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Old 30-05-2019, 20:44   #1
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Ran tan II. Lost keel

The racing yacht Ran Tan II has lost its keel of Mexico all are safe and waiting rescue vessel to arrive.

https://www.sailingscuttlebutt.com/2...nroute-to-usa/
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Old 30-05-2019, 21:32   #2
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Re: Ran tan II. Lost keel

Fortunately, they had cold beers while waiting for rescue
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Old 30-05-2019, 22:24   #3
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Re: Ran tan II. Lost keel

Ya know, Chuck Hawley (member here by that name) sailed Charley back to HI without its keel, with the crew.... Maybe those guys could sail her, albeit slowly, and avoid salvage.

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Old 31-05-2019, 00:55   #4
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Re: Ran tan II. Lost keel

Sitting upright with no keel? That's impressive. that's a very slender keel with limited room for attachment. Not sure I'd sleep well on that boat.
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Old 31-05-2019, 06:25   #5
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Re: Ran tan II. Lost keel

Hopefully the Mexican fishing boat that responded to the mayday call will take the vessel in tow to port for repairs .
I would really like to see what failed
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Old 31-05-2019, 06:27   #6
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Re: Ran tan II. Lost keel

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Sitting upright with no keel? That's impressive. that's a very slender keel with limited room for attachment. Not sure I'd sleep well on that boat.
not really that impressive 99% of sailboats will stay upright without the ballast just don't try to sail with full canvas on anything but ddw :-):-)
The slightest heel could send you into a knockdown type condition .
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Old 31-05-2019, 07:15   #7
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Ran tan II. Lost keel

I remember a post I believe with pictures of a Charter boat that the people took back cause it was super tender, only to find that they had been given a boat with no keel, prior Charter had somehow knocked it off.
Some boats are designed I guess so that they have limited stability without the keel?
I’d think that it wouldn’t be most though? I have no idea really, just guessing on my part.
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Old 31-05-2019, 07:36   #8
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Re: Ran tan II. Lost keel

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Originally Posted by a64pilot View Post
I remember a post I believe with pictures of a Charter boat that the people took back cause it was super tender, only to find that they had been given a boat with no keel, prior Charter had somehow knocked it off.
Some boats are designed I guess so that they have limited stability without the keel?
I’d think that it wouldn’t be most though? I have no idea really, just guessing on my part.
I think many modern hull shapes (wide and flat) would sail fine in light conditions without a keel. They have a lot of form stability.

Brazilian polar sailor Amyr Klink designed Paratii 2, his last polar exploring boat, without a keel (and if I recall, no internal ballast), relying only on form stability (and size, at over 100 feet LOA). He's taken it to Antarctica a number of times and it seems to be an excellent boat in adverse conditions.

https://pt.wikipedia.org/wiki/Ficheiro:Paratii_2.jpg
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Old 31-05-2019, 07:41   #9
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Re: Ran tan II. Lost keel

said irish eyes was dismasted--i hope they made it back into port safely also.
what a tough break. i hope boat is towed to safety.
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Old 31-05-2019, 07:47   #10
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Re: Ran tan II. Lost keel

For boats with nice big arses (aka lots of stability) I would agree, but Ran Tan is a narrow speedster. Must have had lots of beer cans in the bilges.



Quote:
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not really that impressive 99% of sailboats will stay upright without the ballast just don't try to sail with full canvas on anything but ddw :-):-)
The slightest heel could send you into a knockdown type condition .
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Old 31-05-2019, 08:43   #11
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Re: Ran tan II. Lost keel

Update the crew is safely on a 1,000 ton Mexican fishing vessel and in good spirits .
It also appears that they scuttled Ran Tan II
https://livesaildie.com/ran-tan-ii-activates-epirb/
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Old 31-05-2019, 10:15   #12
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Re: Ran tan II. Lost keel

Looking at that narrow, long keel with the huge bulb on the bottom, amazed that it hadn't fallen off long before this.
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Old 31-05-2019, 10:22   #13
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Ran tan II. Lost keel

Quote:
Originally Posted by roverhi View Post
Looking at that narrow, long keel with the huge bulb on the bottom, amazed that it hadn't fallen off long before this.


You can make it so that a high aspect keel is very, very strong.
It’s tougher to do though than a low aspect one, just like it is for wings on airplanes.
To me I think it’s nearly identical, sailplanes have extremely long, thin wings, but are strong.
Older Pipers for example had what was called a “Hersey bar” wing, one advantage of the Hersey bar was it could easily be extremely strong, but gave up aerodynamic efficiency.
Keels seem to have very similar traits.

They way I seem to find my way around anchorages by Brail, such a keel is certainly not for me.
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Old 31-05-2019, 11:03   #14
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Re: Ran tan II. Lost keel

Quote:
Originally Posted by roverhi View Post
Looking at that narrow, long keel with the huge bulb on the bottom, amazed that it hadn't fallen off long before this.
it is a canting keel .
Quite common on modern big racing designs
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Old 31-05-2019, 14:08   #15
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Re: Ran tan II. Lost keel

a64-
There's a classic book called "Principles of Naval Architecture" dating back to maybe 1980 or earlier, that goes into hull shapes and form stability vs dynamic stability, among many other interesting points.
You know what they say in NASCAR? "If you didn't break anything, you ain't racing."
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