I think having a cassette for an
emergency rudder installed prior to a long voyage is a very good idea. That is what I will do for my
boat. I think it is better to have a fixed gudgeon bracket (to hold the
emergency rudder) already installed on the
boat along with the pintles already in a kit (with bolts and other needed bits). Heavy
weather makes use of anything difficult on a boat, so I would prefer to have some of the key
parts already installed, securely fitted, and ready to use in minimal time.
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Some of the
wind vane manufacturer's have some proposed uses of their vanes or add on features (e.g.
Monitor has an optional add on emergency
rudder kit).
http://www.selfsteer.com/products/monitor/mrud.php
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The Singlehanded Sailing Society in
San Francisco has a website with many different resources available (articles, tips, etc.). This page has links to a lot of information that singlehanded (or short handed) cruisers may find interesting (I did).
Resources | Singlehanded Sailing Society
One document is an illustrated 2014 presentation with lots of technical specs on how Autopilots
work and typical causes of failure. I found this interesting to read, and while it is not directly related to emergency rudders, I think some of the info is worth seeing.
http://sfbaysss.net/resource/doc/SSS...lot_011314.pdf
Another document that features some illustrations and technical discussion of a few types of possible emergency rudders or
steering.
http://sfbaysss.net/resource/doc/rud...compendium.pdf
And there is even a paper on using a "soft rudder" (made of sailcloth) that can be made and used in an emergency.
http://sfbaysss.net/resource/doc/kam...ncy-rudder.pdf