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 with hexagonal-ended copper tubes versus old round-ended tubes.
| Identifier | ExFiles\Box 105\1\ scan0165 | |
| Date | 30th November 1931 | |
| To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. Eg. Wor.{Arthur Wormald - General Works Manager} C. Ex. Da.{Bernard Day - Chassis Design} Py. X5250. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}4/AD30.11.31. 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} | ||