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RESEARCH ON A JET FLAP AIR-SEA CRAFT.
LOCKHEED-CALIFORNIA CO BURBANK
This report describes the pre-test analysis and the results of two wind tunnel investigations of a canard-configured, swept-wing model with jet flap systems incorporated in both the wing and the canard. For a jet flap airplane operating at trimmed lift coefficients of about CL 5, analysis indicates that the total blowing thrust demand for a canard-configured airplane is significantly less than that for a conventional aft-tail configuration. The canard-configured model appears to have satisfactory cruise characteristics, and there is little change in the static longitudinal stability on conversion to the STOL, jet flap blowing mode. Out-of-ground effect STOL characteristics are satisfactory at the low incidence proposed for operation at a certain higher critical incidence the wing stalls, and a pitch-up condition ensues. Ground proximity has little effect upon the operational values of lift, static margin, trim, etc., but it does seriously erode the margin between the operating and critical incidence. Possible operational techniques with this airplane configuration provide it with powerful and rapid response characteristics in lift and pitch control, this suggests that consideration should possibly be given to a change in emphasis in current precepts concerning what flying qualities are necessary and desirable for transitory STOL flight phases. Author