PMMA AIRCRAFT WINDOW(1935)

摘要

The availability of lightweight plastics glazing materials for aircraft windows is something we take for granted today,but back in the early days of flight the options were much more restricted.That changed in 1935,when Boeing's prototype B-17 Flying Fortress took to the skies,equipped with its distinctive flat-panelled nose made from sheets of the then new polymethylmethacrylate(PMMA)resin.