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).
Comparative specification chart for various 20 HP car crankshafts.
| Identifier | ExFiles\Box 6\1\ 01-page162 | |
| Date | 3rd May 1936 guessed | |
| R.R. CAR CRANKSHAFTS. 20 H.P. | PART No. | DESCRIPTION | TYPE OF AUX. GEAR DRIVE | ITEMS SHAFT, WHETHER BEVELLED | OILING SCHEME | FETTER STIFFNESS WHOLE SHAFT lbs. per 1/1000" defln | CR.{Mr Cra???ster / Mr Chichester}C.S. STIFF. | JOURNAL DIA. OUTER INNER | PIN DIA. OUTER INNER | PIN LENGTH | MAX WIDTH OF WEB | AXIAL LENGTH OF WEB | FEATURES | |---|---|---|---|---|---|---|---|---|---|---|---|---| | E 53844 | LATE SER. 20 H.P. | KEY & TAPER ON END | PLAIN ENDS, NOT BEVELLED AT ENDS | OIL CAPS TO THE BIG ENDS + SMALL ENDS. THRU' JOURNALS & THEN ZIG ZAG INSERTS + FINAL THRU' PIN | 16,350 | 1.820 | 2.000 / 1.250 | 1.500 / 0.750 | 1.500 | 2.200 | .740 | (1) C-TAIL VIB. EXCIT. (2) LITTLE COMPRESSION ON MATL. (STEEL) | | 54601 | LCC GHOST + S'DELEY | SPLINED FAN TYPE | Dº AS BEVELLED AT 1.G.I. ENDS | REVISED - OIL RING THROWER DISC & REVISED END THROWER THRU' PIN | 26,100 | 2.010 | 2.125" / 1.375" | 1.500 / 0.875" | 1.375 | 2.000 | .728 | (1) NEW SPRING DRIVE PROGRESSIVE OIL SCHEME (2) SMALLER JOURNALS (3) BIGGER DIA. (4) C.L.A.T. H-17.S. | | 12640 | LGE. LATER | KEY & TAPER S/G.{Mr Griffiths - Chief Accountant / Mr Gnapp} DRIVE | BEVELLED AT 60° | AS 53844 | | 2.310 | 2.125" / 1.125" | 1.500 / 0.750 | 1.500 | 3.000 | .728 | SIMILAR DIAMETERS BUT WIDER. U.S.O. TORSIONAL DRIVE | | 12643 | | KEY & TAPER S/G.{Mr Griffiths - Chief Accountant / Mr Gnapp} DRIVE | REVISED AT 25° | AS 53601 | | 3.020 | 2.125" / 1.125" | 1.750" / 0.875" | 1.500 | 2.250 | .725 | (1) LARGEST BENT. (2) WIDER WEBS | | 54701 | PRESENT STD. 20HP | KEY TAPER S/G.{Mr Griffiths - Chief Accountant / Mr Gnapp} DRIVE | STD '20HP' NO BEVELS | OIL CAPS (MALE 21981A THRU' JOURNAL & PIN) | | 2.140 | 2.000 / 1.500 | 1.500 / 0.750 | 1.500 | 3.000 | .775 | E.54642 WITH EXTRA WEBS | | 57127 | (HEAVY SERIES NO. H.G.T.A.) FUTURE STD. 20HP | KEY & TAPER S/G.{Mr Griffiths - Chief Accountant / Mr Gnapp} DRIVE | PLAIN SLIGHTLY BEVELLED AT 60° | As E58064 | | 2.450 | 2.125 / 1.125 | 1.750 / 0.875 | 1.500 | 3.250" | .725 | E.54642 ALT WITH STD. OILING SCHEME | | ||