Grüne Post [SEP] named after
Grüne Post
The Grüne Post was a secondary trainer glider designed by Alexander Lippisch at the request of a German newspaper, the Grüne Post (), who distributed plans. Many were built by amateur groups.
Design and development.
In 1932 the Grüne Post, a popular German Sunday newspaper, approached Alexander Lippisch, a successful glider designer, for plans of a club glider that they would make available to their one million readers. The resulting simple single seat aircraft, named after the paper, was broadly similar to
a vacuum flask.
In 1926, the German newspaper "Grüne Post" offered a RM 5,000 prize for the first glider pilot to fly . Kronfeld took up the challenge in 1929 and selected a long chain of hills, the Teutoburger Wald, as a promising site for the record attempt.br 
He took off in a glider of his own design, named "Wien ("Vienna")", launched by bungee, near Ibbenbüren. After a flight lasting over five hours, he landed near Detmold, 102.5 km