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).
Diamond engine mounting, comparing Phantom I and Phantom II frame stiffness and discussing the use of subframes.
| Identifier | ExFiles\Box 14\5\ Scan256 | |
| Date | 1st December 1931 | |
| 87005. To Sg.{Arthur F. Sidgreaves - MD} From Hs.{Lord Ernest Hives - Chair} Hs.{Lord Ernest Hives - Chair}3/MJ.1.12.31. x7380. DIAMOND ENGINE MOUNTING. Replying to Sg.{Arthur F. Sidgreaves - MD}12/El6.11.31. On the last batch of Phantom l cars which had rubber engine feet at the rear, the stiffness of the frame was not very much different to Phantom ll with Diamond engine mounting. On these cars, as on Phantom ll with Diamond engine mounting, the engine did not add any stiffness to the frame. The Phantom l car, however, having a separate gearbox the first cross member was slightly in front of the present position on Phantom ll. All Phantom l cars were run without subframes. In our opinion, the risk of producing Phantom ll cars without subframes is very small, but there is only one way to prove it and that is to produce some cars and have them running about. Hs.{Lord Ernest Hives - Chair} | ||