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 results of a test on a British Goodrich No B20B vee-belt.
| Identifier | ExFiles\Box 135\1\ scan0265 | |
| Date | 1st March 1938 | |
| VEE-BELT TEST - BRITISH GOODRICH No B20B No 1 PULLEY ANGLE - 33°-56' BELT PERIPHERY - EXTERNAL - 49 15/16" INTERNAL - 46 5/16" LIFE - 2 HOURS 5 MINS. REVS PER MIN 4300 4200 4000 Vee Centres adjusted Slip excessive. Belt grooved longitudinally on outer periphery. H.P. 25 20 15 HOURS 1/2 HR MINS DIAGRAM No 892 T.P. 3.38 | ||