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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 performance graphs comparing tractive resistance, acceleration, horsepower, and efficiency for two car models.

Identifier  ExFiles\Box 29\3\  Scan139
Date  26th February 1923
  
Top Headings:
6 EX ---- ALL READINGS CUT OUT OPEN
OPEN TOURING
15x52
MEDIUM COMPRESSION
WT WITH PASSENGERS 2.15 TONS
4 GII ----
OPEN TOURING
13x60
WT WITH PASSENGERS 1.625 TONS

Graph A:
TRACTIVE RESISTANCE LBS. PER TON.
M.P.H.
Labels: 4GII CAR & ENG, 6EX CAR & ENG, 4GII CAR, 6EX CAR
Title: TRACTIVE RESISTANCE
Note: (REDUCED)

Graph B:
ACCN FT PER SEC. PER SEC.
M.P.H.
Title: ACCELERATION

Graph C:
H.P.
M.P.H.
Title: H.P. TO ROTATE ENGINE (UNCORRECTED) THROTTLE OPEN.

Graph D:
H.P.
M.P.H.
Title: H.P. TO ROTATE ENGINE (THROTTLE OPEN)
CORRECTIONS MADE FOR ROTATING PARTS & GEAR LOSSES

Graph E:
H.P.
R.P.M.
Legend: I.H.P., B.H.P., DYNO H.P.

Graph F:
H.P.
M.P.H.
Plot Lines: DYNO HP, ROAD HP
Title: ROAD HP CURVES COMPARED WITH DYNO HP CURVES.

Graph G:
% EFFICIENCY
R.P.M.
Plot Lines: M.E. ENGINE, M.E. ENGINE & CAR
Title: MECHANICAL EFFICIENCY
ENGINE
ENGINE & CAR

Unlabeled Graph (Top Middle):
HORSE POWER
ROAD SPEED M.P.H
Note 1: 3 OBTAINED FROM (1A-1B) + 2A
Note 2: 4 GII & 6 EX CORRECTION FOR ROTATING PARTS FOR GRAPH C (SEE GRAPH D)

Unlabeled Graph I (Middle Left):
H.P.
M.P.H.
Title: ROTATING EFFECT 40/50 WHEELS
Plot Lines: HP GIVEN OUT DECELERATING CLUTCH IN, HP GIVEN OUT DECELERATING CLUTCH OUT, HP ABSORBED ACCELERATING

Unlabeled Graph J (Middle Right):
H.P.
M.P.H.
Title: ROTATING EFFECT 40/50 FLYWHEEL
Plot Lines: HP GIVEN OUT DECELERATING, HP ABSORBED ACCELERATING

Bottom Legend:
THICK LINES FOR 6 EX
DOTTED LINES FOR 4 GII
  
  


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