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 discussing spring suspension, riding quality, and moment of inertia, referencing external research articles.
| Identifier | ExFiles\Box 43\2\ Scan173 | |
| Date | 15th September 1926 | |
| Oy1-E-91526 September 15, 1926 Mr. Basil Johnson, Rolls-Royce, Ltd., London, England. (Copy for attention of Mr.F.H.Royce " " " Mr.E.W.Hives " " " Mr.B.I.Day) Dear Sir: Re Riding Quality May we refer your attention to the article by F.{Mr Friese} C. Mock on Spring Suspension and riding qualities in the S.A.E.Journal for September. We believe that this article, read in conjunction with Mock's article in the S.A.E.Journal for July 1925, contains valuable and practical suggestions. On page 295 of the later article he quotes as one of his best combinations a front deflection of 2-3/4" and rear of 5". I think this is close to the 20 hp. figures. He also confirms Rowell's statement of March 23rd that, as applied to existing cars, it appears desirable to concentrate weight over the wheels. This would be a particular case of Rowell's "K^2 = ab" law, which calls for a greater moment of inertia for a given wheelbase than is usual in present practice, in order that the action of the spring suspension shall be independent at either end. The results of some incomplete work on this were given in Oy1-E-5426 addressed to yourself and Mr. Royce, in which it was proposed that we might obtain the actual moments of inertia of standard body types by swinging complete cars. Yours very truly, Maurice Olley MO/E | ||