Submersible aerial vehicle is capable of both flying in the air and submerging in the water. Advanced\nResearch Project Agency (DARPA) outlined a challenging set of requirements for a submersible aircraft and solicited\ninnovative research proposals on submersible aircraft since 2008. In this paper, a conceptual configuration design\nscheme of submersible unmanned aerial vehicle is proposed. This submersible UAV lands on the surface of water,\nthen adjusts its own density to entry water. On the contrary, it emerges from water by adjusting its own density and\nthen takes off from the surface of water. Wing of the UAV is whirling wing. It is set along aircraft�s fuselage while\nsubmerging for lift reduction. We analysis aerodynamic and hydrodynamic performance of this UAV by CFD method,\nespecially compare the hydrodynamic performance of the whirling wing configuration and normal configuration. It\nturns out that whirling wing is beneficial for submerging. This result proves that the configuration design scheme\nproposed in this paper is feasible and suitable for a submersible unmanned aerial vehicle.
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