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).
Request to produce experimental fan sets with higher speed ratios.
| Identifier | ExFiles\Box 75\3\ scan0081 | |
| Date | 2nd April 1925 | |
| To RHC.{R. H. Coverley - Production Engineer} c. to EFC. X1017 By/SS{S. Smith}4/DB{Donald Bastow - Suspensions}2.4.25 EAC.VI - FAN - HIGHER SPEED RATIOS. X.8220 X.1017. With reference to Mr.Clarke's request for further speed ratios in connection with the EAC. fan, please produce one experimental set of each of the arrangements shown on Scheme 633 attached. According to the Whittle Belt Catalogue contact point the present std: ratio is 1.12 to 1 - on the same basis we have calculated the 1.2 and 1.3 ratios. As an alternative you may try a 1.2 to 1 ratio by using Spring Drive Pulley E.73463 in conjunction with the present std. fan pulley. Will you please make the necessary fan belt length adjustment. Two prints of each of the following drawings attached :- E.73463 - Pulley Rim. E.73464 - Distance Washer. E.73465 - Tubular Rivet. Scheme 633 - Alternative Fan Speed Ratios. By/SS.{S. Smith} | ||