Download Free Wind Tunnel Data On The Transonic Aerodynamic Characteristics Of Close Coupled Canards With Varying Planform Position And Deflection Relative To A 50 Degree Swept Wing Book in PDF and EPUB Free Download. You can read online Wind Tunnel Data On The Transonic Aerodynamic Characteristics Of Close Coupled Canards With Varying Planform Position And Deflection Relative To A 50 Degree Swept Wing and write the review.

The use of close-coupled canards to improve the flight characteristics of fighter and attack aircraft is currently being proposed. This report presents test data on the effect of such canards on a 25 deg leading edge sweep wing mounted low on a generalized body. The parameters investigated were canard deflection and position with the aircraft configured with and without a horizontal tail.
An analysis of the effects of canard shape, position, and deflection on the aerodynamic characteristics of two general research models having leading edge sweep angles of 25 and 50 degrees is presented. The analysis summarizes findings of three experimental transonic wind-tunnel programs and one supersonic wind-tunnel program conducted at this Center between 1970 and 1974. The analysis is based on four canard geometries varying in planform from a 60-degree delta to a 25-degree swept wing, high aspect ratio canard. The canards were tested at several positions and deflected from -10 to +10 degrees. In addition, configurations consisting of a horizontal tail and a canard with horizontal tails are analyzed. Results of the analysis indicate that the canard is effective in increasing lift and decreasing drag at Mach numbers from subsonic to high transonic speeds by delaying wing separation. The effectiveness of the canard is, however, decreased with increasing Mach number. At supersonic speeds the canard has little or no favorable effects on lift or drag. It is further shown that the horizontal tail is a superior trimming device than the close- coupled canard at low-to-moderate angles of attack and that a configuration consisting of canard, wing, and horizontal tail is superior in performance, to either canard or horizontal tail at high angles of attack.