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Aquatic–aerial unmanned vehicles recently became the focus of many researchers due to their various possible applications. Achieving a fully operational vehicle that is capable of aerial, water‐surface, and underwater operations is a significant challenge considering the vehicle's air–water–air transition, propulsion system, and stability underwater. We present in this paper an unconventional unmanned...
This paper presents a preliminary feasibility study of using aerial, fixed-pitch propellers, underwater. Tests were performs in both air and in water using a test stand that was designed to study the efficiency of commercially available, counter-rotating, multirotor propellers. Experimental results showed that the propellers can operate ably underwater in terms of thrust to power ratio at low rotational...
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