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).
Strengthening modifications for the 20 HP piston, including a special taller version for 'India 3'.
| Identifier | ExFiles\Box 105\2\ scan0172 | |
| Date | 14th July 1928 | |
| BY.{R.W. Bailey - Chief Engineer} from E.{Mr Elliott - Chief Engineer} c. to BJ. Hs.{Lord Ernest Hives - Chair} X.5040 E3/M14.7.28. 20 HP. PISTON. We have not yet seen the broken pieces of the 20 HP. piston, but we send you herewith LeC.2575 shewing this piston strengthened up in the same way that we strengthened up the Phantom, by increasing the angle between the diagonal webs, thickening the web on the spring side of the piston, bossing up the hole for the g flap, and filling in the hollow space under the rings. This strengthening is intended for immediate use on our std. product. For India 3, you will require a piston .125" taller, for which we shall make a separate drawing. E.{Mr Elliott - Chief Engineer} | ||