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[PSUBS-MAILIST] concrete encasement for thruster



         Has anybody considered encasing a thruster motor in re-enforced concrete as a way of isolating the motor from the seawater and pressure?  If you could first seal all of the openings where you don't want cement with silicone or equivalent and then route your electrical wires thru an epoxy potted section I think it could work.  The motor shaft would have to be a good ceramic seal.
        Since the cement would be in contact with the motor housing you would probably get good heat transfer to the cold seawater also.    After the cement has cured coat it with an epoxy.
      If you had a malfunction, like a leak, or some other problem you could cut open the cement with a carbide blade, take the motor out, and then just pour a new concrete encasement  very cheaply. 
 
Brian Cox