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).
Comparative test measuring the velocity of air passing through the radiator on the 40/50 and the Goshawk II models.
| Identifier | ExFiles\Box 180\M2\M2.4\ img032 | |
| Date | 30th May 1922 | |
| To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c.c. to CJ. c.c. to E.{Mr Elliott - Chief Engineer} c.c. to Da.{Bernard Day - Chassis Design} c.c. to By.{R.W. Bailey - Chief Engineer} c.c. to Fp.{F. Potts} c.c. to Hy.{Tom Haldenby - Plant Engineer} (Laval). ORIGINAL RE GOSHAWK II. COOLING Y1751 X3005 X1001 X3101 X2660 Y2200 Y4001 (X231) We have made a comparative test measuring the velocity of air passing through the radiator on the 40/50 and the Goshawk. We measured the air by means of a rotary wind gauge. We took three readings in different positions on the radiator at each speed. The fan belts were tightened up in each case. The bonnet and the usual cowling was fitted. Comparison of speed of air passing through radiator tubes. Engine revs. | 40/50. | Goshawk II. 1000 | 1190 ft. per min. | 560 ft. per min. 1500 | 1570 | 993 2000 | 1500 | 1320 It will be seen that at low speeds the 40/50 fan is considerably more efficient than Goshawk II, but at high speeds the difference is not so marked. This we suggest is due to the air not being able to get away sufficiently freely on the 40/50 which causes a considerable back pressure under the bonnet. Undoubtedly the first thing to tackle is to make the fan on the Goshawk relatively as efficient as the one we use on the 40/50. In connection with the airships, a considerable amount of work was done on fans. We tried a number of | ||