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).
Use and effects of Ethylene Glycol as a high-temperature coolant for engines.
| Identifier | ExFiles\Box 151\3\ scan0095 | |
| Date | 26th July 1929 | |
| To Rg. {Mr Rowledge} from Lr. {Mr Ellor} c. to R. {Sir Henry Royce} Hs. {Lord Ernest Hives - Chair} By F. {Mr Friese} Wor. {Arthur Wormald - General Works Manager} X1435 Lr {Mr Ellor} 4/AD26.7.29. HIGH TEMPERATURE COOLING. Mr. Fedden has just recently returned from America and he kindly gave me the following excirpt from his notes :- "High Temperature Cooling. The latest information with regard to the use of Ethylene Glycol as a cooling medium is as follows :- 2½% of water is added to the Ethylene Glycol in its pure state. Its boiling point is then 420°F. {Mr Friese} Freezes at 40°. Satisfactory running cannot be obtained with less than 8½ C/C of Ethyl Fluid, and when tried on the Curtiss D.12 Engine, a drop of 3% in BHP. was observed, the weakest maintained fuel consumption being .44 lbs/BHP/HR. It is also interesting to note that the radiator frontal area is reduced by 2/3rds and not to 1/4" as stated in some of the American Journals. Further, they are definitely of the opinion that the adoption of this type of cooling necessitates the redesign of piston and cylinder." R.A.E. Farnborough, are also carrying out tests with Ethylene Glycol on the Napier Lion Engine. So, far they find the heat to jacket water is | ||