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).
Modification notice for the 'Griffon' II & IV engine supercharger drive ratio.
| Identifier | ExFiles\Box 10\4\ 04-page44 | |
| Date | 19th September 1940 | |
| C.P. No. 8. H.C.P./A.277. 2M. 'GRIFFON' II. A new modification has been introduced for 'Griffon' II & IV engine No. 111 which incorporates a reduction in the supercharger drive ratio of 8.95:1 to 7.85:1 together with a corresponding change in the two speed control system. INITIALS | ||