Also common on trawlers. Actual trawlers not trawler yachts. About 8 to 10kts is the break even point, typically, and above that speed the increased drag results in a reduced efficiency. At normal trawling speeds they can save substantial fuel. Call it 3kts. if your E-boat will be cruising that slow then it might be worth considering. For a sailboat, forget it. Astern propulsion is noticeably weaker. Lateral thrust is of course reduced a great deal. Lots of tradeoffs including the actual cost of nozzle, and prop modification. When you get a net in the wheel it ain't nothing pretty. I have considered homebrewing one but I always ended up discarding the idea as having slightly more cons than pros. For a new build to be powered with electric drive, I might again give it some thought. It very likely wouldn't get past the thoughting stage, tho.
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