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Old 07-05-2013
Brent Swain Brent Swain is offline
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Re: Is external rudder a good idea?

A friend said he heard that outboard rudders were more prone to failure, but only those on double enders. I notice that most double enders have the top pintle well below the rail, leaving the top portion of the rudder unsupported, and a bend and a long circuitous route from the top pintle to the end of the tiller.This could be the cause of the problem, as transom sterned boats dont have this problem, and have the top pintle at the top of the transom . It is yet another case of style over substance, easily rectified by putting a filler piece in, to straighten the stern, and put a top pintle at deck level in.
How would such a rudder with a deck level pintle be more vulenerable to damage than an expensive servo pendulum windvane hung on the transom? It seems such a rudder, with a trimtab self steering would be comparatively bulletporoof, and if the vane rig was built out of sch 40 SS pipe, it would be easier to straighten out if bent, anywhere, with no fancy tools. With the bottom of a rudder raked foreward ,it would be more inclined to pull water up it rather than pull air down it, altho anti cavitation plates at the surface ,similar to those used on outboard motors would be an option.
One could easily double the size of gudgeons and pintles with no penalty for doing so.
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Brent Swain, Boat designer, Builder, and author of "Origami Metal Boatbuilding"

Last edited by Brent Swain; 07-06-2013 at 08:30 PM.
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