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 load conditions for a 25 HP engine.
| Identifier | WestWitteringFiles\V\December1930-February1931\ Scan160 | |
| Date | 20th January 1937 guessed | |
| 25 H.P. CRANKCASE DEFLECTIONS CRANKCASE SUPPORTED BY TWO END MAIN BEARINGS, LOAD APPLIED TO CENTRE MAIN BEARING. Y-AXIS: DEFLECTION IN INCHES VALUES: .001, 2, 3, 4, 5, 6, 7, 8, 9, .010, 11 X-AXIS: LOAD IN LBS VALUES: 100, 200, 300, 400, 500 LINE LABELS AND CONDITIONS: - CENTRE OF MIDDLE BRG CAP: HORIZ. LOADING BLOCK OFF. - SIDE OF MIDDLE BRG CAP: HORIZ. LOADING BLOCK OFF. - EDGE OF CRANKCASE: HORIZ. LOADING BLOCK OFF. - CENTRE & SIDE OF MIDDLE BRG CAP: HORIZ. LOADING BLOCK ON. - EDGE OF CRANKCASE: HORIZ. LOADING BLOCK ON. - MIDDLE BRG CAP: VERT. LOADING BLOCK OFF. - MIDDLE BRG CAP: VERT. LOADING BLOCK ON. 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. | ||