Tests of 10-ft. diameter, eight-blade, single - and dual - rotating propellers were conducted in 20-ft propeller research tunnel. Propellers were mounted at front end of a streamline body in spinners that covered hubs and parts of shanks. Effect of a symmetrical wing mounted in slipstream was investigated. Blade-angle settings ranged from 20 Degrees to 65 Degrees. Results indicated that dual rotation resulted in gains of from 1 to 8 percent in efficiency over single rotation for eight-blade propellers, but presence of a wing reduced gain about one-half. Greater power absorption caused by dual rotation over flight range and higher efficiency or thrust for range of take-off and climb was indicated


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    Title :

    Wind-tunnel Tests of Eight-blade Single and Dual-rotating Propellers in the Tractor Position


    Contributors:

    Publication date :

    1941-11-01


    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English