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).
Further bench experiments conducted on radiator fans, outlining a new apparatus arrangement.
| Identifier | ExFiles\Box 75\3\ scan0152 | |
| Date | 17th December 1924 | |
| To R.{Sir Henry Royce} & E.{Mr Elliott - Chief Engineer} from EFC. c. CJ. Da.{Bernard Day - Chassis Design} Rg.{Mr Rowledge} c. Wor.{Arthur Wormald - General Works Manager} Ry. X438 EFC1/T17.12.24. X.1017. FURTHER BENCH EXPERIMENTS ON RADIATOR FANS. X3438 Instead of continuing these experiments in the manner described in the last par. of our EFC2/T19.11.24, we have thought it better to rearrange the apparatus so that the axial thrust of the fan and the power to drive the fan can be taken at the same time. For this purpose, the revolving turntable with spring balance measurements of the thrust is retained, and the necessary arrangements made accurately to measure the electrical power supplied to the driving motor. The brake power delivered by the motor is obtained to quite a reasonable degree of accuracy by a suitable difference method, as previously outlined. In order to make it possible for the speed of the fan also to be simultaneously observable with the thrust and the power readings, the oscilloscope is now used and the blades of the fan are viewed on the background of the oscilloscope lamps, the speed of the fan being adjusted until the blades appear stationary in successive position. The oscilloscope speed itself is maintained constant at a definite value by its being caused to drive a small R.R. magneto generator, operating an electrical instrument. The speed of the motor driving the fan is also indicated in a similar manner. The results now obtained will entirely supersede those previously given. Where differences occur, it may be taken that the results now given more accurately represent the case. | ||