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).
Letter comparing Duren and M.R. Ferodo materials for drums.
| Identifier | ExFiles\Box 90a\2\ Scan028 | |
| Date | 10th June 1934 guessed | |
| favour of Duren as compared with: M.R. Ferodo. Duren does not get tired anything like as quickly. I might add that I was using special Nitralloy drums which were made for me by Messrs Hadfields of Sheffield, but I see no reason why the Duren should not prove to be superior as regards temperature. When I last visited Derby your Mr. Sills arranged to make some wing stays from specially tempered steel. Kind regards, Yours Sincerely S.D. Hall | ||