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).
Notes on Ethylene Glycol coolant properties, operating temperatures, and related engine component findings.
| Identifier | ExFiles\Box 178\2\ img207 | |
| Date | 23th February 1934 | |
| -8- Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}14/KW.23.2.34. ETHYLENE GLYCOL. (1) Max. jacket temp. permitted on climb 300°F.{Mr Friese}, usual operating temp. 250°F.{Mr Friese} which they are not supposed to exceed. (2) They cruise at 230°F.{Mr Friese} (3) They employ cellular oil coolers with long tubes and special prevention for freezing up, but will get more information at Wright Field. (4) They do not as a general rule employ variable pitch air screws for their T.V. dives. They also attain about 40% over speed. Shall get further information on Aero stuff next week. Heron does not favour steel cylinder heads on the whole. Admits that the average screwed joint is not Glycol proof. With regard to freezing up, Heron says - (1) By using special materials (chrome plated copper carb. spindles etc.) and water jackets it is possible to keep all parts of the carb. above 32°F.{Mr Friese} when freezing will not occur. (2) They have proved, by feeding ice cubes into the carb., that ice itself does not harm an all aluminium rotor. All damage they have experienced due to nuts or bolts falling down air intakes! Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||