Hi All, Rob, Mark especially
I
just remembered that my first correspondence with Rob had to do with rudder
design. His early plans for Harry had two side-hung rudders in cases that
pivoted vertically on their bottom corners with their top corners held in place
in/on a semi-circular slot or track in the hull. My original note asked which
was intended since the sketches were, well, sketchy.
Mark's comments made me think that perhaps
that old idea might be worthy of
reconsideration. I just added an old sketch I sent to
Rob at the time to the Files section of Harryproa group (labelled Rudder,
naturally). The idea is that the rudder is free to pivot around the stock as one
would imagine but the entire stock assembly would pivot on a pin through the
hull and its angle could be determined by yet another line to a car or flange
riding on a semi-circular section of track bonded to the hull. That line, in
turn, could be fixed via a clutch or jam cleat which could be rigged to slip
under a strong enough load. Resetting after an "incident" could be quick and
easy.
This strikes me as too good
to be true, so could the engineers in the group please tell me what I've
missed?
Enjoy
Jim
Baltaxe
They said, get a life. I looked on TradeMe but I couldn't find
one.
From: harryproa@yahoogrou
Sent: Tuesday, 15 January 2008 11:20 p.m.
To: harryproa@yahoogrou
Subject: Re: [harryproa] Re: Anyone there ?
The biggest negative about the hull hung rudders, well the mk 2 version, is they would be difficult to replace once the shear pins broke. At the moment they are designed to 'break away' in the event of a collision. You would then have to retrieve them from the end of the attachment line and refit them with new shear pins. This may seem like a big disadvantage but it will only happen in a catastrophic event which would render any catamaran with a stuck and broken daggerboard at best and a split hull and bent rudder shaft at worst.
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