Quote:
Originally Posted by Phil Fill
...I count para vanes as active as you have to physical active/deploy them. Also they do not change the stability of the boat, but make the ride better/easier. Where as passive they do not to be activated deployed and they tend to change the stability of the boat. But that is another discussion.
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Read Voyaging Under Power by Robert Beebe particularly Chapter 6, Stabilizing Against Rolling. The chapter gets into a good discussion on passive devices such as paravanes, bilge keels, steading sails and few others and talks about active devices which include "activated fins'. The chapter also has the stress analysis for paravanes of a 36' trawler yacht.