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).
Continuation of a report detailing tests on various radiator tube designs to improve performance and save weight.
| Identifier | ExFiles\Box 15\1\ Scan402 | |
| Date | 14th October 1930 | |
| Hs{Lord Ernest Hives - Chair}/Rml/AM14.10.30 contd. -2- confirming the figures in this test as though they are comparative we suspect that the car's performance was not 100%. We had hoped for over 10° improvement from this square tube radiator, and from other tests here reported we can only think that by going to a plain parallel tube we may have lost some turbulence ordinarily promoted by the expanded ends. There will be a saving of weight over standard on this radiator in its final form. (2) Standard Turbulent Air Flow Tubes 6/7½. These tubes were exactly the same as the standard tube except that four hemi-spherical bulges .020" deep were made at regular intervals in its length. The object of this test was (1) To determine whether a small amount of turbulence has an appreciable effect on the efficiency of a tube. (2) To ascertain if anything could be done to improve radiators being made . The results are most surprising and naturally require confirmation. So far they indicate that we can improve the standard radiator from 5° to 8.5°C. by this modification. we are carrying out low speed full throttle tests. (3) 6/7 mm. expanded square tubes. This test confirms that at 60 M.P.H. there is little if any difference between this and the 5½/7 mm. round tube. | ||