![\"Norwegian-Ship-Design-106\"](\"https:\/\/setsail.com\/wp-content\/uploads\/2009\/05\/norwegian-ship-design-106.jpg\")
<\/p>\n<\/p>\n
We’ve been fascinated by prop shrouds and articulating rudders for years, so when we passed this trawler in dry dock we could not help but take photos.<\/p>\n
Lars Bergstrom used articulated rudders on many of his sailing designs to great effect. Rather than being a means of enhancing lift, he used tiny trailing edge flaps with which the skipper controlled the rudder (in the same fashion that airliner rudders are controlled). Whether with auto pilot or tiller, this is the most efficient means of adjusting rudder angle of attack – at some cost in complication.<\/p>\n
The rudder above is flapped for a different reason.<\/p>\n
<\/p>\n
This is to increase lift on the rudder and do a better job directing the propeller thrust. These are seen with some frequency on commercial vessels which require good maneuverability.<\/p>\n
Of course, if you have the space the simplest answer is a bigger rudder, which in the end, has always been our answer.<\/p>\n
The prop shroud is to keep nets clear of entanglement with the propeller. Some vessels which operate in ice have these as well, often with forward struts for additional support and to keep ice from jamming into the prop\/shroud interface.<\/p>\n","protected":false},"excerpt":{"rendered":"