This report describes a second method of designing airscrew type fans with straighteners. The first method of design aimed particularly at obtaining a high efficiency and it was assumed that all other design factors could be chosen to suit this main condition. In practice, however, some of these factors are frequently fixed by other considerations and the problem then becomes that of determining a design which will give good efficiency under those conditions. It was considered necessary, therefore, to develop a second method of design which would be more direct in practical cases of this type.
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