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).
Comparison of square and round radiator tubes at full throttle and low speeds.
| Identifier | ExFiles\Box 29\3\ Scan291 | |
| Date | 14th October 1930 guessed | |
| COMPARISON OF SQUARE & ROUND TUBES AT FULL THROTTLE LOW SPEEDS. TYPES OF RADIATOR MATRIX. FULL THROTTLE TEST. CAR BRAKED TO MAINTAIN REQ'D SPEED. ALL CLOSED. 30 M.P.H. | 45 M.P.H. LOUVRED BONNET. 30 M.P.H. | 45 M.P.H. 6.mm. Parallel Square Tube E.{Mr Elliott - Chief Engineer} 81385. 21.5° C. | 24.75° C. Standard 6/7½ mm. Tubes. E.{Mr Elliott - Chief Engineer} 79448. 13° C. | 16° C. | 24° C. | 27.5° C. FIGURES GIVEN CRITICAL ATMOSPHERIC TEMPERATURE OR TEMPERATURE AT WHICH THE CAR WOULD EVENTUALLY BOIL IF DRIVEN FOR SUFFICIENTLY LONG UNDER THE CONDITIONS OF THE TEST. FIGURES WITH LOUVRED BONNET ACTUALLY RECORDED BUT SHOULD BE CONFIRMED. AT PRESENT USEFUL FOR COMPARING THE TYPES OF RADIATOR ONLY. | ||