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).
Blueprint comparing two designs, one labelled 'Effective Wing' and the other 'Ineffective Wing'.
| Identifier | ExFiles\Box 67\1\ scan0292 | |
| Date | 1st October 1928 guessed | |
| EFFECTIVE WING B A C 10.E.X. LIP FINISHES HERE INEFFECTIVE WING B A C 15.E.X. SECTIONS OF LIP AT A, B, & C SHEWN ON SEPARATE SKETCHES | ||