Abstract: This invention provides a fire fighting Helicopter of the type which includes in the fuselage (2) tanks (3) filled with fire fighting fluid for putting out fires. The fire fighting Helicopter has a launcher for the fire fighting fluid under pressure and is found in the front lower part of the pilot's deck. The fire fighting Helicopter is also characterised for the fact that a plate (14) in the main tank of the fire fighting fluid is moving up and down vertically so that the fluid is kept stable between the main tank and the side walls of the main tank and in this way the centre of gravity is stable.