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).
Radiator core types, surface area analysis, and testing parameters.
| Identifier | ExFiles\Box 149a\2\ scan0351 | |
| Date | 1st April 1935 guessed | |
| - 3 - Morris. 3 row all copper. 2 row all copper. 2 row brass tubes, steel fins. Excelsior. 50 and 80 mm. Standard Brass. D2 and D4 Experimental Brass. D5 Experimental Copper. Photographs of sections of the various cores are attached, Nos: 8, 9, 10 and 11. The relation of the surface in contact with water and those in contact with air for the various types of radiators tested are as stated below : SURFACES PER SQUARE FOOT OF FRONTAL AREA. Core Type. Wetted Surface. Sq.ft. Surface Exposed to Air. Sq.ft. Ratio : Air Surface to Water Surface. 52 mm. Mark II 16.2 27.5 1.7 : 1 " " III 21.1 35.6 1.7 : 1 " " V 12. 46.6 3.86 : 1 " " VI 9.65 52. 5.4 : 1 50 mm. Excel. 15. 30. 2 : 1 2 row Morris 7.2 31.2 4.34 : 1 C. TESTS. The tests were carried out with a constant flow of water of 150 lbs. per minute passing through the radiator. The temperature of the water entering the radiator core was kept constant at 180°F.{Mr Friese} and the temperature of the air passing through the radiator was kept constant at 80°F.{Mr Friese} Readings were taken with varying air speeds ranging from 20 to | ||