Boat/seastead survival in a hurricane


#61

I think if a barge were the way to go in hurricane territory, the oil industry would have used a barge.
They got the funding to build gold-plated barges, if that was the best way to seastead the way oil rigs do.

And i ain’t talking about just flip ships, even though seems like they could also be used as a forest, and then connected with some kind of pontoon bridges maybe?
That way folks could have their sea property surrounding their flip ship, like they used to having on land.

A 4 spar design oil rigs seems just right, because that’s also a proven design, as are their single spar platforms.
One spar of 4 could have a medical clinic, the other a supermarket, the other 2 dwellings.
Seems like each spar is certainly big enough to have a heck of a big usable space in it above surface, and plenty of storage down below.

To get started, seems like the cheapest way might be to have old oil rig spars refurbished for seasteading, after having all the unnecessary drilling stuff taken off and the top platform repurposed for whatever the seasteaders need.


(Wilfried Ellmer) #62

…aahm - in fact the oil industry has, and still does…
you might want to google up the following terms:

Nkossa
Prelude
brazil pre salt
FLNG
FPSO

To properly understand what is out there, and working fine already in category 5 cyclones.

Kindest Regards

Wil


#63

Fair enough, but those seem to be old technology, and mostly repurposed tankers, and meant to be stationed closer to shore, and required to be that massive to survive. No?
Why were spar platforms used to drill then rather than these barges?
Is it not because spars are more stable than even these massive barges?

If I understand right, maybe this is why a barge ain’t as good as a spar?

This seems to be the latest tech:
http://teekay.com/business/offshore/unit-for-maintenance-and-safety/arendal-spirit/

Not a spar, but cylindrical still, and here is why:
http://www.sevanmarine.com/intra/1110-comparable-model-test
http://www.sevanmarine.com/intra/1106-geo-statoinary-hull
http://www.sevanmarine.com/solutions/cyclonic


#64

N’Kossa is a mega barge, moored in tension the same as a tension-leg platform. Not comparable to a ‘barge’ that isn’t designed for that.


#65

Forget about the FLIP or spars to ride a hurricane on,…

If crazy enough to ride a hurricane @ anchor, the best chances are on a “barge like structure” with a regular bow, CUSTOM built for seasteading purposes:

  1. A hull twice as thick as per highest Lloyd’s or ABS specifications, built from steel rebar reinforced concrete with water tight collision bulkheads.

  2. A strong running engine capable of moving your seastead at a minimum of 10 knts and with fuel tankage for @ least 1000 nm range.

On anything else, chances are that in a Cat. 3.4.5, a poorly built seastead won’t make it.

Since it is very likely that the first seasteads will NOT be built to the above specifications due to financial constraints, than point 2. is a must have in order to be able to move the seastead to sheltered waters, @ least 300 nm out of the hurricane path.


#66

Well, that don’t seem right, because spar platforms ride out hurricanes at anchor, right?

What about these cork shaped bobber buildings above that Sevan Marine is fielding that they say are fit for cyclonic areas?


Why wouldn’t that be better than a barge, especially if it’s built with an extra thick hull yo mention also?
http://www.sevanmarine.com/intra/1110-comparable-model-test
In fact, the one above is a double-hull.

And what about the assertion that hurricanes don’t cross the equator?
So, if the seastead is put say near Kiribati, it wouldn’t even be directly hit by hurricanes - just their peripheral storms as they pass north and south of the site.

Why wouldn’t that work for any kind of hardened vessel, except of course for the TSI Fantasy Islands design?


#67

Maybe so. But are the spars platform best suited for seasteading? What would make a vertical (spar) option better than a horizontal (barge like) one?

Nothing @ all. Actually, spar it’s the worst option.

You need space (horizontal area) to run solar panels arrays. You need space for GREEN areas. You need space for docking boats.

Half of the cubic space on a spar is bellow the waterline. A waste in terms of “seasteading economics” with low “resale” value.

85% of the cubic space on a “barge like structure” it’s above the waterline, prime “resale” value.

It’s not an assertion, it’s a fact. No hurricanes have passed or formed 5 degrees N or S of the equator. Coriolis force.

Correct. An equatorial location for a seastead would be the best.


(Chad Elwartowski) #68

The Seasteading Institute isn’t building anything. They are a non-profit research organization.


#69

https://earthobservatory.nasa.gov/IOTD/view.php?id=3441

Storms like Typhoon Varmei aren’t supposed to happen. So when U.S. Navy ships were hit by this tropical cyclone in the South China Sea in December 2001, researchers at the Naval Postgraduate School, Monterey, Calif., decided to take a closer look. “For centuries, sailors haven’t worried about tropical storms near the equator,” says Dr. C. -P. Chang, a meteorology professor at the school, “It’s a rule that cyclones are not supposed to develop there.”
The textbooks say that cyclones such as hurricanes (or typhoons as they’re called in the western Pacific) don’t form within 300 kilometers (about 186 miles) of the equator. Typhoon Varmei proved to be an exception to the rule. It spun up just 150 kilometers (about 93 miles) north of the equator—much closer to Earth’s midriff than any other recorded storm.
NASA researchers found that a combination of topography and meteorology, rather than Earth’s rotation helped jump start the cyclone. A strong blast of air from Asia, called a monsoon surge, funneled rapidly down the South China Sea, reaching the equator in a narrow stretch of ocean between Malay Peninsula and Borneo.
To figure out just what happened and how likely it was to happen again, Chang and two visiting professors from Taiwan analyzed data from several weather models and detailed measurements of wind speed and direction provided by NASA’s QuikSCAT satellite. They discovered that not only did Typhoon Varmei develop in a very unlikely spot, it also got its start in an unusual way.
“In the case of Varmei, everything was just the right size and in the right place and stayed long enough. We calculated that the odds of this happening again are about once every 100 to 400 years,” Chang says.
In the image above QuikSCAT’s scatterometer reveals the strong surge of winds coming from the north and the curve they make to help give birth to Typhoon Varmei near the equator (the horizontal blue line) on December 26, 2001. Color indicates wind speed (purple and blue indicate winds, while red a pink indicate high winds—over 60 miles per hour). Arrows show the wind direction.


#70

Sailing Spar developed for studying hurricanes…

Interesting design,

definitely worth a thorough think-through

https://www.lib.washington.edu/commons/events/scholarsstudio/past/robot/robotic-hurricane-sailboat


#71

23 in 56 years… avg almost 1 every other year, though they are clustered…


#72

WOW! Good find JL.

I guess not everything taught @ the Naval Academy is 100% true :smile:


#73

The Weather Channel teaches it wrong, too… LOL


#74

For that matter…

Hurricanes
A large part of French Polynesia is situated in an area where there is a risk of hurricanes, tropical storms and tropical depressions. Hurricane season is from the end of October till June. During hurricane season there is a risk of hurricanes or bad weather because of tropical depressions in the vicinity.

http://www.whatstheweatherlike.org/french-polynesia/