Porpoising instability study of the floatplane during take off operation on calm water

Abstract Floatplane is a type of airplane that can take-off and land on the surface water, for it equipped with float installed under fuselage to serve buoyancy force. An important phenomenon often occurs should be avoided during operation porpoising because causes longitudinal instability which has an impact passenger safety comfort. This paper describes mechanism variables influence occurrence this phenomenon. The most dominant include location center gravity (LCG) deadrise angle are optimized by considering speed. A numerical arrangement based computational fluid dynamics (CFD) techniques proposed simulate three-dimensional flow around free-floating in calm water. accuracy simulation results shows good fit compared previously published experimental results.