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).
Performance test results for car 27EX at Brooklands, showing an acceleration graph.
| Identifier | Morton\M19\ img210 | |
| Date | 13th July 1931 | |
| 27EX. CAR: PERFORMANCE TESTS ON BROOKLANDS. 10.. JULY 1931. R.R. TWIN CHOKE CARBURETTER. R ENGINE CAMSHAFT (110°) COMPRESSION RATIO 4 . 8:1 REAR AXLE RATIO STANDARD. (3.727:1) CAR WEIGHT COMPLETE 46 CWT 2 QRS. 21" RACING TYRES (EFFECTIVE CIRCUMF. AT 50 LBS/☐" PRESSURE 105.75" = 599 REVS/MILE ENGINE REVS/MIN AT 60 M.P.H. TOP GEAR = 2233. BEST LAP SPEED 88.78 M.P.H. (CUT OUT OPEN) HALF MILE 90 M.P.H. (AGAINST STRONG HEAD WIND) (CUT OUT OPEN) ACCELERATION (TOP GEAR) CUT OUT OPEN (AVERAGE OF SIX TESTS) ROAD SPEED M.P.H. TIME (SECS) (24 EX-STD) STAMP: ROLLS-ROYCE LIMITED PRINT ROOM 13 JUL 31 DERBY | ||