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).
Blueprint graph of crankshaft torsion tests for Phantom & 20 HP models, showing torque vs. shaft twist for various crankshaft conditions.
| Identifier | ExFiles\Box 6\1\ 01-page100 | |
| Date | 7th December 1927 | |
| GRAPH 2. CRANKSHAFT TORSION TESTS PHANTOM & 20 H.P. CURVE | CRANKSHAFT & 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.78546) 7 BEARINGS | 38,820 6 | DITTO BEARINGS 1-4-7 | 30,600 1 | 20 H.P. STD. PARTLY MACHINED OPERATION 15 | 53,000 4 | - OP. 19 | 41,400 7 | - OP. 21 | 27,200 8 | - OP. 22 | 25,600 9 | - OP. 31 | 22,800 10 | - OP. 33 A - OP. 35 A | 17,400 11 | ALSO STD COMP. 7 BEARGS | 16,400 12 | 20 H.P. BEARINGS 1-4-7 | 15,400 13 | STD. 20 H.P. BEARINGS 1-7 | 15,280 Y-AXIS: LBS FT TORQUE ON NOSE X-AXIS: DEGREES TWIST IN SHAFT Graph line labels: CURVE 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 CALCULATED FIG. FOR 6 CYL. SHAFT. LIKE STUTZ. | ||