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 results for a Dayton Cog VC 17 belt, detailing performance data and the reason for test cessation.
| Identifier | ExFiles\Box 135\1\ scan0221 | |
| Date | 22th September 1938 | |
| 22nd. September 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 - 19 16 3rd. fan - 24 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. | ||