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 Dayton Cog VC 17 belt, detailing measurements and test termination.
| Identifier | ExFiles\Box 135\1\ scan0204 | |
| 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 - 24 3rd " - 28 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. [Signature] | ||