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).
Bar chart showing the results of speed tests at Brooklands, detailing MPH gains and losses from altering a standard vehicle configuration.
| Identifier | ExFiles\Box 70\1\ scan0096 | |
| Date | 8th September 1927 | |
| BROOKLANDS SPEED TESTS STANDARD CONDITION = COMP RATIO 4.95-1 TURBULENT HEAD. ALUM ENGINE SPORTS TAIL UNDERSHIELD. SPECIAL WINGS C.O. OPEN. R.R. CARB. DOUBLE VALVE SPRINGS TOTAL LOAD VALVE OPEN 110.7 LBS. VALVE CLOSED 77.0 LBS. ALTERATION FROM STANDARD CONDITION ABOVE GAIN OR LOSS IN M.P.H. FROM STANDARD CONDITION AS ABOVE GAIN LOSS Alterations vs{J. Vickers} Gain/Loss: BALLOON TYRES: NONE (LOSS) UNDERSHIELD OFF: .5 M.P.H. (LOSS) PLAIN BONNET: 1 M.P.H. (LOSS) 16 TOOTH AXLE: 1.4 M.P.H. * (LOSS) HOOD UP: 2.5 M.P.H. (LOSS) TAIL REMOVED: 2.5 M.P.H. (LOSS) C.O. CLOSED: 4 M.P.H. (LOSS) WINGS REMOVED: 3.3 M.P.H. (GAIN) REVERTING TO 10 E.X. OLD BODY: 7.4 M.P.H. (LOSS) NORMAL TOURING CAR: 11.4 M.P.H. (LOSS) * SEE REPORT RE CONDITIONS | ||