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 the performance results of a Vee-Belt test on a British Goodrich N.8620B No.2 belt.
| Identifier | ExFiles\Box 135\1\ scan0266 | |
| Date | 7th December 1938 | |
| VEE-BELT TEST - BRITISH GOODRICH N.8620B N.o.2. PULLEY ANGLE - 33° 56' BELT PERIPHERY - EXTERNAL - 50 1/4" INTERNAL - 46 1/8" LIFE - 7 HOURS. 40 MINS. Revs per Min. 4600 4400 4200 4000 Flat Belt adjusted Without Stop Stop for night Week end Stop Slip excessive. Belt stretched at one place forming a well defined waist. Flat Belt broken Vee Belt adjusted HP 25 20 H.P. 15 HOURS. Mins DIAGRAM N.o. 893 7.12.38 | ||