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 showing crankcase deflections under various loads and conditions for a 25 HP engine.
| Identifier | ExFiles\Box 103\2\ scan0230 | |
| Date | 26th January 1931 guessed | |
| 25 H.P. CRANKCASE DEFLECTIONS CRANKCASE SUPPORTED BY TWO END MAIN BEARINGS; LOAD APPLIED TO CENTRE MAIN BEARING. Y-AXIS: DEFLECTION IN INCHES X-AXIS: LOAD IN LBS. GRAPH LINES AND ANNOTATIONS (from top to bottom): - CENTRE OF MIDDLE BRG CAP (Annotation: HORIZ. LOADING BLOCK OFF.) - SIDE OF MIDDLE BRG CAP (Annotation: HORIZ. LOADING BLOCK OFF.) - EDGE OF CRANKCASE (Annotation: HORIZ. LOADING BLOCK OFF.) - CENTRE & SIDE OF MIDDLE BRG CAP (Annotation: HORIZ. LOADING BLOCK ON.) - EDGE OF CRANKCASE (Annotation: HORIZ. LOADING BLOCK ON.) - MIDDLE BRG CAP (Annotation: VERT. LOADING BLOCK OFF.) - MIDDLE BRG CAP (Annotation: VERT. LOADING BLOCK ON.) BOTTOM TEXT: RELATIVE STIFFNESS OF CRANKCASE IN VERTICAL PLANE TO HORIZONTAL PLANE = 5:1 STIFFENING EFFECT OF CYL. BLOCK = 2 1/2 X. LOAD ON CENTRE DUE TO CRANKSHAFT ALONE AT 3000 R.P.M. = 2000 LBS. | ||