Around the world nonstop, was Trawler yachts across the Southern Ocean
A nonstop circumnavigation would mean rounding via the capes, not the
canals, thus, the need to venture into the Southern Ocean.
You had better get a Jordan Series Drogue.
All reports indicate the Jordan is a most effective device for
serious heavy weather:
http://www.jordanseriesdrogue.com/
http://www.cruisinghome.com/Pages/jordan.htm
http://www.setsail.com/s_logs/bannerot/bannerot4.html
Sure would like to find someone who has actually deployed one on a powerboat.
--Georgs
RE: Sure would like to find someone who has actually deployed one (Drogue)
on a powerboat.
If I understand the Drogue web site correctly the Drogue is intended to
reduce your speed through the water and keep the boat from broaching. This
may be useful in some power boats that have a severe tendency to broach in
moderate trailing seas but I would not choose to be stern to any really
heavy weather if I had a choice.
I carry a ParaTech sea anchor on our trawler and a rode and harness that
will allow the boat to lay bow 1/4 to the storm, which I find to be a more
storm resistant attitude for severe weather. In addition, a sea anchor
serves as a safety device for A) a tired or injured crew, B) failure of
major equipment (including engines, navigation or other equipment) where
standing nearly still (~1/2 knot) and safe even in severe weather may be the
best option, at least for a while.
Other thoughts ??
Regards, John Harris
"World Odd @ Sea"
At 09:14 AM 12/31/04 -0700, you wrote:
If I understand the Drogue web site correctly the Drogue is intended to
reduce your speed through the water and keep the boat from broaching. This
may be useful in some power boats that have a severe tendency to broach in
moderate trailing seas but I would not choose to be stern to any really
heavy weather if I had a choice.
If you have these or similar notions about drogues and parachute anchors
then you should read the CG report on this subject. A careful read of it
may convince you as it has me that most of us are operating under some
dangerous misconceptions. THe USCG report CG-D-20-87.
A few items for your consideration.
- That being hit from the stern is more of a danger than being rolled or
pitchpoled? - That being rolled or pitchpoled is more likely than is generally
understood, under severe conditions! - That Traditional methods of preventing #2 suffer from 3 major weakness.
That a single point drogue is not stable enough, that if sufficiently
strong to prevent #2, that it may not be possible to attach such that it
will not part from the boat in an ultimate strike. That in order to impart
enough give to prevent the instantaneous loads from exceeding the breaking
strength, the rode will not be stiff enough(fast enought) to prevent the
broach or pitchpole, period. - That few modern vessels will lie near enough to the waves if bow on,
coupled with the lack of buoyancy at the bow makes the bow a poor choice to
lie in the ultimate storm. Given that many boats will require reinforcing
to be safe in a stern to mode.
In other words, the stern should be considered for it's buoyancy, ease of
keeping the stern to the waves. A necessity to keep one of the ends to the
waves, especially at the instant of impact of the ultimate breaking wave.
That the extra buoyance of the stern aids in getting the stern to ride up
and over. That a weak stern area should be dealt with in any event and
having done so the reason for avoiding a stern to situation will have been
dealt with.
The Jordan Series drogue provides a faster response to the boat being
accelerated in front of a breaking wave. The multiple cones start the
braking process sooner, which brings the stern into square the quickest,
reduces the effects of stretch in the rode since the cones are spaced
evenly along the it.
I had not planned to write this material yet, since I have only had a
chance to read the report over once. But since the subject has come up,
here is my present take on it.
Mike
Capt. Mike Maurice
Tualatin(Portland), Oregon
Mike,
Thank you for the reference. You make some good points from the report. I
have read parts of it - I hope the most relevant.
I offer the following comments:
- The report speaks primarily to sailboats and specifically those of
Fastnet type and under 45'. These are boats of low hull profile designed for
racing, not for heavy weather in any direction. They have been built as
light as possible for the maximum wind conditions that they expect to
encounter.
Even typical cruising sailboats seldom have a high bow of the range of a
similar sized trawler.
-
The report sights their primary real world experience as the use of
Drogues by the Royal Life Boat Institute in England - where they use the
Drogue in heavy seas when wanting to make way and entering channels. -
The comments on the use of bow deployed sea anchors make two mistakes: A)
failing to deploy the anchor two wave lengths from the vessel, and B) not
using an attachment that will stabilize off the direct bow with a harness. -
It properly identifies a very large breaking wave as a potential
disaster, but states that this is generally not the conditions of severe
weather in open ocean.
Regards, John Harris
I have read parts of it - I hope the most relevant.
- The report speaks primarily to sailboats and specifically those of
Fastnet type and under 45'. These are boats of low hull profile designed
for racing, not for heavy weather in any direction. - The comments on the use of bow deployed sea anchors make two mistakes:
A) failing to deploy the anchor two wave lengths from the vessel, and B)
not using an attachment that will stabilize off the direct bow with a harness. - It properly identifies a very large breaking wave as a potential
disaster, but states that this is generally not the conditions of severe
weather in open ocean.
Reading part of the report is a bad idea.
- The conclusions of the report and the testing done is not targeted at
Fastnet type racing boats. - The conclusions do not recommend the use of the single point drogue or
single point parachute anchor, for reasons discussed in the report. Single
point systems suffer from 2 major problems. Collapsing and occasional
occurrences of being thrown out of the water. - 2 wave lengths requires a rode of 400 to 600 feet minimum. A careful
reading of the drag device data book shows that really long rodes are
necessary. - VERY large breaking waves are not common. Large breaking waves are more
so and such waves are capable of rolling or pitchpoling the size of vessels
that are of interest to us.
You will not be able to deploy the drogue of choice, whatever that may be,
if you have waited until conditions are apparent, except maybe the Jordan
Series Drogue. Mr. Jordan makes absolutely no monetary gain from his
invention as he has placed it in the public domain. The collapsing and
being thrown out of the water, if they occur will most likely happen
without your knowledge and may do so at such time as to leave you no
options and mortally exposed.
I have been in storm force conditions, 5 or 6 times times, not gale force.
And I have never considered putting out a sea anchor/drogue, even where I
had one.
I have read Lin/Larry Parde's parachute anchoring book and studied their
system. What they have written about with their 2 point triangle style
system makes excellent sense. And I have mentioned their work on T&T.
However, the Jordan series deserves serious consideration due to the fact
that I suspect it will save a vessel in conditions that the Pardee system
will not.
This CG report is only one facet of a larger series of tests which deserve
our attention. The tests of subjecting small vessels to breaking waves,
done in tank tests. Where it has been demonstrated that there is NO
configuration of draft, width, length or weight of boats under 65' (66' is
only being arbitrarily excluded here), which will protect such vessels from
being pitchpoled or rolled over, if the wave is large enough in relation to
the boat. It appears from my research that only the Jordan Series drogue
has the best chance of preventing these undesirable events from occurring
from the ultimate breaking wave.
Vessels without tall masts are more susceptible of rolling due to the lack
of roll moment inertia. Motorboats generally have this characteristic. This
means Passagemaking Under Power.
More later.
Mike
Capt. Mike Maurice
Tualatin(Portland), Oregon