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).
Test results for a Mark III heater matrix and recommending its adoption over the Mark V.
| Identifier | ExFiles\Box 137\3\ scan0125 | |
| Date | 16th August 1939 | |
| 11584 1280 To By.{R.W. Bailey - Chief Engineer} c. to By/NS.{Norman Scott} c. to By/RD. c. to Lds. Rm{William Robotham - Chief Engineer}/Ed.{J. L. Edwards}5/JH.16.8.39. R.R. Marston Heaters. We have received a letter from Steadman giving particulars of tests carried out on a Mark III matrix compared to a Mark V as fitted to our car heaters - showing the former unit to give 92.5% of the heat delivery of the latter, with a 7% greater air flow. He states that the Mark III matrix is considerably better from the manufacturing side and in view of the above figures we do not feel that the difference in efficiency would be noticed by the occupants of the car. We recommend, therefore, that details be modified to incorporate a Mark III matrix block and that a print be forwarded to John Marstons immediately. Rm{William Robotham - Chief Engineer}/Ed.{J. L. Edwards} | ||