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 illustrating the gain or loss in speed resulting from various vehicle modifications during tests at Brooklands.
| Identifier | WestWitteringFiles\Q\2-July1927-September1927\ 113 | |
| Date | 8th September 1927 | |
| BROOKLANDS SPEED TESTS 8. 9. 27 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: BALLOON TYRES: .5 M.P.H. LOSS UNDERSHIELD OFF: 1 M.P.H. LOSS PLAIN BONNET: 1.4 M.P.H. LOSS * 16 TOOTH AXLE: 2.5 M.P.H. LOSS HOOD UP: 2.5 M.P.H. LOSS TAIL REMOVED: 4 M.P.H. LOSS C.O. CLOSED: 7.4 M.P.H. LOSS WINGS REMOVED: 3.3 M.P.H. GAIN REVERTING TO 10 EX. OLD BODY NORMAL TOURING CAR: 11.4 M.P.H. LOSS * SEE REPORT RE CONDITIONS | ||