Airlander 10, the large, helium-filled plane/balloon/bum-shaped flying thing still hasn't left the ground since Hybrid Air Vehicles of the UK (HAV) bought it back from the US Military and reassembled it.
The cost of development was $USD 297 million when it was canned. HAV paid $301,000 for it (minus military hardware, software, and the helium)
The original version flew once, for 90 minutes, in August 2012. The makers are still claiming 90mph (148kph) maximum speed and up to five days aloft.
Sources:
http://www.bbc.com/news/uk-england-beds-bucks-herts-37086999
https://en.wikipedia.org/wiki/Hybrid_Air_Vehicles_HAV_304_Airlander_10
I still want a ride on it, if it ever flies.
(Score: 2) by butthurt on Tuesday August 16 2016, @11:26PM
The Titanic could float when its engines were turned off.
This aircraft is heavier than air. Unless its engines are running, it will sink to the ground. It would probably float on water, but the cabin would be submerged, I suppose.