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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).
Comparative table of radiator performance and specifications under various test conditions.

Identifier  ExFiles\Box 24\5\  Scan354
Date  14th October 1930 guessed
  
FIGURES GIVEN ARE CRITICAL ATMOSPHERIC TEMPERATURE AT WHICH THE CAR WILL EVENTUALLY BOIL IF DRIVEN SUFFICIENTLY LONG.

DETAILS OF RADIATOR.

TYPE OF RADIATOR TUBES.
60 M.P.H. NO BONNET VENTILATION
ALL OUT NO BONNET VENTILATION.
ALL OUT VERTICAL LOUVRED BONNET.
RADIATOR LBS. WT. EMPTY.
RADIATOR LBS. WT. FULL.
NO. OF TUBES
SQ. FT. SURFACE OF RADIATOR
% DIRECT COOLING.

Temps. Centigrade Degrees.

Latest E.81395 6 m/m.{Mr Moon / Mr Moore} sq. parallel tubes.
42
33
39.75
140
176+
8880
218.5
46.2

Standard 6/7 turbulent air flow tubes.
39.5
30.5
39
129
168
8115
164
84.4

6/7 expanded end sq. tube E.80239.
37.75
28.0
36.75
132
173+
7680
178
84.5

5½/7 round tubes E.79321.
36.75
24.75
34.75
137.75
181
8991
163.5
84.3

Galloway zig zag ribbon no indirect.
34.5
25.0
Not taken.
114
154
Not calculated.
84

Standard 6/7½ tubes E.75445
34.25
21.75
32.25
120
168
8115
164
84.4

TESTS CONDUCTED ON 19-AX CAR ON BROOKLANDS TRACK. ALL RADIATOR MATRIX DIMENSIONS 25.9" x 23.7". CAR WEIGHT 48 CWT. AXLE RATIO 11 x 41.

+ Solid vertical strips. Rolled vertical strips reduce radiator weight by 15-16 lbs.
  
  


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