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 analysis of different radiator types, detailing performance under various conditions and physical specifications.
| Identifier | ExFiles\Box 15\1\ Scan406 | |
| 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. --- | --- | --- | --- | --- | --- | --- | --- | --- (Across first 3 data columns) Temp. Centigrade Degrees. Latest E.81385 6 mm. sq. parallel tubes. | 48 | 33 | 39.75 | 140 | 176+ | 8860 | 218.5 | 46.2 Standard 6/7 1/2 turbulent air flow tubes. | 39.5 (faint 41) | 30.5 (faint 33) | 39 (faint 40.5) | 120 | 168 | 8115 | 164 | 84.4 6/7 expand end sq. tube E.80239. | 31.75 (faint 35) | 28.0 (faint 32) | 36.75 (faint 40) | 132 | 173+ | 7050 | 178 | 84.5 5 1/2 / 7 round tubes E.79321. | 30.75 | 24.75 | 34.75 | 137.75 | 181 | 8991 | 163.5 | 84.3 Galloway zig zag ribbon no indirect. | 34. | 25.0 | Not taken. | 114 | 154 | (blank) | Not calculated. | 84 Standard 6/7 1/2 tubes E.79448 | 34. | 21.75 | 32.25 | 120 | 168 | 8115 | 164 | 84.4 FOOTNOTES: 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. HANDWRITTEN NOTE: Pump Delivery Allout 45 Gals/Min | ||