advanced high altitude training glider based on the Gld.1 Trainer. - this model is an advanced high altitude flight training version of the Gld.1 - easy construction and good flight abilities with good speed didn t changed very much. still with the long wings the plane wont fall in Stalls even by doing acrobations . by tests ive fown on alt. nearly 34000ft. i dont know if this is the max altitude but on this altitude stabile flight abilities are weakened and the plane will go off course very often. even by some construction changes the mass of the plane didnt changed very much. to all users-- i would like to remind that for easier flight with a glider everyone can save a position everywhere on the map . if you do this nearly an airport on altitude over 4000ft you can easy start from that air point for soaring flight training with any kind of gliders.