Test of 10-foot diameter, four and six blade single-rotating and dual-rotating propellers were conducted in the NACA propeller-research tunnel. The propellers were mounted at the front end of a streamline body incorporating spinners to house the hub portions. The effect of a symmetrical wing mounted in the slipstream ranged from 20 degrees to 65 degrees setting corresponds to airplane speeds greater than 500 miles per hour. The results indicate that dual-rotating propellers were from 0 to 6 percent more efficient than single-rotating ones; but, when the propellers operated in the presence of a wing, the gain was reduced by about one-half. Other advantages of dual-rotating propellers were found to include greater power absorption and greater efficiency at the low V/nD operating range of high-pitch propellers.


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    Titel :

    Wind-Tunnel Tests of Four- and Six-Blade Single- and Dual-Rotating Tractor Propellers


    Beteiligte:

    Erscheinungsdatum :

    01.01.1942


    Medientyp :

    Sonstige


    Format :

    Keine Angabe


    Sprache :

    Englisch



    Wind-tunnel tests of four- and six-blade single- and dual-rotating tractor propellers

    Biermann, D. / Hartman, E.P. | Engineering Index Backfile | 1942


    Wind-tunnel tests of eight-blade single- and dual-rotating propellers in tractor position

    Biermann, D. / Gray, W.H. | Engineering Index Backfile | 1941


    Wind-tunnel tests of single- and dual-rotating tractor propellers of large blade width

    Biermann, David / Gray, W. H. / Maynard, Julian D. | TIBKAT | 1942



    Wind-tunnel tests of single and dual-rotating tractor propellers of large blade width

    Biermann, D. / Gray, W.H. / Maynard, J.D. | Engineering Index Backfile | 1942