The drag of closed-cockpit and transport-type windshields was determined from tests made at speeds from 200 to 440 miles per hour in the NACA 8-foot high-speed wind tunnel. This speed range corresponds to a test Reynolds number range of 2,510,000 to 4,830,000 based on the mean aerodynamic chord of the full-span model (17.29 inches). The shapes of the windshield proper, the hood, and the tail fairing were systematically varied to include common types and a refined design. Transport types varied from a reproduction of a current type to a completely faired windshield. The results show that the drag of windshields of the same frontal area, on airplanes of small to medium size, may account for 15% of the airplane drag or may be reduced to 1%. Optimum values are given for windshield and tail-fairing lengths; the effect, at various radii is shown. The longitudinal profile of a windshield is shown to be most important and the transverse profile, to be much less important. The effects of retaining strips, of steps for telescoping hoods, and of recessed windows are determined. The results show that the drag of transport-type windshields may account for 21% of the fuselage drag or may be reduced to 2%.


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    Title :

    An Investigation of the Drag of Windshields in the 8-Foot High-Speed Wind Tunnel


    Contributors:

    Publication date :

    1939-06-01


    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English




    Investigation of drag of windshields in 8-foot high-speed wind tunnel

    Robinson, R.G. / Delang, J.B. | Engineering Index Backfile | 1942




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    Warner, Edward P. | SLUB | 1925


    Wind tunnel tests of fuselages and windshields

    Warner, E.P. | Engineering Index Backfile | 1925