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).
Performance test results for various V-belts, detailing horsepower, running times, and failure modes.
| Identifier | ExFiles\Box 135\1\ scan0244 | |
| Date | 8th November 1938 guessed | |
| - 5 - Gates Vulco No.22316 (continued) H.P. 1st fan 19 - 25 H.P. 2nd " 18 - 21 H.P. Average H.P. (all test) 22.6 H.P. " H.P. x hrs 265.55 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. Ferodo Ferogrip No.1 Pulley diameter (base of vee) 3-15/16" " angle 35°30' Belt periphery at start external 43-15/16" internal 40-5/8" Fan speed 3800 - 4520 Driven speed 4050 - 4620 Initial centres 13-7/16" % Slip initial 7.3 average 3.5 minimum 1.1 maximum 7.3 H.P. 4th fan 16 - 21 5th " 21 - 22.5 Average H.P. (all test) 19.7 Average HP x hrs. run = 101.77 Temperature of running 120°F Vee centres adjusted once only. After 5 hrs. 10 mins. the belt turned over in the pulleys. Ferodo Ferogrip No.2 Pulley diameter (base of vee) 3-15/16" " angle 35°30' Belt periphery at start external 43-15/16" internal 40-1/2" " " at finish (belt distorted) external 44-5/16" internal 40-1/2" Fan speed 3850 - 4330 Driven speed 4200 - 4500 Initial centres 13-1/4" % Slip initial 10.0 average 3.8 maximum 10.0 minimum 2.78 H.P. 5th fan 20 - 23 6th " 18 - 20 Average H.P. (all test) 21.45 " HP x hrs. run = 506.57 Vee centres adjusted twice in first 18 minutes, again at 17 hours 47 minutes and finally on fitting the 6th fan at 22 hrs. 57 mins. After 23 hrs. 37 mins. the belt turned over and rode off the pulleys. - continued - | ||