Wow, What a project. If the motor end is watertight then it is airtight as well? I like the retractable drive concept. I manufactured submersible hydraulic systems for deep-sea construction. The electric power was a modified AC motor encased inside of an SS capsule. The cooling effect of beinf submerged allowed for very excessive over powering of the motor without over heating. The capsule was filled with a refrigeration oil used in sealed refrigeration systems. Yes, the oil does warm up while the motor is under a load. I used an air spring bladder as an accumulator that was caged so that a spring could preload the pressure and still allow for some expansion of the heated oil and then retract with a positive pressure when oil was cooling so there was never any negative pressure inside of the capsule. The motor drove a hydraulic pump that was also inside of the capsule with just a pressure outlet to the hydraulic tools and a low-pressure return inlet back to a reservoir and then back to the pump. You would need to think about using a brushless motor. Carbon brushes cast off carbon as they age which contaminates the oil. I guess the point is that sealing a motor for submersed use is pretty straight forward and does have the benefit of running a cool motor as well as beating the normal destruction of sea air and water and wet bilges. Electric boats are almost a cool as sailboats and then all in sleek composite Multihull. You got going for you man.
another Rob
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