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).
Modifications to the Phantom III fan to improve deficient low-speed cooling by increasing its speed.
| Identifier | ExFiles\Box 94\3\ scan0050 | |
| Date | 4th June 1936 | |
| X 340 To RHC.{R. H. Coverley - Production Engineer} Hs{Lord Ernest Hives - Chair}/Std.7/KW.4.6.36. Phantom III Fans. As the result of tests recently carried out at Brooklands and on the Continent, it is evident that the Ph.III is definitely deficient in low speed cooling. To remedy this we propose to make the fan more effective - (1) by raising its speed, (2) by altering its size and construction. The latter method we shall try out here, but we want Hancock to get a quick test on 32-EXZ with the fan speed raised as this would be easily standardised if successful. We require to raise the speed of the fan by 25%; i.e., the ratio of fan speed/engine speed should be 1.12 instead of .89 as at present. This can be done by using new fan pulleys, interchanging the diameters of the existing driving and driven pulleys thus - External dia. of present driving pulley E.85120 - 5.100" " " " present driven pulley E.85919 - 5.675" " " " new driving pulley to be - 5.675" " " " new driven pulley to be - 5.100" The existing belt can thus be used. Will you please have the necessary pulleys details and made, so that Hancock can test them at the earliest opportunity. Hs{Lord Ernest Hives - Chair}/Std. | ||