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).
Table comparing car speeds in m.p.h. over a full lap and half mile under various configurations.
| Identifier | ExFiles\Box 71\1\ scan0313 | |
| Date | 7th September 1927 guessed | |
| contd :- -5- STANDARD CONDITION OF CAR - HOOD DOWN - LOUVRED BONNET - C.O. OPEN - HIGH PRESSURES TYRES - UNDERSHIELD AND TAIL IN POSITION. Alteration from standard condition. | Speed m.p.h. Full lap. | Half mile. Plain bonnet - hood up. | 83.99 | 86.54 " " - hood down. | 85.57 | 88.24 Standard. | 86.54 | 89.11 C.O. closed. | 83.33 | 87.7 Undershield off. | 86.09 | 88.67 Balloon tyres. | 85.72 | 88.24 Tail removed. | 85.6 | 88.24 Front wings removed. | 87.53 | 89.55 Hs{Lord Ernest Hives - Chair}/W.A.Robotham. | ||