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).
Design and testing of a cast iron piston for the Goshawk 11 engine, including decisions made by Mr. Royce.
| Identifier | ExFiles\Box 77\3\ scan0260 | |
| Date | 16th September 1921 | |
| To Da.{Bernard Day - Chassis Design} from E.{Mr Elliott - Chief Engineer} c. to CJ. c. to Wor.{Arthur Wormald - General Works Manager} c. to Hs.{Lord Ernest Hives - Chair} c. to BY.{R.W. Bailey - Chief Engineer} X4224 E7/G16.9. 21. X.4224 - RE CAST IRON PISTON FOR "GOSHAWK 11" - LeC.1447. We send you herewith the above drawing which will enable you to test cast iron pistons for Goshawk 11. Mr. Royce decided that this piston should have no scraper ring as he wished the cast iron surface to be amply lubricated owing to its greater possibilities of sezing as compared with aluminium. He also decided that this piston should be un-split, and that only aluminium pistons for Goshawk 11. should be split in the manner of our 40/50 H.P. We do not know what compression ratio you are using, as the compression pressure only was given in the experimental report, so we should be glad if you would adjust the height of this piston accordingly. The weight of the spring ring for securing for the gudgeon pin and the extra metal for the spring ring groove should be counter-balanced by thickening up the opposite wall of the piston when detailing. E.{Mr Elliott - Chief Engineer} | ||