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).
Comparison of weights and water capacities for 25 HP radiators using large hexagonal-ended copper tubes.
| Identifier | ExFiles\Box 181\M13\M13.2\ img016 | |
| Date | 30th November 1931 | |
| To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. Sg.{Arthur F. Sidgreaves - MD} Hgr. ORIGINAL Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}4/AE30.11.31. X5250. We have now got comparisons of the weights and water capacities of 25 HP. radiators with the large hexagonal-ended copper tubes. It is interesting to note that we save nearly 9 lbs. weight over the old standard 25 HP. radiator which had considerably less frontal area, and the hexagon tube radiator is some 12 lbs. lighter than the radiator to the same dimensions made with our old round ended tube. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||