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).
Shaft balance specifications and tube thickness recommendations for the Phantom II shaft.
| Identifier | Morton\M9\ img071 | |
| Date | 21th October 1931 guessed | |
| -2- (5) Oakland cars run through within 3/4 oz. inch for balance and have to run smoothly up to 4000 r.p.m. (6) I did not know the thickness of the P.II shaft, but it scaled 1/8". You will note they recommend a bigger tube of only 14 gauge. This is SWG or .083 thick. M.Olley. | ||