zero sink

thermal cross country thermalling gaggle final glide wind vario contests speed to fly maccready landout sink sailplane racing water ballast lxnav parachute ground handling deviation center thermal flight instruction flight computer lift look outside outlanding rope break tost competition wave flarm checklists motorglider skysight convergence microburst far annual / yearly inspection spot tire landing seeyou aerotow contest strategy decision making turn area task start gate turnpoints stress faa buying a glider instruments