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. | ||