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 test rig results from a visit to John Marston Ltd, comparing different matrix types.
| Identifier | ExFiles\Box 149a\2\ scan0256 | |
| Date | 6th November 1935 | |
| To E.{Mr Elliott - Chief Engineer} c. to By.{R.W. Bailey - Chief Engineer} X1280 Hs{Lord Ernest Hives - Chair}/Std.14/KW.6.11.35. Report on Tests carried out and information gathered during visit to Messrs. John Marston Ltd., Wolverhampton, and attempts to correlate rig test figures with road and Brooklands tests. The visit was made in order to see Messrs. John Marston's radiator test rig in action, to use it to confirm their comparisons between the latest American type of matrix (Harrison Vee bonded) and their copy of this, i.e., the Marston Mark VI matrix, and to collect any figures which they could give us relating to heat dissipation and air speeds with Mark V and Mark VI matrixes. Owing to lack of time it was only possible to carry out tests comparing the Marston Mark V and Mark VI 52 m.m. Bentley matrices at one car speed, i.e., 30 m.p.h., and giving a heat dissipation curve at various car speeds for the Bentley 52 m.m. Mark VI matrix. However, Marstons supplied us with test figures taken by themselves on the same rig, for various other matrices and conditions. The results of all these tests, including both the ones carried out by Marstons and ourselves, are shown on the attached graphs - Nos. 1 to 6 inclusive. Description of Rig. The rig used consists of a closed circuit duct into which the radiator to be tested is fitted, and through which air is circulated by means of an electrically driven fan, all the air being made to pass through the matrix. By means of bypass valves, cold air can be admitted and hot air released in order to control the air temperature. Water is circulated through the radiator matrix by a variable speed electrically driven water pump, via the water jackets of a 20 HP. Austin engine, which is used to provide the heat to be dissipated. Temperatures of both air and water (inlet and exit) are measured by means of distant reading transmitting thermometers. | ||