{"id":990,"date":"1999-11-30T00:00:00","date_gmt":"1999-11-30T05:00:00","guid":{"rendered":"https:\/\/setsail.com\/?p=990"},"modified":"2015-10-16T12:09:43","modified_gmt":"2015-10-16T17:09:43","slug":"stern-tubes-in-steel-boats","status":"publish","type":"post","link":"https:\/\/setsail.com\/stern-tubes-in-steel-boats\/","title":{"rendered":"Stern Tubes in Steel Boats"},"content":{"rendered":"<div class=\"question\">\n<p class=\"Body\">Dear Steve &#038; Linda: Received your Offshore Cruising Encyclopedia Second Edition for Christmas 97 and I cannot stop reading it. I am at present building a 45ft steel motorsailor from a kit. The design includes welding a steel tube into the hull for the propeller shaft stern gear. As this tube is bored each end to accept the cutlass bearings and salt water is pumped through to lubricate these bearings, I am concerned about rusting of the inside of the tube and the corrosion around the cutlass bearing making for difficulty in removing for replacement bearing. Is it possible to manufacture the stern tube from stainless steel and weld the stainless to the steel hull? This would give the protection from corrosion. If it is (possible), what would be the ideal grade stainless steel? The propellor shaft is 316 grade. Regards, Dave <\/p>\n<\/div>\n<p><!--more--><\/p>\n<div class=\"answer\">\n<p class=\"Body\">Hi Dave: I have no direct experience with steel construction, so I am probably the wrong person to ask. However, I don&#8217;t think 316 SS would be good for a stern tube. It is actually not very good at corrosion resistance. Using properly painted steel, the same as the hull, is actually quite common for stern tubes and throughhulls. If you wanted to to get fancy you could look into Corten steel or something along the lines of Nitronic alloys. However, you&#8217;d have to check out the corrosion issues with the weld itself. The main thing with any of this is to have enough thickness in the stern tube to allow for some corrosion, and a good paint system. Good luck! <\/p>\n<p class=\"Body\" align=\"center\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Dear Steve &#038; Linda: Received your Offshore Cruising Encyclopedia Second Edition for Christmas 97 and I cannot stop reading it. <a class=\"read-more\" href=\"https:\/\/setsail.com\/stern-tubes-in-steel-boats\/\">&#8230;Read More<\/a><\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17,10],"tags":[],"class_list":["post-990","post","type-post","status-publish","format-standard","hentry","category-yacht-construction-forum","category-tech-talk"],"_links":{"self":[{"href":"https:\/\/setsail.com\/wp-json\/wp\/v2\/posts\/990"}],"collection":[{"href":"https:\/\/setsail.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/setsail.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/setsail.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/setsail.com\/wp-json\/wp\/v2\/comments?post=990"}],"version-history":[{"count":1,"href":"https:\/\/setsail.com\/wp-json\/wp\/v2\/posts\/990\/revisions"}],"predecessor-version":[{"id":36215,"href":"https:\/\/setsail.com\/wp-json\/wp\/v2\/posts\/990\/revisions\/36215"}],"wp:attachment":[{"href":"https:\/\/setsail.com\/wp-json\/wp\/v2\/media?parent=990"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/setsail.com\/wp-json\/wp\/v2\/categories?post=990"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/setsail.com\/wp-json\/wp\/v2\/tags?post=990"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}