This is a Sea Plane.
It will take off from the water almost as easily as it does from land, which is extremely easily.
On land, throttle up to 20% and once it hits around 100 mph it gets airborne.
It will eventually start heading downward, slowly.
For water take off, full trim and throttle up making sure to go neutral once airborne.

This aircraft is fully aerobatic oddly enough, rolls slowly but evenly, but there is a mystery I can not quite figure out when it comes to loops.

Partway through a loop it is like the ailerons and the flaps seem to start working against each other, making it fly straight in what ever attitude it is in at the time, followed by a series of random rolls in either direction.

Once it stops being random, it goes back to being a 'normal' aircraft, climbing like it has rockets and so on, just do not try to loop it too low, go '3 mistakes high' before trying it as my Father would say.

It has something to do with the flaps on the tail I think, I've had a similar problem before and solved it by making them smaller, but going much smaller than they are now they may as well not be there at all.

This was literally put together in a bit over an hour with some time 'trimming & problem solving' thrown in.

I was going to make it prettier, but ran into that problem talked about earlier.

The only XML involved is the fuel tank (more fuel, zero mass, zero drag) and the Cockpit area (2 cockpits, edited for size).