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 the 27Ex car at Brooklands, showing top gear acceleration.
Identifier | ExFiles\Box 29\3\ Scan338 | |
Date | 10th July 1931 | |
27Ex. CAR: PERFORMANCE TESTS ON BROOKLANDS. 10TH JULY 1931. RR. 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) Graph Y-axis: ROAD SPEED M.P.H. Graph X-axis: TIME (SECS) Graph line annotation: (24EX-STD) Stamp: ROLLS-ROYCE LTD [illegible] 13 JUL 31 DERBY | ||