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).
Performance comparison chart of top water temperature during a hill climb for three car models with different radiator configurations.
| Identifier | ExFiles\Box 66a\4\ scan0295 | |
| Date | 27th May 1929 | |
| TEST CAT AND FIDDLE HILL NO BONNET VENTILATION AIR TEMP 15°C. EACH CAR CARRIES 3 PASS AND 5 CWT. BALLAST ① S.S. CAR 22 EX WT. EMPTY 48.3 CWT ② PHANTOM CAR 14 EX. WT. EMPTY 49.75 CWTS. ③ OLD PHANTOM CAR 18 Y.C. WT. EMPTY 52.25 CWTS. TOP WATER TEMP C° CLIMB MILES. Diagram 1: F.2.B. PHANTOM, 4.25", 24.25, FRONT AREA 500 □", VOLUME 2500 CU.INS. Diagram 2: 14 EX. PHANTOM, 4.8", 23.2, 24.5", FRONT AREA 568 □", VOLUME 2720 CU.INS. Diagram 3: S.S. SMALL TUBE, 4.00, 26.25, 23 3/4, FRONT AREA 625 □", VOLUME 2500 CU.INS. | ||