31. Pure sailplane , motorized self-launching and sustainer engine versions were announced. 32. Compared to airliners, sailplanes fly at low airspeeds. 33. In 1951, the prohibitions were lifted and the company returned to sailplane building. 34. Under his leadership the DFS continued to turn out a series of successful sailplanes . 35. The airport is mostly used for general aviation, and has extensive sailplane activity. 36. The term " sailplanes " is sometimes used. 37. The sailplane is trimmed in pitch via an innovative variable-position horizontal stabilizer. 38. The aircraft is a conventional self-launching sailplane , with a retractable engine. 39. It was flight tested by Jet-sailplane performer Bob Carlton in August 2011. 40. The first sailplane crossing of the Alps was flown by Heini Dittmar in 1936.
