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).
Table evaluating the performance of different radiator matrix heights and depths at a road speed of 30 m.p.h.
| Identifier | ExFiles\Box 22\1\ Scan218 | |
| Date | 25th November 1924 guessed | |
| SHEET 1. VALUE OF INCREASING MATRIX HEIGHT ALSO REDUCING DEPTH. No ventilation. Matrix details. SC % difference from 'A'. Critical atmospheric temperature. STANDARD. Matrix height 20 1/4" Depth 4.8". 77°C 'A' 18°C LARGE STANDARD. Matrix height 21 1/4" Depth 4.8". 74.5°C 3.3% Improvement. 20.5°C EAC. TUBES. Matrix height 21 1/4" Depth 4.4". 77.5°C .65% Improvement. 17.5°C Matrix height 22 1/4". Depth 4.8". 70°C 9% Improvement. 25°C Matrix height 23 1/4" Depth 4.8". 68.5°C 11% Improvement. 26.5°C Figures for road speed of 30 m.p.h. | ||