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).
Technical comparison of different radiator tubes and a Gallay radiator core.
| Identifier | ExFiles\Box 29\3\ Scan289 | |
| Date | 14th October 1930 | |
| -3- At higher speeds, however, the difference becomes appreciable, presumably due to the greater free air area of the square tube. (4) 5L/7 Round Tubes. These results again confirm that this tube, which was fitted to half a series of P.II. core, is slightly more efficient than the 6/7½ tube which is at present standard. (5) Gallay Radiator. Tin-bag ribbon direct. This is the radiator core fitted to 6 cylinder Bentley cars. It is not really the Gallay Co's. latest matrix as we found out in Paris as it has no indirect cooling. However, various Bentley owners have quoted their cars against P.II's for cooling. Hence we took advantage of the Co's offer to test it. It will be seen that its efficiency is only moderate. Its weight filled with water is 14 lbs. less than our standard but this will be little less than the square tube radiators when made with hollow strips. Advertently or inadvertently, the Gallay Co. have introduced various kinks into their ribbons which must promote air turbulence. This type of core is difficult to repair if leaks start. On the other hand it is questionable policy to patch up a matrix once corrosion has started. | ||