<<I appreciate your damping of the almost acrimonious debate. I
am after reasoned engineering for criticism so I can learn and tend to
get impatient with liturgy.>>
No problem. Sometimes I think I'm being too wishy-washy, but I give
it a shot anyway.
I don't blame you for getting impatient. I'm disappointed in the
lack of thought some gave to the Jordan site, particularly the report.
I'm all for criticizing ideas after one has attempted to understand
them, but a number of folks clearly didn't bother to think or read
Sometimes, as with the rig discussions, I'm amazed at how tightly
people cling to their preconceived notions, not even absorbing the
other sides to the discussion. And this is supposed to be a forum
about an innovative boat that breaks the rules of status quo. Odd.
i agree with you on the drogue system. Redundant, mechanisms, ease
of deployment (just pay it out), better continuous loading, lower
maximum loading, quicker response to breaking waves, less likely to
foul. They make it hard to argue for a single large para anchor. I've
never set one myself, but I've read many stories about people who have
botched their deployment during really bad weather.
The only thing I question is the ability to adjust the loading by
varying the amount of the drogue line paid out. Everything I see on
the Jordan site shows a fixed bridle going out to lines that then
attach to the drogues.
Your repeated posts over time are slowly infecting me with the wharram
rig. My ideal rig would be a reef-able dynarig, but the dynarig
folks are hard to find these days, and I'm not sure if they ever solved
the reefing problem.
While I'd hate to give up my pretty golden mylar Pentex
sails, I'll admit that this is somewhat of a shallow desire. With the
strengths of the wharram rig, it's possible that the
stiffness and high modulus of Pentex aren't important.
The additional area aloft, and the shaping from the gaff, combined with
the smooth leading edge, could make up for the soft sailcloth.
I wish it were possible to test a wharram rig versus an
equivalent una rig, and then look at the costs.
I'll post the wharram thing sometime in the next few
months (after the trailerable issue). I just want to wait until I'm
quiet for a little while, and also until I've finished reading all the
past postings. I'm slowly getting there.
rob dalton wrote:
I started to realise what I had been doing after an excessive
number of memorial services and that three of the boats I had worked on
were on the bottom. It started m ehtinking seriously about safety at
sea from an engineering perspective.
To me the series system with continuous loading along the line
should give better surge characteristics , be less susceptible to
wrapping itself round bits and pieces- as happenned to that bloke
trying to kite his way across an ocean, failure of an element is not
catastrophic, easier to launch
I think I have come to the conclusion that most modern sailing
boats should be attached at the bow if current is their main concern
and by the stern if wind is the problem. For a Harry this is not a
problem. The long, low rocker hulls means that the boats will respond
to the pressure on the bow from the rode, due to oscillating
winds, with a damped motion.
I appreciate your damping of the almost acrimonious debate. I am
after reasoned engineering for criticism so I can learn and tend to get
impatient with liturgy.
have been one of those fishermen who have fished in the Tasman
sea for a living>>
Well then, my hat is off to you. :-)
I also really like the theory of paying out more or less of the
drogue line depending upon how much you want to slow your progress.
like about the combination of a Harry and a jordan series
drogue is that if you want to slow the boat to almost a stop, ie a
para anchor, then you merely pay out more elements to you get to the
same total area of the equivalent para chute anchor.
There has been derision about anchoring from the stern without a
solid explanation why. On some boats it is quite successful and much
more comfortable in that it reduces yawing.
(I have been one of those fishermen who have fished in the Tasman sea
for a living)
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