Aircraft for take off and landing on water and on land

1. An aircraft for takeoff and landing on water or land comprising

a fuselage;

a spring-mounted landing gear comprising two or more landing gear legs on which landing gear wheels for takeoff and landing on land are mountable; and

a single floating device coupled to the spring-mounted landing gear of the aircraft via a connecting device,

wherein the floating device is configured such that a hydrostatic lifting force of the floating device is greater than a maximum takeoff weight of the aircraft,

wherein the connecting device comprises a load-synchronization-kinematics, said load-synchronization-kinematics configured to distribute loads onto the two or more landing gear legs in a uniform manner, wherein the load-synchronization-kinematics comprises a synchronization lever to equally distribute a side load to the floating device to the two or more landing gear legs in a synchronized and damped way.

2. The aircraft according to claim 1 , wherein the connecting device comprises a distance setting device adapted to set a distance of at least a part of the floating device with respect to the fuselage.

3. The aircraft according to claim 2 , wherein the floating device is adapted to conform itself to the fuselage at least partly or at least substantially at a minimum distance set with the distance setting device.

4. The aircraft according to claim 1 , wherein the spring-mounted landing gear and/or the floating device comprises a damping element.

5. The aircraft according to claim 1 , wherein an inside of the floating device facing the fuselage comprises a substantially complementary shape to an undersides of the fuselage.

6. The aircraft according to claim 1 , wherein the floating device comprises a substantially streamlined shape with a step.

7. The aircraft according to claim 1 , wherein axes of the spring-mounted landing gear of the aircraft are coupleable to the floating device via the connecting device.

8. The aircraft according to claim 2 , wherein the distance setting device is configured to allow relative movements between the aircraft and the floating device at least in X and Y-directions.

9. The aircraft according to claim 1 , wherein the spring-mounted landing gear is connected with the floating device via hinged supports.

10. The aircraft according to claim 2 , wherein the distance setting device comprises a damping element, wherein the damping element is adapted to compensate the loads during takeoff and/or landing.

11. The aircraft according to claim 10 , wherein the damping element is configured such that the floating device can be moved along a longitudinal axis of the aircraft.

12. The aircraft according to claim 10 , wherein the damping element is configured such that the floating device can be moved along a transverse axis of the aircraft.

13. The aircraft according to claim 1 , wherein the floating device is equipped with the landing gear wheels for amphibious operation.

14. The aircraft according to claim 13 , wherein the floating device is coupled to the spring-mounted landing gear of the aircraft exclusively via the connecting device.

15. A method for converting an aircraft into a seaplane, wherein the method comprises:

coupling a single floating device to two or more landing gear legs of a landing gear of the aircraft via a connecting device;

adjusting a distance of least a part of the floating device with respect to a fuselage of the aircraft via a distance setting device of the connecting device; and

connecting a load-synchronization-kinematics comprised in the connecting device with the two or more landing gear legs to distribute the loads onto the one or more landing gear legs in a uniform manner, wherein the load-synchronization-kinematics comprises a synchronization lever to equally distribute a side load to the floating device to the two or more landing gear legs in a synchronized and damped way.

16. The method according to claim 15 , further comprising an adjustment of the distance so that the floating device conforms itself at least partly to the fuselage or conforms itself at least substantially to the fuselage of the aircraft.

17. The aircraft according to claim 1 , wherein the floating device and the spring-mounted landing gear are used for takeoff and landing of the aircraft on water and/or on land.

18. The method of claim 15 , further comprising using the floating device and the landing gear for takeoff and landing of the aircraft on water and/or on land.

19. The aircraft of claim 4 , wherein the damping element comprises one or more of a suspension element, a buffer element, a shock absorber, a gas spring, a hydraulic cylinder, or a hydropneumatic cylinder.