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 No.22316 belt, detailing performance and cause of failure.
| Identifier | ExFiles\Box 135\1\ scan0205 | |
| Date | 22th September 1938 | |
| 22nd September, 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" " 11-3/4 hrs.(end) 43-1/4 Belt Periphery internal start 38-15/16 after 10 hrs 27 mins 39-1/4 " 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 27 - 34 H.P. 2nd " 24 - 26 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 | ||