Modeling longitudinal aerodynamic and hydrodynamic effects of a flying boat in calm water

The researches of flying boats have been carried on for about a hundred years, and there are lots of flying boats used all around the world for different tasks. In this paper, the modeling of a flying boat´s longitudinal motion was researched. By analyzing the flying boat´s geometrical, kinematical and dynamical characters, its hydrodynamic coefficients were approximated by the semi-empirical method which came from Savitsky´s researching results of planing boats motion predication. Based on the form of the flying boat, some corrections to the Savitsky´s method were made to get a better approximation. The aerodynamic coefficients of the flying boat were obtained by some wind tunnel tests. Based on these results, the longitudinal nonlinear mathematical model of the flying boat in calm water was built. At last, a comparison of the taking-off process between the simulation results and existing experimental data was made. The results showed that the mathematical model was consistent with the actual flying boat.