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 graph for car 27EX at Brooklands, showing top gear acceleration against time.
| Identifier | ExFiles\Box 182\M19\ img210 | |
| Date | 10th July 1931 | |
| 27EX. CAR: PERFORMANCE TESTS ON BROOKLANDS. 10th 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/SQ" 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) (Ex-STD) ROAD SPEED M.P.H. TIME (SECS) STAMP: ROLLS ROYCE LTD. PRINT ROOM WATERLOW 13 JUL 31 DRAFT | ||