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able aero-towing aerodrome aeroplane altimeter altitude auto-towing barograph began blind-flying British Gliding British Gliding Association bubble climbed cloud-base cloud-flying cockpit compass course cross-country flight cumulus clouds direction distance downcurrents Dunstable Dunstable Downs Elmira Eric Collins experience feet per second flew flown flying-speed front ft./sec gain height Germany Gliding Club goal-flight Gronhoff ground Grunau Baby Hanna Reitsch Heini Dittmar hill hill-soaring instruments Kronfeld land lenticular clouds lift London Gliding Club looked Ludwig Hofmann machine miles Minimoa minutes Moazagotl motorless flight mountains Musterle once parachute plane possible powered-sailplane pulled pure thermals pushed the stick rapidly reached release the cable Rhon Competitions rising Robert Kronfeld rudder sailplane pilots sinking-speed slope slope-soaring slope-wind soaring flight soon speed storm strong suddenly Sutton Bank take-off thermal flights thermal soaring thunderstorm flight tion towed turbulent turn-and-bank indicator upcurrents variometer Wasserkuppe weather winch-launch wind Wolf Hirth