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).
Radiator matrix design and cooling performance for Bentley and Phantom III models.
| Identifier | ExFiles\Box 150\3\ scan0052 | |
| Date | 28th August 1936 | |
| (3) However since we do not know when Marstons will be able to produce such a new type of core, it is of importance to get the matrix described above standardised at the earliest possible moment. In view of the above, we should like the Design Dept. to produce as soon as possible a design for a Bentley radiator with a matrix as described above, so that we can run it on the next Bentley doing 15,000 miles in France. (2) 25/30 HP. No actual test figures are available at the moment, except those given by GWR/INN in the report on 22-C-V in France. We estimate however that a matrix of the frontal area of the present matrix and of depth 52 m.m. would cool this car adequately. (Mark VI core) However with the present construction of radiator, it is impracticable to use a thinner matrix than 55 m.m. We therefore do not propose any change in the dimensions of the 25/30 matrix, but if the construction of matrix described above which we propose to test out on Bentley and Phantom III proves successful we shall adopt same on the present 25/30 matrix. In the case of the Wraith we think that the 52 m.m. matrix could be used (together with the lightened matrix construction), but we shall test this out when a car is available for the purpose. (3) Phantom III. This car of course represents our only real cooling problem and the position we have arrived at is that we think that with our present standard core and an improved fan running at higher speed (we are developing such a fan) we shall just about get away without any complaints of overheating. The critical air temperature under these modifications should be approximately 38-40°C. with 2½-3 lbs/sqin. pressure loading on system. Hs{Lord Ernest Hives - Chair}/Std. | ||