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Flying Pig[_2_] Flying Pig[_2_] is offline
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First recorded activity by BoatBanter: Mar 2009
Posts: 782
Default Shake and Break, part 3

wrote in message ...

On Thu, 23 Apr 2015 07:14:36 -0400, "Flying Pig"
wrote:

Hi, Bruce,

Yes, but :-)


From your description you seem to have an "all dancing, all singing",

nav system. Doesn't your GPS positioning system tell you all that?

No. Or if it does, I've not discovered that secret yet. I use it like
dead
reckoning - estimates in my head. I get heading and COG and SOG, but
nothing fancier than that and the wind which shows analog apparent and
numeric velocity - no calculation for true wind, either.


But, isn't COG/SOG the critical information? I remember going up the

Malacca Channel one trip with a very inefficient propeller doing,
according to the impeller operated speed log, about 4 K... Against a 3
K current. I've also been traveling the other way with the speed log
indicating 3 K. In nether case did the speed log give a very accurate
picture of when we would get to Port Dickson :-)


Yes, of course. We've done some calibration before, so depending on the
speed range (they vary on a scale, so slow may not be accurate at high, if
you have to throw in some adjustment), we do generally have a pretty good
sense of how fast we're going through the water.

A solution I've seen that works with apparent success and completely

eliminates the raw water pump is the use of a keel cooler which, if I
were building a new boat I believe that I would look at very closely.



One of the owners of the company I worked for in Indonesia bought a

Grand Banks and had so many raw water pump failures on the twin
Caterpillar engines that he bought two spares and kept them in the
engine room ready to bolt on when (not if) one failed.

We don't keep them in the ER, but they're readily accessible. In our case,
"failure" merely means a drip, so it's not a catastrophic failure.

Or, at least, I've never had a bearing fail on me; there's always a first
time!


That was an explanation of how simple a keel cooler could be. A more

luxurious example would be like something shown at
http://tinyurl.com/nmyh6sd

This one's
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a Frigoboat unit; we were VERY pleased with our system until it
catastrophically failed. I only wish our new system was even close (it eats
about double the amphours) to as efficient as our Frigoboat was.

The commercial versions were much nicer, but I'd still not be happy with all
that hanging under the boat, for lots of reasons, hot stack being the least
of them :{))

The amp hours our reefer eats is prodigious - up to an average of about 10
per hour, running our BD80-driven SeaFrost 3-evaporator-plate in low-80s air
and water. The only saving grace in this
working-just-fine-but-insanely-hungry system is that defrosting is a piece
of cake compared to the Frigoboat, considering that the plates are encased
in SS, with no bumpy spots to hold the ice, as was the case in the FB.

L8R

Skip, wishing for more wind and sun, as we keep up with it if we have clear
skies and 15 knots...


Morgan 461 #2
SV Flying Pig KI4MPC
See our galleries at www.justpickone.org/skip/gallery !
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When a man comes to like a sea life, he is not
fit to live on land.
- Dr. Samuel Johnson