http://oceanlines.biz/2008/11/paravanes-an-alternate-or-backup-stabilizing-system-for-trawlers/?utm_source=rss&utm_medium=rss&utm_campaign=paravanes-an-alternate-or-backup-stabilizing-system-for-trawlers Powerboat Cruising Sat, 18 Feb 2012 18:38:37 +0000 hourly 1 http://wordpress.org/?v=3.3.2 http://oceanlines.biz/2008/11/paravanes-an-alternate-or-backup-stabilizing-system-for-trawlers/comment-page-1/#comment-3967 Jon Lopez Wed, 15 Sep 2010 16:23:46 +0000 http://oceanlines.biz/?p=962#comment-3967 Tom, Thanks for the imput...I suspect you are right, but just as a devels advocate I have to ask: wouldn't the triangle formed by the mast and the staby boom function the same whether the horizontal leg of the triangle was formed by a single long boom from the mast to the point of attachment for the fish or by a shorter section of boom and the the rest of the ships structure? Seems like the line of force would ultimatly be transmitted to the center of boyancy, either way. Thanks for your help Tom,
Thanks for the imput…I suspect you are right, but just as a devels advocate I have to ask: wouldn’t the triangle formed by the mast and the staby boom function the same whether the horizontal leg of the triangle was formed by a single long boom from the mast to the point of attachment for the fish or by a shorter section of boom and the the rest of the ships structure? Seems like the line of force would ultimatly be transmitted to the center of boyancy, either way.
Thanks for your help

]]> http://oceanlines.biz/2008/11/paravanes-an-alternate-or-backup-stabilizing-system-for-trawlers/comment-page-1/#comment-3962 Editor Fri, 10 Sep 2010 20:07:18 +0000 http://oceanlines.biz/?p=962#comment-3962 If I remember my principles of the lever properly, (and there is no guarantee of that) then you want to righting force to act as far away from the centerline of the ship as possible in order to gain greatest effect. That increases the moment-arm and the force applied. Given that, you would NOT want the base of the arms to be amidships, since there would be little or no moment-arm to act as a lever. Let's see if we can get a naval architect to weigh in on this. After all, I am not a REAL naval architect, I only play one on TV (sorry, always wanted to say that). If I remember my principles of the lever properly, (and there is no guarantee of that) then you want to righting force to act as far away from the centerline of the ship as possible in order to gain greatest effect. That increases the moment-arm and the force applied. Given that, you would NOT want the base of the arms to be amidships, since there would be little or no moment-arm to act as a lever. Let’s see if we can get a naval architect to weigh in on this. After all, I am not a REAL naval architect, I only play one on TV (sorry, always wanted to say that).

]]> http://oceanlines.biz/2008/11/paravanes-an-alternate-or-backup-stabilizing-system-for-trawlers/comment-page-1/#comment-3961 Jon Lopez Fri, 10 Sep 2010 19:19:33 +0000 http://oceanlines.biz/?p=962#comment-3961 Tom,Thanks for your article on paravanes. Question: How critical is the inboard placement of the paravane boom? For example, could the swivel point be amidships instead of on the side of the hull? I am considering a design for a round hulled displacement trawler in which the in board end of two paravane booms would be placed nearly on the fore and aft center line at the base of the mast. The base fitting would be such that the booms could be swiveled 90 degrees aft and do double service as light cargo booms. Any thoughts? Tom,Thanks for your article on paravanes. Question: How critical is the inboard placement of the paravane boom? For example, could the swivel point be amidships instead of on the side of the hull? I am considering a design for a round hulled displacement trawler in which the in board end of two paravane booms would be placed nearly on the fore and aft center line at the base of the mast. The base fitting would be such that the booms could be swiveled 90 degrees aft and do double service as light cargo booms.
Any thoughts?

]]>