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 for a Dayton Cog VC 17 belt, detailing performance metrics.
| Identifier | ExFiles\Box 135\1\ scan0234 | |
| Date | 28th October 1938 | |
| 28th. October 1938. Dayton Cog VC 17. Lab. Ref. 8448. Pulley diameter 3-21/32" angle 33°56' Belt periphery - external start 42-13/16 end _ Belt periphery - internal start 38-5/8 end _ Initial centres - 12.7 Fan speed - 4000 - 4360 Driven speed - 4100 - 4480 % Slip Initial 4.4 Average 7 Minimum 1.8 Maximum 9.8 H.P. 2nd. fan - 16 3rd. fan - 21 V centres adjusted 5 times to maximum V centre possible = 13.7" = 2" elongation Test stopped because excessive slip and all adjustment used, after 6 hrs. | ||