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).
Bench experiments on a 40/50 standard six-bladed radiator fan and the same fan with three blades removed.
| Identifier | ExFiles\Box 75\3\ scan0002 | |
| Date | 18th September 1924 | |
| To R & E.{Mr Elliott - Chief Engineer} from EFC. c. CJ. & PN.{Mr Northey} c. BY.{R.W. Bailey - Chief Engineer} DA.{Bernard Day - Chassis Design} EP.{G. Eric Platford - Chief Quality Engineer} c. RG.{Mr Rowledge} Wor.{Arthur Wormald - General Works Manager} X 1017 EFC1/T18.9.24. X. 3438 X.1017 BENCH EXPERIMENTS ON 40/50 STANDARD SIX-BLADED RADIATOR FAN AND ON THE SAME FAN WITH THREE BLADES REMOVED. (1) Power required to drive fan at various speeds. The fan was suitably mounted on the edge of one of our cast iron tables, and in such a way that the air delivered by the fan was blown across the table, the obstruction to the free air flow being roughly represented in the sketch:- FRONT ELEVATION SIDE ELEVATION PLAN ANEMOMETER The fan was driven by an electric motor of suitable power, electrically arranged in such a way that reasonably accurate measurements of power delivered from the motor pulley could be determined. (N.B. The principle of this power determination is that at each selected motor speed a constant field current is maintained and the motor armature volts and amperes observed both when driving the fan and when running light. From these figures the generated or back E.M.F. of the armature can be determined, and this, when multiplied by the armature current, gives the electrical power converted into mechanical power. Then the power of the motor running light can be | ||