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 on anti-freezing mixtures comparing a 33% Glycerine solution with pure water in a 20 HP radiator.
| Identifier | ExFiles\Box 105\1\ scan0048 | |
| Date | 12th December 1929 | |
| +5250 Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}12/12.29 XS250 XJ250, X45T5. X1435 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. 10 Pints Glycerine & 22 pts. Water. Time in mins. Water temp. Water Temp. Start 70°C. 70°C. 1/2 71.6 71 1 73.4 72.6 1 1/2 74 73.6 2 74.8 74.5 2 1/2 75.5 75 3 76 75.6 3 1/2 76.5 75.7 4 76.3 75.6 4 1/2 76.3 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. | ||