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).
Instructing the Drawing Office to revert to using pinned piston rings instead of the new unpinned double rings.
| Identifier | ExFiles\Box 181\M13\M13.1\ img004 | |
| Date | 28th March 1911 | |
| R MSS DEPARTMENTAL MEMO. Issued 28th March 1911 R.R. 348a (100 H) (P.744. 29.11.10). E.P. 7992. This column is for Name of Person addressed. C.J. DATE. 28/3/11 x441 R8/D28311 Referring to the previous note on the question of piston rings, we find that the pinned rings are giving generally a tighter engine than the new double rings unpinned. I have, therefore, instructed the Drawing Office to alter the sheets of all engines unbuilt, - the two lower rings to be of our old single standard type previous to the introduction of the double ring, and these to be pinned at right angles to the piston pin, one on each side. [Signature] Reply J 30/03/11 [Signature] This sheet must be filed with the correspondence to which it refers. | ||