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).
Table detailing propeller shaft lengths and their safe maximum speeds for various chassis types.
| Identifier | ExFiles\Box 2\1\ B002_136 137-page26 | |
| Date | 6th February 1933 | |
| To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} c.c. Rg.{Mr Rowledge} Hax. c.c. K.{Mr Kilner} Dn. c.c. By.{R.W. Bailey - Chief Engineer} Hdy.{William Hardy} X137 Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}1/ET.6.2.33. PROPELLER SHAFTS. HL/ML.2.33. We are sending you a table of the lengths of the propeller shafts between universals on our various chassis, together with an estimate of the safe maximum speed, assuming 4000 R.P.M. for the 20/25. This figure was obtained on 19.0.IV. when fitted with a J.I. unit. Length. Safe Speed RPM. 20/25. 3" Dia. Peregrine long type. 54.875 4000 3" Dia. Peregrine short type. 46.750 5750 3" Dia. Peregrine short type. 41.250 7000 2¾" Dia. Peregrine short type. 41.250 5200 3" Dia. J.III. 54.875 4000 3" Dia. Newport. 52.875 4300 3" Dia. Peregrine to run 5000 RPM. 49.000 5000 We should not, therefore, expect to be able to run a Peregrine chassis up to 5000 RPM. with a shaft longer than 49", and would rather that it were shorter. Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} | ||