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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 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
  
  


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