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).
Information received from the U.S.A. regarding the Allison engine and associated cooling technologies.
| Identifier | ExFiles\Box 173\2\ img192 | |
| Date | 7th March 1934 | |
| COPY OF REPORT RECEIVED FROM Rm.{William Robotham - Chief Engineer} IN U.S.A. DATED 22.2.34. To Sg.{Arthur F. Sidgreaves - MD} from Hs{Lord Ernest Hives - Chair}/Rs.{Sir Henry Royce's Secretary} c. to Hgr. c. to RG.{Mr Rowledge} c. to E.{Mr Elliott - Chief Engineer} c. to Hy.{Tom Haldenby - Plant Engineer} c. to LF. c. to Wp. c. to F.{Mr Friese} c. to DA.{Bernard Day - Chassis Design} c. to Hdy.{William Hardy} BRIGHT FIELD. I gave you the somewhat sketchy information available on the Allison engine in my last letter. The interesting thing seems to be that they have had no trouble with the shrink fit of the liner so far. One can imagine it being proof against Glycol leaks but one wonders how it successfully cools at high M.E.P's. at the top, however, one cannot see that it should be materially worse than the air cooled. The head and liners as a unit might make a useful construction for the P.V. I shall be interested to know your findings as to the relative efficiency of the Pancake, Pent house, hemispherical, two and four valve heads. Other information from Bright Field - (1) Ethylene Glycol Radiators. Average Glycol radiator 9" depth, 175 sq.ft. total area, lowest area frontal used, 1.2 sq.ft. average 1.5 sq.ft. for Conqueror. Are being forced to use shutters with Glycol for temperature control. (2) Cold Corrosion Ethyl. They too have run into this, especially with Silchrome and Nitro Alloy. They use cold pressed castor and 2% Triethanolamine as a preventative during storage. (3) Glycol Temp. of Operation. They are coming to the conclusion that 300°F.{Mr Friese} is too hot for operation and that 250°F.{Mr Friese} is better, though they are running both. At 300°F.{Mr Friese} they get spots in the head as hot as the air cooled. | ||