This is the Bronco Type XXIII U-Boat in a massive 1/35 scale. The boat I depicted, U-2336, sank the last two merchant ships by submarine in WWII. To depict her I had to add more scuppers to the conning tower and scratchbuilt the snorkel; otherwise it was a straightforward build.
There appear to be steering-boards on both sides. Are these to help control the drift? And what about the spiked bow? This is a beautiful model of a very interesting vessel.
These are Portuguese fishing boats. My understanding is that they used bottom trawls, dragged to windward as the boat drifted to leeward. The strange suit of sails could be adjusted to control the direction of drift relative to the wind.