Blueprint for a counterweighted crankshaft for a 20 HP engine, detailing its expected benefits.
| Identifier | ExFiles\Box 25\3\ Scan375 | |
| Date | 29th October 1928 | |
| COUNTERWEIGHTED CRANKSHAFT - FOR 20 HP ENGINE. Fig 4 WHICH SHOULD GIVE: 1) GREATER SMOOTHNESS AT HIGH RPM. 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. 13 NOV 1928 Tsm. 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).