Lateral stability and control characteristics of a free-flying model having an unswept wing with an aspect ratio of 2

Testshavebeenmadein theLangley free-flight tunnel to detemnine thelateral stabili@, control, andgeneral flying characteristics" of a free-flying modelhaving an unswept wingwithan aspect ratioof 2. The tests weremadeat a liftcoefficient of 1.0andcovered a rangeof geometric dihedral angles from+0° to 20°anda rangeofvertical-tail areasfkxnO to 15 percent of thewingarea.Theresults of thesetests werecompsred withthepreviously reported results of a similar series of testson a conventional mtielhaving a wingwithan aspect ratio Of 6.Thegeneral flight behaviwof thelow+spect+ratio mcxlel wasnot so goodas thatof theconventional modelforcorresponding values of static directional stabilimandeffective dihedral.Theprimary cause of thedifference in theflight behavior of themodels was theadverse yating moments dueto aileron deflection which, aswouldbe expected fromtheory, werecomiderably larger forthelow-aspect-ratio maiel thanfortheconventional model.. ..