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 comparing crankshaft dimensions, twist, and stiffness for various engine models.
| Identifier | ExFiles\Box 137\4\ scan0003 | |
| Date | 8th April 1929 | |
| Vertical text right: CRANK SHAFT STIFFNESSES. TABLE 1. SHOWING CORRECTIONS APPLIED TO OBTAIN A TEST STIFFNESS. Vertical text left: TEST 28/3/29 Top Table Section: Row 1 Headers: PART NUMBER., ENGINE., LENGTH OF NOSE OF SHAFT. INCHES., OUTER DIA. OF NOSE INCHES., INNER DIA. OF NOSE INCHES., EXTRA LENGTH OF MAIN BEARING INCHES., OUTER DIA. OF MAIN BEARING INCHES., INNER DIA. OF MAIN BEARING INCHES. Row 2 Data: 13C, E.78216, STD. PHANTOM., 3.200, 1.750, 1.750, 2.950, 2.625, 1.500 Row 3 Data: 14C, E.52064, STD. 20 H.P., 2.800, 1.400, 1.625, 1.725, 2.000, 1.250 Row 4 Data: 15C, E.81976, EXPL. STIFF 20 H.P., 2.800, 1.400, 1.625, 1.750, 2.125, 1.250 Row 5 Data: 16C, E.{Mr Elliott - Chief Engineer} 18881, 1-G-1. EXPL. 20HP, 4.750, 1.490, 1.100, 2.125, 2.000, 1.250 Bottom Table Section: Row 1 Headers: MEAS. STIFF-NESS, WHOLE SHAFT. LBS. FT./RAD., TWIST IN NOSE RADIANS., TWIST IN EXTRA LENGTH OF JOURNAL RADIANS., TWIST IN CRANKS ONLY RADIANS., STIFFNESS OF CRANKS ONLY LBS. FT./RAD., STIFFNESS OF ONE CRANK LBS. INS./RAD. x10^6, CALC. STIFF. OF ONE CRANK LBS. INS./RAD. x10^6, RATIO: CALC. STIFF. / TEST STIFF. Row 2 Data: 13C, 45,000, .1648, .0494, .7858, 57,250, 4.120, 4.250, 1.031 Row 3 Data: 14C, 16,350, .1135, .0343, .8522, 19,180, 1.381, 1.460, 1.057 Row 4 Data: 15C, 19,630, .1363, .0195, .8442, 23,250, 1.675, 1.985, 1.185 Row 5 Data: 16C, 14,750, .12095, .0358, .7527, 19,520, 1.407, 1.450, 1.030 | ||