https://edition.cnn.com/travel/article/ ... index.html
"While it will reach a maximum speed of about 280 mph at this height, the glider's airspeed indicator will only indicate 36 knots (about 41 mph) due to the very thin air at this elevation."
http://www.perlanproject.org/
Per essere trainati oltre i 40.000 piedi serve un traino d'eccezione
https://en.wikipedia.org/wiki/Grob_G_520
I piloti degli U2 devono cominciare a stare attenti al traffico
