dec 31, 1938 - Helicopters
Description:
Igor Sikorsky is credited with invented the world’s first helicopter as we would recognise it. But the first record of a rotary winged craft dates back to the 4th Century in a book called “Pao Phu Tau” which describes a flying car kept in the air by spinning blades.Added to timeline:
Date:
dec 31, 1938
Now
~ 86 years ago