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).
Series of five performance graphs from Brooklands tests, detailing horsepower, braking, acceleration, and resistance for chassis 98 N.K.
| Identifier | ExFiles\Box 29\3\ Scan180 | |
| Date | 14th October 1925 | |
| TOP LEFT SECTION: GRAPH I Axis Labels: ROAD WHEEL H.P. vs{J. Vickers} 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. Test Details (Left Side): 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. TOP RIGHT SECTION: GRAPH II Axis Labels: ROAD SPEED M.P.H. vs{J. Vickers} DISTANCE TO REST FEET. Legend: BRAKING DISTANCE TO REST. SURFACE DRY TAR MACADAM. REAR WHEELS ON THE POINT OF LOCKING. MIDDLE SECTION: GRAPH III Axis Labels: ACCELERATION FT./SEC.² vs{J. Vickers} ROAD SPEED M.P.H. Legend (ACCELERATIONS): X. SECOND SPEED ACCELERATION Y. THIRD SPEED ACCELERATION Z. DIRECT DRIVE ACCN (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. Curve Labels: F.A.C. C.O. CLOSED, 40/50 C.O. OPEN Vehicle & Test Specifications (Right Side): 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. BOTTOM LEFT SECTION: GRAPH IV Axis Labels: TRACTIVE RESISTANCE LBS./TON. & ROAD WHEEL H.P. vs{J. Vickers} ROAD SPEED M.P.H. Legend: A.{Mr Adams} ROAD WHEEL H.P. CALCULATED FROM ACCN. & T.R. CURVES. B. TRACTIVE RESISTANCE CURVE. BOTTOM RIGHT SECTION: GRAPH V Axis Labels: RETARDATION FT./SEC.² vs{J. Vickers} ROAD SPEED M.P.H. Legend: RETARDATION OBTAINED AT VARIOUS ROAD SPEEDS. MAX VARIATION EXPERIENCED DURING TESTS INDICATED. SURFACE. DRY TAR MACADAM. STAMP (Bottom Right): ROLLS-ROYCE, LIMITED PAINT ROOM. 14 OCT 1925 DERBY | ||