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).
Requesting the modification of 20 HP piston drawings to use Perfect Circle type piston rings.
| Identifier | ExFiles\Box 105\2\ scan0207 | |
| Date | 21th January 1930 | |
| X5040. BY.{R.W. Bailey - Chief Engineer} From Hs{Lord Ernest Hives - Chair}/ACL. Hs{Lord Ernest Hives - Chair}/ACL.1/MJ.21.1.30. Re. 20 HP. PISTONS. 5.25/1 COMPN. RATIO. We should like all the 20 HP. pistons which are arranged to give 5.25/1 compression ratio to have the Perfect Circle type of piston ring like shewn on E.55714 and E.55562. Will you please arrange to modifiy the drawings of the 5.25/1 pistons to take this ring. Hs{Lord Ernest Hives - Chair}/ACL. | ||