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).
Joggling test results for Model Cranks, design 2070 A & B, including a diagram of a typical fracture.
| Identifier | ExFiles\Box 52\4\ Scan049 | |
| Date | 10th February 1934 | |
| MODEL CRANKS - DES 2070 A & B JOGGLING TEST. STROKE 6" LEVEL B.S' RADIUS. D64B FLYWHEEL - MOMENT OF INERTIA INCREASED BY 30%. CRANK INDEX | TIME RUN | TOTAL REVERSALS | AVERAGE RPM | REMARKS. A1 | 41H. 5M. | 1,439,820 | 290 | RUN DAY PERIODS. A2 | 24H. 13M | 840,280 | 286 | RUN DAY & NIGHT A3 | 48H. 15M. | 1,653,840 | 287 | " " " # A4 | 32H. | 1,105,660 | 288 | " " " B1 | 71H. 26M. | 2,463,600 | 288 | RUN DAY PERIODS. B2 | 99H. 20M. | 3,355,180 | 282 | RUN DAY & NIGHT #* B3 | 39H. 25M. | 1,346,400 | 284 | " " " B4 | 56H. 57M. | 1,954,500 | 286 | " " " #++ .880 DIA JOURNAL BORE - FLYWHEEL END - WAS + .018 # SHORT STOPS FOR ADJUSTMENTS. * STOPPED DURING WEEK-END. ++ CONNECTING TUBE FRACTURED AFTER 21 HRS. FLYWHEEL FLANGE TYPICAL LINE OF FRACTURE ROLLS-ROYCE, LTD TEST ROOM FEB 19 1934 DERBY - H Bell | ||