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).
Test report on a Gates Vulco belt, detailing its performance and failure analysis.
| Identifier | ExFiles\Box 135\1\ scan0233 | |
| Date | 28th October 1938 | |
| 28th. October 1938. Gates Vulco No.22316. Lab Ref. 8448. Pulley diameter 3.875" angle 34°-12' Belt periphery external start 42-13/16" after 10 hrs 27 mins 43-1/16" after 11-3/4 hrs(end) 43-1/4" Belt periphery internal start 38-15/16 after 10 hrs 27 mins 39-1/4 after 11-3/4 hrs(end) 39-7/16 Initial centres 12-3/8" Fan speed 4060 to 4440 R.P.M. Driven speed 4240 to 4500 R.P.M. % Slip Initial 5.6 Average 2.0 Minimum 1.3 H.P. 1st. fan 24 H.P. 2nd. " 19 H.P. Temperature of running - 125°F V centres adjusted once to 12-5/8" after 5 mins. running. Total running time - 11 hrs. 45 mins. Cause of collapse - At 11-3/4 hrs. belt cords gave, producing a "waist" whilst under tension, thus | ||