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 table of crankshaft specifications and torsional stiffness values for various engines.
| Identifier | ExFiles\Box 6\1\ 01-page139 | |
| Date | 1st September 1927 | |
| Top Right: H/A/1 | 1.9.27 Right Sidebar: TORSIONAL STIFFNESS AND TEST OF CRANKSHAFTS | CALCULATED AND TEST VALUES Left Sidebar: J.L.TAYLOR | 2.1.28 TABLE: COLUMN HEADERS (Left to Right): 1. ENGINE (Row Labels) 2. PHANTOM I, ATM.NO.G.S., PART NO. E.7216 3. PHANTOM II, SPORTS, 1-9-T1, PART NO. E.70566 4. 20 H.P., PART NO. E.1889 5. 20 H.P., PART NO. E.52086 6. LORRAINE DIETRICH, WESTERN, PART NO. D.5765-2 7. STUTZ 8. INDIA, H.C. 3500, R/R, PART NO. H.C. 3650 E.29746 9. KESTREL 'F', R.R. AERO, PART NO. E.29667 TABLE ROWS: MAIN BEARINGS: NO. OF BEARINGS: 7, 7, 7, 7, 4, 9, 7, 7 OUTER DIAMETER: 2.6245, 2.6245, 2.000, 2.000, 1.890, 2.500, 2.125, 2.000 INNER DIAMETER: 1.500, 1.500, 1.250, 1.250, .800, 0, 1.375, O.D. 1.400 I.D. 1.100 LENGTH OF NO.1: 1.950, 1.950, 1.675, 1.525, 1.960, 1.850, 1.575, 1.750 LENGTHS OF NOS. 2,3,5&6: 1.800, 1.500, 1.050, 1.050, NO.3+5 2.025, *, 1.130, 1.750 LENGTH OF NO.4: 2.500, 2.500, 1.800, 1.550, -, NO.4+7 3.375, 1.630, 1.750 LENGTH OF NO.7: 3.000, 3.000, 1.800, 1.800, [blank], NO.8+9 3.750, 1.800, 1.700 CRANKPINS: OUTER DIAMETER: 2.124, 1.874, 1.500, 1.500, 1.771, 2.375, 1.500, 2.250 INNER DIAMETER: 1.125, 1.125, .875, .750, AERO .625, 0, .875, 1.700 LENGTH: 1.850, 2.000, 1.450, 1.500, A.4050, 1.400, 1.500, 2.150 NOSE: CRANK RADIUS: 2.750, 2.750, 2.250, 2.250, 2.889, 2.250, 2.250, 2.750 OUTER DIAMETER: 1.750, 1.700, 1.400, 1.400, 1.615, -, 1.400, - INNER DIAMETER: 1.100, 1.100, .625, .625, -, -, .625, - LENGTH: 3.200, 2.750, 4.750, 2.800, .690, -, 2.800, - WEBS: TYPE OF WEB: TAPERED, OVAL & TAPERED, TAPERED, PARALLEL, OVAL, OVAL + DEVELOPED, OVAL + REVERSED, OVAL + REVERSED MEAN WIDTH: 3.000, 3.200, 2.200, 2.200, 2.800, 3.380, 2.750, 3.750 DEPTH ALONG CRANKPIN: 1.065, .980, .730, .780, .765, .650, .730, .840 MEASURED STIFFNESS POUNDS - FT. PER RAD.: 45,000, 38,820, 14,750, 16,350, 29,350, 54,400, 26,100, 78,400 MEASURED VIBNS/RAD. CORRECTED VIBNS/RAD.: 4.12, 3.485, 1.406, 1.316, -, 5.228, 2.110, 5.65 CALC. STIFF. PER LEMAR (APPROX) x 10^6 - LBS. FT.: 4.25, 3.838, 1.480, 1.480, WHOLE SHAFT 28,000, 5.01, 2.020, 6.00 RATIO: CALCULATED STIFF / MEASURED STIFF: 1.030, 1.010, 1.070, .910, .960, .950, 1.060, [blank] | ||