Sinking statistics.`

This from Boat US via my harbormaster association newsletter.

Sailboat Sinking Statitstics

At the Dock

Below waterline fitting 44%
Stuffing box leak 33%
Keel and Centerboard 7%
Rain 7%
Head back-siphoning 3% (Sorry Peggie)
Above waterline fitting 3%
City Water hookup 3%

Underway

Struck submerged object 40%
Prop Shaft or strut 16%
Below waterline fitting 16%
Grounding 8%
Stuffing box leak 8%
Storm/knockdowns 8%
Above waterline fitting 4%

Food for though. I was surprised how high hitting submerged objects is.

--
Roger Long

<salty@dog.com> wrote

> I find that VERY hard to believe. Maybe it was a typo or editing
> error. Then again, aren't groundings the result of hitting a submerged
> object?
>
I find it hard to believe when I look at my 1980 vintage hull but not when I
look at new boats.
Groundings are separately accounted for so I don't think they a skewing the
statistics. Grounded boats usually don't sink because the ground holds them
up.

--
Roger Long

On Wed, 12 Mar 2008 15:24:54 -0400, salty@dog.com said:

>>Struck submerged object 40%
>>Prop Shaft or strut 16%
>>Below waterline fitting 16%
>>Grounding 8%
>>Stuffing box leak 8%
>>Storm/knockdowns 8%
>>Above waterline fitting 4%
>>
>>Food for though. I was surprised how high hitting submerged objects is.
>
>I find that VERY hard to believe. Maybe it was a typo or editing
>error. Then again, aren't groundings the result of hitting a submerged
>object?

Ever heard the phrase "Jewish lightning?" In collecting on an insurance
claim, striking a submerged object is perhaps far less likely to raise
questions than some of the other items listed.

"Roger Long" <strider@maine.> wrote in news:47d82c0c$0$1081
$4c368faf@roadrunner.com:

> Below waterline fitting 44%
>

Precisely the reason why I like the way Amel does it on their boats. No
sink drain thruhulls, no unnecessary fittings through the hull at all. All
water is PUMPED overboard by a heavy duty diaphram trash pump with positive
displacement. All sinks, shower, everything except the head (thank god)
dump into a very deep bilge to be pumped out at your leisure. The pump is
a monster. Dishwashing liquid does an amazing job of keeping the whole
bilge looking like a new glass....instead of the rainwater leaking around
the mast keeping the bilge looking like a Dismal Swamp...and smelling like
it, too.

"Let Liquid Dawn move diesel oils out of your way!", the ad should read....

jeff <jeff@foo.net> wrote in
news:COydndmd2aVnrkXanZ2dnUVZ_v6rnZ2d@:

> Leaks At Outdrive Boots 4%
>

I find this number to be quite low. They must have only looked at NEW
boats. Damned rubber diaphram....the only thing between you and the BOTTOM
OF THE BAY!

On Mar 12, 11:24 am, sa...@dog.com wrote:
> On Wed, 12 Mar 2008 15:16:37 -0400, "Roger Long"

> >Food for though.  I was surprised how high hitting submerged objects is..

> I find that VERY hard to believe. Maybe it was a typo or editing
> error. Then again, aren't groundings the result of hitting a submerged


Bingo ! ! !

To understand a survey ya gots to find the difintion of "submirged
object". Lest see, the bottom of the lake, cannal, river, wing dams,
uh any thing thats under the water where a boat should not be if youre
going faster than 1.0 knots

There is a book authored by a guy who was a US Boat employee. Lots of
great fotos. Basically, the details of the above mentioned stats.....

HOwever, Id like to know how FIRE faired in this list??

bob

<tsmwebb@> wrote
> I alway leave the engine raw water open when the boat is in
> commission, but I live aboard and my engine rooms are designed so
> they can flood without sinking the boat.

I never close my intakes or any other through hulls when I'm on the boat so
it's much the same thing.

It's true that forgetting to open the intake can toast your engine (or at
least exhaust). While flying, I became comfortable living with lots of
things that, if I forget them, could toast not just my engine but me:)

--
Roger Long

On Mar 13, 3:03 pm, "Roger Long" <stri...@maine.> wrote:
> <tsmw...@> wrote
> I never close my intakes or any other through hulls when I'm on the boat so
> it's much the same thing.

I close all the below the water through hulls that I'm not using
except for the engines'. I open and close the head's valves each time
I flush and open the galley sea water/ watermaker valves only when
they are needed. Actually, the heads are between bulkheads that rise
above the waterline so in theory and in calm water they should only
flood their compartment if they fail, but I still close them.
Generally, working valves that live in sea water is if just to keep
the critters from clogging them up.

> It's true that forgetting to open the intake can toast your engine (or at
> least exhaust).

I just like to be able to get underway quickly if I have to and with
two raw water intakes 23 feet apart with separate deck access having
them off really slows down an emergency start.

-- Tom.

On Fri, 14 Mar 2008 10:11:39 +0700, Bruce in Bangkok
<b*paige*125@g*mail.com> wrote:

>>My 20 kw Kohler generator came from the factory with an elbow temp
>>sensor. From 4 years experience I can tell you that it is *very* fast
>>acting and reliable. It shuts down on a fouled raw water intake in
>>less than 30 seconds, and also picks up failing impellers, etc. Some
>>of the gurus on the trawler and live aboard lists swear by them for
>>main engines also since they are much faster acting than head or block
>>temperature alarms.
>
>Have you ever had the sensor out of the elbow? Can you tell me how
>much it extends into the elbow?

The sensor is clamped to the outside of the elbow. That's how most
folks are doing it if I understand correctly.

<tsmwebb@> wrote
>
> I just like to be able to get underway quickly if I have to ...

Are you hanging out with someone's wife that you shouldn't?

:)

--
Roger Long