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).
Series of radiator tests for the Phantom II model.
| Identifier | ExFiles\Box 15\1\ Scan156 | |
| Date | 28th September 1929 | |
| x7250. HS{Lord Ernest Hives - Chair}/AJL.2/MJ. 28.9.29. PHANTOM ll RADIATOR TESTS. ------------------------- We have carried out a series of tests to compare the efficiency of a Phantom ll radiator fitted with matrix tubes (E-79448/9) 7½-6 m.m. diam. with a similar radiator fitted with 7-5½ m.m. diam tubes. The space between the tubes is the same (1½ m.m.) in each case so that they should be equal as regards 'furring up '. Exhaustive tests were carried out both at high speeds and low speeds; a cooling test was also made. The high speed test consisted of measuring the water temperature increase during a six mile run at an average speed of 60 m.p.h. The low speed test was carried out on Swinscoe Hill, (approx: 3 miles in length) at an average speed of 25 m.p.h; the hill was climbed at full throttle and water temperature figures were recorded every half minute. The cooling curve was obtained by coasting down this hill in top gear at an average speed of 25 m.p.h., readings being taken every half minute. The results obtained shewed that there is no appreciable difference in efficiency between either of the sizes of matrix tubes used either during the high speed test, the low speed full throttle, or the cooling test. The actual figures obtained from averaging out the results of several tests do not show a difference in temperature exceeding 1°C. A second series of tests were carried out at high | ||