Lift is a flight sandbox game. It is based on real world physics, but what you build is completely up to your imagination - from Superman to WWII bombers and everything in between. Compete against your friends in challenges, or play in sandbox mode where anything goes. Time manipulation and plane destruction features allow you to watch your beautiful creation crumble into dust frame by frame when you crash. Early alpha versions are free to play and will be released in Web, PC, and Linux form.
A collection of gifs and screenshots of user created planes.
Slow motion shot of a plane crashing. This plane was going about 250 m/s when this was captured.
Is that the BSG Colonial Viper?
Not sure, the person that made it just named it "SpaceShip". Definitely some similarities there.
There're also some clear differences, too, though, so I'd assume it isn't.
ANyway, this game looks phun. I'll have to try it.