Series of five graphs detailing vehicle performance tests conducted at Brooklands on a 5 Seater Barker Open Touring Body, chassis 98 N.K.
| Identifier | ExFiles\Box 69\3\ scan0332 | |
| Date | 12th October 1925 | |
| BROOKLANDS TESTS 4TH JULY 1925 ALL TESTS CARRIED OUT WITH CUT-OUT CLOSED HOOD & SIDE CURTAINS UP WEATHER CONDITIONS GOOD. TRACK DRY LIGHT WINDS PROJECTED FRONTAL CAR AREA REAR CAR AREA GRAPH I - Y-axis: ROAD WHEEL H.P. - X-axis: ROAD SPEED M.P.H - Legend: A. {Mr Adams} ROAD WHEEL H.P. C.O. OPEN. B. ROAD WHEEL H.P. C.O. CLOSED. C. ROAD WHEEL H.P. REQUIRED TO DRIVE CAR AT VARIOUS ROAD SPEEDS. GRAPH II - Y-axis: ROAD SPEED M.P.H. - X-axis: DISTANCE TO REST. FEET - Legend: BRAKING DISTANCE TO REST. SURFACE DRY TAR MACADAM. REAR WHEELS ON THE POINT OF LOCKING. GRAPH III - Y-axis: ACCELERATION FT/SEC² - X-axis: ROAD SPEED M.P.H. - Legend: ACCELERATIONS X. SECOND SPEED ACCELERATION Y. THIRD SPEED ACCELERATION Z. DIRECT DRIVE ACC'N (2.516 TONS) Z'. OPTIMUM PERFORMANCE EXPECTED FROM A PHANTOM WT SAME AS OLD 40/50 (2.15 TONS) R. {Sir Henry Royce} PREVIOUS TEST ON 40/50 WITH CUT-OUT OPEN. - Text on curves: E.A.C. C.O. CLOSED, 40/50 C.O. OPEN CHASSIS 98 N.K. 5 SEATER BARKER OPEN TOURING BODY. WT. COMPLETE FOR TEST (2 PASS.) 2.516 TONS. COMPRESSION RATIO 4-1. AXLE RATIO 15 x 52. BRAKING DISTRIBUTION 40% FRONT. ALL READINGS TAKEN WITH 3 PEN CHRONOGRAPH. MAX LAP SPEED IN THESE CONDITIONS BY STOP-WATCH 72.5 M.P.H. GRAPH IV - Y-axis: TRACTIVE RESISTANCE LBS/TON. - X-axis: ROAD SPEED M.P.H. - Legend: A. {Mr Adams} ROAD WHEEL H.P CALCULATED FROM ACC'N & T.R. CURVES B. TRACTIVE RESISTANCE CURVE GRAPH V - Y-axis: RETARDATION FT/SEC², ROAD WHEEL H.P. - X-axis: ROAD SPEED M.P.H. - Legend: RETARDATION OBTAINED AT VARIOUS ROAD SPEEDS. MAX. VARIATION EXPERIENCED DURING TESTS INDICATED. SURFACE. DRY "TAR MACADAM. STAMP: ROLLS-ROYCE LIMITED PRINT ROOM. 19 OCT 1925 DERBY. HANDWRITING: Rm {William Robotham - Chief Engineer} 12/10/25 | ||
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).