OK, that's how to flip on landing.
Now how do you flip one off a "standing start" (so to speak) when taking off?
Mike Ellis was watching the plane from shore and saw it start the attempted takeoff.
He said everything looked normal, but then "all of a sudden we see the right wing dip way down." Ellis said he then heard a loud bang, and the plane was suddenly upside down in the water.
Struck something with the starboard float?