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).
Diagonal web scraper piston in cast iron with a spring skirt.
| Identifier | ExFiles\Box 77\3\ scan0226 | |
| Date | 13th January 1920 | |
| To Dn. from E.{Mr Elliott - Chief Engineer} Copy to CJ. " " Bn.{W.O. Bentley / Mr Barrington} " " Hs.{Lord Ernest Hives - Chair} " " Ck.{Mr Clark} X 3881 E6/G13.1.20. 3881 X.3754 RE DIAGONAL WEB SCRAPER PISTON IN CAST IRON WITH SPRING SKIRT. We send you herewith drawing No.LeC.1186 shewing the above. The spring skirt is formed by cutting a horizonal slit .200" wide and a slit inclined at 71° with the vertical 1.125" wide. It is thought, to make the piston a more practical job, to use the stronger saws that the wider dimensions of slits allow, and at the same time the necessity for drilling in the corners is cancelled. A further advantage is that the saw for the horizonal slit is strong enough to cut the uneven section of piston wall immediately below the scraper ring, as aimed at (S487a) in N.3080, which allows the most efficient use of the length dimensions of the piston. E.{Mr Elliott - Chief Engineer} | ||