Blueprint with notes on the design and benefits of a counterweighted crankshaft for a 20 HP engine.
| Identifier | WestWitteringFiles\T\November1928\ Scan132 | |
| Date | 29th October 1928 | |
| C.B/3 COUNTERWEIGHTED CRANKSHAFT · FOR 20 HP ENGINE. Fig 4 WHICH SHOULD GIVE: 1) GREATER SMOOTHNESS AT HIGH R.P.M. DUE TO TOTAL BALANCE OF ALL ROTATING WT. I.E. BIG-END, PIN, & WEBS, & THUS NEGLIGIBLE MAIN-BEARING LOADS, AT HIGH RPM. 2) TORSIONAL PERIOD ESTIMATED AT 4,290 RPM. STIFFNESS 62,100 LBS.FT./RAD. (4 TIMES > LATE STD. 20 H.P.) 3) 80% INCREASED BIG-END AREA. STAMP: 13 NOV 1928 DERBY Tsn. 29/10/28. | ||
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).