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).
Letter to Wellworthy Piston Rings Ltd. concerning a bump crown piston design.
| Identifier | ExFiles\Box 148\1\ scan0093 | |
| Date | 3rd April 1939 | |
| 1256 Rm{William Robotham - Chief Engineer}3/R.{Sir Henry Royce} 3rd April, 1939. F.{Mr Friese} Blackith, Esq., Wellworthy Piston Rings Ltd., LYMINGTON, Hants. Dear Blackith, We suggest that you try the bump crown piston as shown on the sketch we sent you, in spite of the fact that this will give rather a lower compression ratio than we imagined. Having tried the piston, you can decide whether you will have to reduce the size of the bump slightly. Yours sincerely, | ||