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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
  
  


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