The Trials of the Doak

Only one Doak VZ-4 was built, partly cobbled together using parts from other types. The U.S. Army, the project sponsor, eventually decided to stick with helicopters, and put the Doak in a museum at Ft. Eustis, Virginia. (Video: U.S. Army) (0:35)

Latest Videos

Preview thumbnail for video'What a sunset on Earth looks like from the moon
What a sunset on Earth looks like from the moon (2:23)
Preview thumbnail for video'Why Wales is the place to see amazing Roman forts
Why Wales is the place to see amazing Roman forts (1:49)
Preview thumbnail for video'The only way to really understand a hovercraft is to drive one
The only way to really understand a hovercraft is to drive one (3:15)
Preview thumbnail for video'Take a look inside one of the most unusual vehicles ever
Take a look inside one of the most unusual vehicles ever (2:43)
Preview thumbnail for video'The Brains behind Star Trek
The Brains behind Star Trek (2:34)
Preview thumbnail for video'The Honorable Tradition in Arlington National Cemetery
The Honorable Tradition in Arlington National Cemetery (1:53)
Preview thumbnail for video'The Astronauts' Story, Ron Howard's Apollo 13
The Astronauts' Story, Ron Howard's Apollo 13 (2:08)
Preview thumbnail for video'Surviving a Plane Crash in the Swiss Alps
Surviving a Plane Crash in the Swiss Alps (2:39)
Preview thumbnail for video'Scientists reveal first-ever photograph of a Black Hole
Scientists reveal first-ever photograph of a Black Hole (3:01)