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23/07/03 14:51:33Login ] [ Contact Forum Admin ] [ Main index ] [ Post a new message ] [ Search | Check update time | Archives: 1[2]3456789 ]
Subject: Re: T500 Rudder


Author:
brian henry
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Date Posted: 7/05/06 20:41:55
In reply to: Graham Harrison 's message, "Re: T500 Rudder" on 7/05/06 15:38:15

Sure Graham, you can find it all on the C&C 27 Association web site at http://www.cc27association.com/index.html

But a summary is as follows, and forgive the history lesson if you already know of it, but the classic C&C 27 from 1970 went through four phases, or marks, of design when in 1974 the Mk III was introduced with a new rudder to cure the known problems of the original low aspect ratio rudder of Mks I and II, with a commensurate lengthening of the hull length aft to accommodate it. The length went from 27ft 4in to 27ft 11in (8.3m – 8.5m) because of it.

You can see the rudder differences here on the C&C 27 web site:
http://www.cc27association.com/guide/source/oldandnew.html

As we all know, the Trapper 500 was a licensed construction by Anstey Yachts in 1972 of the original C&C 27 Mk I with some minor improvements (including the keel shape) and so inherited the original rudder profile, later changed in 1981 with the Trapper 501 to the higher aspect ratio form with deeper draught to maintain the area.

Many C&C 27 owners recognised the improved handling characteristics of the Mk III rudder and have replaced their original scimitar-shaped rudders with something approximating the new form, although, of course, they didn’t have the extra hull length to keep it within the LOA as did the Mk III model.

The following page on the C&C 27 web site shows the modification:
http://www.cc27association.com/fixes/rudder/rudder.html

And here is one owner’s account of his step-by-step construction:
http://www.cc27association.com/fixes/newrudder/newrudder.html

Hope this helps.

Brian.

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Re: T500 Rudderbrian henry 8/05/06 10:16:39


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