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 square versus round radiator tubes for performance and cost.
| Identifier | WestWitteringFiles\U\August1930-November1930\ Scan132 | |
| Date | 20th October 1930 guessed | |
| -2- we use 7 m.m. square tubes expanded horizontally only, and arranged with bilges for turbulence we shall have a radiator that is about 10° C. better than our present standard and one that will not be so expensive as the 6 m.m. tube. It appears that the sq. tube will always be more expensive than the equivalent round tube, but some expense can be saved by avoiding sizes below 7 m.m. It is possible that we may be able to improve the round tube still further and we are making tests in this direction. HS{Lord Ernest Hives - Chair}/An. | ||