Date | 15th January 1936 | |
| SECRET 612 To BY. {R.W. Bailey - Chief Engineer} from HDY. {William Hardy} HDY. {William Hardy} 1/HP.15.1.36. C. for. F. {Mr Friese} Hs. {Lord Ernest Hives - Chair} Ds. RWS. Wraith Clutch. N. Sch. 4332 herewith shows the casing for this clutch. The operating shaft is also shown. Magnesium is to be tried for this, but the first one or two should be made in aluminium in order to avoid complication to begin with. The dowels between the lower half and the crankcase prevent movement due to the weight of the engine when the upper half only is removed, as it may be for attention to the clutch. HDY. {William Hardy} | ||
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).