Helicopters come in all sorts of weird shapes and sizes. In the early days of mass-produced helicopters in the 1940s and 1950s, engineers experimented with strange designs and unique concepts, many of ...

Add Yahoo as a preferred source to see more of our stories on Google. 0 18 rah 66 comanche prototype US Army Like cursed penguins, a whole barrage of helicopter designs has failed to make it. From ...