I think what they mean Chuck is a motor from a servo.
If you have a look at my Revel U-Boat R/C conversion I used two servo motors to propel that.
Looking at your model I don't think it is too big for a similar set up. I purchased my propulsion gear from SHG, if you want any further details I will find them for you. They supplied my motors, couplings, shafts, tubes and props and they did the job very nicely on the U-Boat.
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