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).
Improvements to vehicle cooling systems, focusing on radiator tubes, materials, and summarizing problems with solutions.
| Identifier | ExFiles\Box 15\1\ Scan120 | |
| Date | 25th July 1929 guessed | |
| -3- [Handwritten]: it would be [Handwritten]: advisable In view of all the facts, we think we ought at once to use 7/5½ m.m. tubes in the S.S. radiator to decrease the hydraulic restriction of the matrix. Tests we have so far carried out with a radiator built of these tubes shew that with them we shall be definately better off than F.2 B series [strikethrough]but not so good as V series[/strikethrough] (For circulation.) We think we may be able to effect further improvment by reducing the lips of the top tank which at [strikethrough]present[/strikethrough] obstruct the top row of tubes somewhat.(Length of top row water space given below.) We are also trying to find a protective coating for the water passages in the cylinder head. For those cars in F.2 B series that are giving trouble persistently we think we should also supply matrices with 1.5 m.m. gaps between the tubes. Summarising the position - POSSIBLE SOURCE OF TROUBLE. PROJECTED OR ADOPTED MEANS OF DEALING WITH IT. Lubricating oil getting into the cooling system. On lubricated chromium plated water pump spindles. Colloidal Aluminium Hydroxide formed in head and choking tubes. Investigation of treating water passages with linseed oil or other protective coating. Insuffucuent margin of water passage in the radiator matrix causing premature re-striction by any foriegn body. Gap between tubes increased from 1 m.m. to 1.5 m.m. Top tank modified to reduce obstruction. | ||