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aero-towing aerofoil aeroplane aileron aircraft airflow allowed aspect ratio attached auto-towing bank bird flight bolts British Gliding Association cable central position centre certificate cloud construction control column control surfaces cord direction distance dope down-wind drag edge elastic elementary training elevator fabric face feet fitted fixed flanges flying force forward front fuselage glider gliding angle glue glued greater ground gussets hill horizontal incidence increased instructor joints Kassel landing launching length lift lift force loads longerons loss of height machine main plane method movement moving normal nose obtained pilot plywood possible pulley pupil release repair rope rudder bar sailing flight sailplane shock-cord side sideslip sideways skid slope soaring flight spar splice stall stick struts suitable SUTTON BANK tail plane thread towing trailing-edge turn turnbuckles up-current up-wind variometer velocity vertical welded whilst winch winch launching wind wing tip wing-loading wires