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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).
Bar chart comparing the atmospheric temperature at which a car will boil under various cooling and ventilation configurations.

Identifier  ExFiles\Box 24\4\  Scan322
Date  25th November 1924
  
ATMOSPHERIC TEMPERATURE AT WHICH THE CAR WILL INEVITABLY BOIL IF DRIVEN FOR SUFFICIENTLY LONG ON FULL THROTTLE AT THE SPEED AND UNDER THE CONDITIONS MENTIONED.
JOB No. 281.

COLUMN HEADINGS & DESCRIPTIONS (LEFT TO RIGHT):

COLUMN 1:
Comparison of Various Car Conditions
Alteration in Matrix Height
Comparison of Advantages to be Gained by Increasing Height of Matrix
40/50 Car.
30 M.P.H.
No Ventilation
E.A.C. v Standard Tubes
Reduction in Efficiency due to Reducing Tube Length by 8 1/2%
30 M.P.H.
No Ventilation
Value of Degrees of Ventilation
30 M.P.H.
20 1/4" Matrix

COLUMN 2:
Comparison of Value of Louvres and Shutters and Maximum Ventilation Possible by Removing Bonnet Sides or Top
30 M.P.H.
20 1/4" Matrix
Best Shutter Positions.
Comparisons of Shutter Positions in Front or Rear of Side Panel.
40 M.P.H.
20 1/4" Matrix
Large Shutters
8" x 14.5"
Increase of Road Speed.
Efficiency of Cooling System at Various Road Speeds
20 1/4" Matrix.
4.8" Tubes
No Ventilation

COLUMN 3:
No Ventilation
Fan Value.
Relative Dependance of Hispano & 40/50 on their Fans
Loured Bonnets
20 1/4" Matrix.
40/50
Road Speed 30 M.P.H.
Limiting Improvement to 40/50
Comparison of Best 40/50 Conditions we can Give Customers and Hispano
40/50 28 3/4" Matrix Large Shutters Open
Hispano Standard Louvred Bonnet
30 M.P.H.
Hispano V 40/50 (Present Standard)
Both Cars Louvred Bonnets.
R.R. 21 1/4" Matrix.
Comparison of Standard Present 40/50 Matrix and Hispano Similar Conditions

CHART LABELS (BARS):
Matrix Height 20 1/4"
Matrix Height 21 1/4"
Matrix Height 22 3/4"
Matrix Height 23 1/4"
+4" Tubes
+8" Tubes
Standard Shutters 4 x 10.5"
Louvres
Side Panels Off
Top Panels Off
Side Panels Off
Front Shutters Open
Rear Shutters Open
All Shutters Open
No Ventilation
20 M.P.H.
30 M.P.H.
40 M.P.H.
No Ventilation
40/50 Without Fan
40/50 With Fan
Hispano Without Fan
Hispano With Fan
Large Shutters
Standard Hispano
40/50 - 28 3/4" Matrix
40/50 With Fan
Hispano 20 M.P.H.
Hispano 30 M.P.H.
40/50 20 M.P.H.
40/50 30 M.P.H.
40/50 With Fan
Standard Hispano
40/50 Louvred

BOTTOM AXIS:
ATMOSPHERIC TEMPERATURE C°

STAMP:
ROLLS-ROYCE LIMITED
PRINT ROOM
2 - 1 - 25
  
  


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