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).
Comparison of crankshaft equivalent lengths and natural frequencies for the B.60 and Phantom III engine systems.
| Identifier | ExFiles\Box 132\2\ scan0189 | |
| Date | 26th October 1940 guessed | |
| 6. CRANKSHAFT EQUIVALENT LENGTHS (By Carter's Formula). | | B.60 | Ph.III | |---|---|---| | Crankpin | 4.1 | 3.94 | | Journals: front | 2.42 | 3.32 | | rear | 2.9 | 3.32 | | centre | 2.64 | 3.32 | | inter | 2.1 | 2.36 | | Web | 5.65 | 4.0 | NATURAL FREQUENCIES. Natural frequency of B.60 system 15150 vib/min. " " " flat 12 cyl. system 12440 vib/min. For the sake of comparison these frequencies have been calculated for systems having no crankshaft dampers and no masses in front of No.1 main bearing. Rmf/as | ||