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 Messrs. Hepworth & Grandage Ltd. requesting the supply of piston rings with detailed specifications.
| Identifier | ExFiles\Box 148\3\ scan0124 | |
| Date | 27th May 1936 | |
| X1256 Exptl. Dept. Hs{Lord Ernest Hives - Chair}/Mths.{Reg Matthews}22/KW. 27th May, 1936. Messrs. Hepworth & Grandage Ltd., St.{Capt. P. R. Strong} John's Works, Bradford, Yorks. Dear Sirs, We should like you to supply us with the following Piston Rings :- 14 Scraper Rings (slotted). 14 Plain Compression Rings. 14 Stepped Compression Rings. The rings are intended for a 3.500" bore and we wish them to conform to the following main dimensions and wall pressures :- Scraper Ring. Overall width = .1875 - ½ Radial Thickness .150 + 3 - 3 Cylinder wall pressure = 47.0 lbs/sq.in. Plain Compression Ring. Overall width = .125 - ½ Radial thickness =.150 + 3 - 3 Cylinder wall pressure = 29 lbs/sq.in. | ||