Subject: [harryproa] Re: Simpleminded rudder design
From: "jjtctaylor" <>
Date: 5/30/2008, 9:28 PM

Hi Gardner,

That's essentially the plan as it is currently devised. The only difference is there is no
pivot pin. Only two pins, one shears or the other, and the rudder pivots on the surviving
pin. The pins themselves don't shear, only a retaining plate securing the pins shear. Can
have a stack of plates and easy to reinstall.

Your design could work too. You only have half the problem solved. What happens to the
steering connection when the pin shears ? That's significantly more complication. Rob's
design the rudder always falls away from the axis where your pivot pin is located. That is
where the connection to steer is made, either rack and pinion for him or spur gear and
worm drive for me.

In your design the pivot pin would have to move forward to allow the rudder swing to clear
the enagagement depth of the mating steering hardware.

Doesn't mean it can't be done, just have to be sure your design is better than something
else. So far none have offered significant advantages. If you have some ideas on steering
connection, please add to your model. Not want to stifle creativity.


--- In, "gardnerpomper" <gardner@...> wrote:
> Hi,
> There have been alot of rudder discussions here and I have not gotten them clear in my
> I just posted to Files, under "Gardners layous" a rudder PDF file. It seems like this would
> for the lifting, tilt when grounding and 306 degree coverage. It is so simple, that I am
> everyone can tell me why it doesn't work. Can someone use this as a basis to let me
> how the Harryproa rudders (specifically for the charter proa) differ?
> In case my drawing is less that clear, the idea is that there is a short section of rudder
> (allowing the rudder to lift vertically), enclosed in a nylon bearing (allowing 360 degree
> rotation) that acts like both a bearing and a quadrant. The outside (non-turning part) of
> bearing has a center rotational pin and 2 sacrificial pins that will break in the event of a
> grounding and allow the rudder to kick up.
> Thanks,
> - Gardner

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