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).
Series of graphs comparing belt drive performance, spring tensions, and the effect of temperature on belt slip.
| Identifier | ExFiles\Box 75\3\ scan0202 | |
| Date | 25th July 1923 | |
| COMPARISON OF DRIVES FAN PULLEY REVS: DYNAMO SHAFT DRIVE 857, CRANKSHAFT DRIVE 1019 DRIVER REVS: 1000 % OF SLIP OF BELT ENGINE R.P.M. 16 LBS TENSION 18 LBS TENSION 20 LBS TENSION 16 LBS 20 LBS 18 LBS COMPARISON OF SPRINGS DRIVE OFF CRANKSHAFT PULLEY WORKING LENGTH OF SPRING 4.6" % OF SLIP OF BELT 18 LBS 27 LBS 40.5 LBS % OF SLIP INCREASE OF SLIP WITH BELT TEMP. 1ST RUN COLD, 2ND, 3RD, 4TH, 5TH HOT, 6TH CRANKSHAFT DRIVE 3,000 R.P.M. 16 LBS TENSION ROLLS-ROYCE, LIMITED ? ROOM 25. JUL 23 UL. | ||