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).
Tests comparing radiator performance with a 33% Glycerine and water mixture versus pure water during hill climbing and high-speed driving.
| Identifier | ExFiles\Box 15\1\ Scan178 | |
| Date | 12th December 1929 | |
| X 7250. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}12/12.29 V 5250. X 7250 X 4516. ANTI FREEZING MIXTURES. Tests have been carried out on 20 HP. radiator comparing the mixture of 33% Glycerine and water, and pure water. As will be seen from the following figures, no difference sould be detected between these two conditions either for hill climbing or high speed work. SWINSCOE HILL. Full Throttle 30 m.p.h. Average of 3 runs. Air Temp. 6°C. 4 Galls. Water Only. Time in mins. Water Temp. Start 70°C. ½ 71.6 1 73.4 1½ 74 2 74.8 2½ 75.5 3 76 3½ 76.5 4 76.3 4½ 76.3 10Pints Glycerine & 22 pts. Water Water Temp. 70°C. 71 72.6 73.6 74.5 75 75.6 75.7 75.6 75.5 3rd. Gear. 43 m.p.h. Distance 6 miles. Water & Glycerine 79°C. OUT. 74°C. IN. Water only. 79°C. 75°C. | ||