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).
Engine overheating, discussing fan design, blade materials, and engine cowls.
| Identifier | ExFiles\Box 24\5\ Scan086 | |
| Date | 7th July 1925 | |
| R.R. 493a (50 M) (D.D. 91. 12-6-25) J.B.L. 4766 EXPERIMENTAL REPORT. Expl. No. REF: He1/AG17.7.25. To CJH from Hs.{Lord Ernest Hives - Chair} OVERHEATING. X766 X8220 X8250 With reference to the memo. from Lord Montagu. Our experiments have covered most of the points mentioned in this memo. As regards the design of the fan, apart from our own experiments carried out by EFC., we have also tested fans from other makes of car, we have also consulted Dr. Watts who is the leading man in the Country on Aeroplane Propeller design, and he has supplied us with designs for fans. The question of the fan design has been thoroughly gone into. In the case of the improvement which was gained by polishing the fan [REDACTED] blades. We should say the fans in this case were the usual cast aluminium type. We would expect then that the efficiency would be increased if they were polished, but in our case where we use sheet metal fans enamelled, these have a very smooth surface. The fans fitted to our cars are always the maximum diameter which can be fitted. With reference to the cowls on the engine side of the radiator. We have experimented with these. On our cars however there is not sufficient room to get in the best design of cowl. To do this it would mean increasing the length of the bonnet by several inches. Our tests with cowls show that the benefit from it would be very slight. We can appreciate that in the case of lorries, it would be more beneficial, contd :- | ||