When I'm in the payware Twin Otter with floats while in the water it doesn't move with full throttle. Everything else is working and I can even hear the engines revving up but it just sits there. My

default planes with floats do take off.

...sounds like the start locks not removed - consult the manual..

 

Quote:

 

FLOAT PLANE WITH START LOCKS
The start locks will prevent the floater aircraft moving when the engines are started.

 

START UP
 Power levers at idle
 Propeller levers full forward
 Starter engage
 Fuel lever On above 12% Ng
Engine will start with start locks engaged, thus locks in 0°. This will also be indicated by the Beta range lights being lit. Increasing the power levers will not produce any forward thrust, thus no or little torque. Since the start locks keeps the prop pitch at or below 0° You need to move the power into reverse range which actually still is forward thrust 12 -> 0° (Reverse is 0 -> ÷15°)

 

DISENGAGE THE START LOCKS
 Power levers retard into beta range until torque increases
 Power levers back to idle, Start locks has been disengaged when the beta range lights are unlit.

 

Hint: Try hitting F2 a couple of times..

It worked. Thank's Bert, you're a life saver.