Helicopter Evolution

https://aerospace.honeywell.com/blog/of-whirlybirds%2C-hums-and-flying-bananas

#throwbackThursday to last week’s World Helicopter Day! #tbt http://t.co/4beJasKJm1 pic.twitter.com/pfTNNpm8bV

— Honeywell Aerospace (@Honeywell_Aero) August 20, 2015