This is a pretty cool creation. You can takeoff from the water or a runway. Detachers are:
1: detach fuel tank/barge.
2: enable air brakes.
3: detach wingtip pontoons/landing gear.
To take off from land:
Detach 1, slowly accelerate, do not use full power. climb up and retract gear. detach wingtips if desired (3)
From water:
retract gear, and you can accelerate with the orange pontoons attached. the throttle will automatically lower the water rudders. hold back elevator to avoid flipping.
You can detach the plane (1) and it will dive into the water and pop up behind the barge portion and shoot into the sky. If you detach the wingtips first (2) it will be launched forward and climb up.
You can also just detach the plane (1) right away and drive around on the water.