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Skim MK1d (water plane demo)

Get it up to 100kph, and it'll take flight.. You'll want to back off the throttle a bit so it can level out, then you can give it to it, and fire up the secondary prop as well for a bit more speed.
Doesn't turn, at all. Wasn't a part of the test.

Hangs out 20m above sea level, which is just enough to clear the waves in even the worst storm.

If you strip the extra prop and motor from it, it should take flight at about 50kph, though you won't get the full 600kph out of it.