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).
Graph of crankshaft torsion tests comparing torque vs. twist for various Phantom & 20 HP crankshaft configurations.
| Identifier | ExFiles\Box 31\2\ Scan074 | |
| Date | 7th December 1927 | |
| GRAPH 2. CRANKSHAFT TORSION TESTS. PHANTOM & 20 H.P. TABLE DATA: CURVE | CRANKSHAFTS & CONDITIONS | STIFFNESS LBS.FT./RAD 2 | STD. PHANTOM. SEVEN BEARINGS | 45,000 3 | STD. PHANTOM. BEARINGS 1-4-7. | 42,100 5 | SPORTS PHANTOM. (E.76546) 7 BEARINGS. | 38,820 6 | DITTO. BEARINGS 1-4-7. | 30,600 1 | 20 H.P. STD. PARTLY MACHINED. OPERATION.15 | 53,000 4 | 20 H.P. STD. PARTLY MACHINED. OP. 19 | 41,400 7 | 20 H.P. STD. PARTLY MACHINED. OP. 21. | 27,200 8 | 20 H.P. STD. PARTLY MACHINED. OP. 22. | 25,600 9 | 20 H.P. STD. PARTLY MACHINED. OP. 31. | 22,800 10 | 20 H.P. STD. PARTLY MACHINED. OP. 33 A.{Mr Adams} OP. 39.A. | 17,400 11 | ALSO STD. 20 H.P. 7 BEARgs. | 16,400 12 | STD. 20 H.P. BEARINGS 1-4-7. | 15,400 13 | STD. 20 H.P. 1-7. | 15,280 Y-AXIS LABEL: LBS FT TORQUE ON NOSE X-AXIS LABEL: DEGREES TWIST IN SHAFT GRAPH ANNOTATIONS: CURVE 1. CALCULATED FIG. FOR 6 CYL. SHAFT LIKE STUTZ. | ||