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One of the effective ways to increase the speed of amphibious vehicle is to reduce the overall resistance. In order to research the influence of trim angle on the resistance characteristics, a numerical calculation method is used to research the resistance characteristics of high speed wheeled amphibious vehicle. The numerical results are in good agreement with the experimental results. The research results show that the resistance increases with the increase in speed when the vehicle trim angle is small; it increases first and then tends to be stable with the increase in speed when the vehicle trim angle is bigger. When the speed is low, the trim angle has a small influence on longitudinal resistance ; when the speed is higher, the resistance decreases first and then increases with the increase in trim angle. As speed increases, the vehicle trim angle becomes smaller, but the resistance increases. [ABSTRACT FROM AUTHOR]

A drop test rig is developed for landing gears of Seagull 300 light multi-functional amphibious airplane based on its drop-test specifications. Several key technologies are studied including the wheel's turning speed, sliding with low friction, and design of impact platform and simulation of runway. According to the requirement of CCAR-23-R3, drop tests of Seagull 300 airplane are finished such as adjusting parameters for test, limited drop test and the reserve energy absorption drop test of nose landing gear. The test results show that the test system is secure and reliable, the limit load is lower than the design one and the landing gear can bear the reserve energy absorption drop. The test system can be applied for drop-test of other light airplane. Moreover, the test results can be used as the certification of the airworthiness for this airplane. [ABSTRACT FROM AUTHOR]