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 a cylinder head change on the 28-EX model, replacing the Vulture head with a standard one.
| Identifier | ExFiles\Box 11\5\ 05-page133 | |
| Date | 23th May 1934 | |
| X 7941 To RHC.{R. H. Coverley - Production Engineer} HS{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux}8/KW.23.5.34. 28-EX. Will you please change the cylinder head on 28-EX. The Vulture head with quiet tappets is required for other purposes and is to be handed over to Steadman. We have obtained a standard head from Swindall which has been used on the Test Bed. It has exhaust valves to Hs.{Lord Ernest Hives - Chair}1197, being 1.775 dia. as against 1.800 dia., compression ratio 5.25 to 1 HS{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux} | ||