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Re: T&T: Anchor comments

CM
C. Marin Faure
Sun, May 31, 2009 12:23 AM

Do all those with Rocna, Manson, etc. anchors also have a wash down

system?

It probably depends on where you boat.  We've had our Rocna come up
pretty clean when anchored to a sandy bottom.  But when the bottom is
mud, or weedy mud, or oozy mud, or sandy mud, or anything "clingy,"
the Rocna can bring up an impressive load.  Under these conditions, I
would say a washdown system is a must, although not so much because
of the anchor.  You can knock most of the stuff off the Rocna with a
boathook as long as you aren't anal about cruising around with a
pristinely clean anchor.

Of more concern is the chain.  Like most trawler operators in the PNW
we use an all-chain rode.  Over a muddy, oozy, or mud-and-shell
bottom, the chain comes up with a LOT of muck on it.  If you don't
blast this stuff off somehow it ends up in the anchor locker where at
best it makes a mess and drops dried mud down into the forefoot bilge
and at worst stinks to high heaven as the critters in the mud die off
and rot.  A wash down system is the only practical way of dealing
with this.

A previous owner of our boat installed a powerful washdown pump in
the engine room that consists of a 3/4 horsepower Westinghouse AC
motor driving a big bronze Jabsco pump.  According to the spec sheet,
the thing is capable of delivering 23 gallons a minute at up to 26
psi.  It is still sold today as the Jabsco Model 6050.  It pulls
water from a dedicated through-hull/seacock and is plumbed with heavy
hose to spigots on the fore and aft decks.  It barely moved water
when we bought the boat and it lingered near the bottom of our to-do
list until last summer when I figured I'd better overhaul it prior to
our cruise to Desolation Sound where we would be doing a lot of
anchoring.  So I overhauled the pump and now, even considering the
long hose run from the engine to the bow, it puts out a pretty
powerful stream of water.  More than enough to blast the heavy muck
off the chain and the anchor.

Were we installing a washdown pump ourselves I don't know that I'd
have gone this route, partly because of the expense (the Model 6050
today typically sells for some $600-plus), but mainly because if we
want to use it we have to start the generator.  Our inverter will run
the pump but with the stock alternators already working to capacity
to supply the power being sucked out of the batteries by our Lofrans
windlass, I figure it's easier on everything simply to get the AC for
the pump from the generator.  So I'd probably tend to go with as
strong a DC washdown pump as I could find.  But since we inherited
the big AC pump and the recent overhaul gave it back its impressive
performance we'll continue to use it.

One thing of note with the Rocna---- the rollbar will fill itself
with mud as you use it.  This has no effect whatsoever on the
performance of the anchor but I think it's a good idea to keep the
inside of the tube clean and dry when it's not being used.  The tube
is open at both ends to drain, and there is a drain/air hole in the
underside of the tube at the top of the arch.  But it's a good idea
when you finish a cruise and are washing down the boat with fresh
water to blast some up into the open ends of the rollbar until what
comes out the other end and the drain hole in middle is clean water.


C. Marin Faure
GB36-403 "La Perouse"
Bellingham, Washington

>Do all those with Rocna, Manson, etc. anchors also have a wash down system? It probably depends on where you boat. We've had our Rocna come up pretty clean when anchored to a sandy bottom. But when the bottom is mud, or weedy mud, or oozy mud, or sandy mud, or anything "clingy," the Rocna can bring up an impressive load. Under these conditions, I would say a washdown system is a must, although not so much because of the anchor. You can knock most of the stuff off the Rocna with a boathook as long as you aren't anal about cruising around with a pristinely clean anchor. Of more concern is the chain. Like most trawler operators in the PNW we use an all-chain rode. Over a muddy, oozy, or mud-and-shell bottom, the chain comes up with a LOT of muck on it. If you don't blast this stuff off somehow it ends up in the anchor locker where at best it makes a mess and drops dried mud down into the forefoot bilge and at worst stinks to high heaven as the critters in the mud die off and rot. A wash down system is the only practical way of dealing with this. A previous owner of our boat installed a powerful washdown pump in the engine room that consists of a 3/4 horsepower Westinghouse AC motor driving a big bronze Jabsco pump. According to the spec sheet, the thing is capable of delivering 23 gallons a minute at up to 26 psi. It is still sold today as the Jabsco Model 6050. It pulls water from a dedicated through-hull/seacock and is plumbed with heavy hose to spigots on the fore and aft decks. It barely moved water when we bought the boat and it lingered near the bottom of our to-do list until last summer when I figured I'd better overhaul it prior to our cruise to Desolation Sound where we would be doing a lot of anchoring. So I overhauled the pump and now, even considering the long hose run from the engine to the bow, it puts out a pretty powerful stream of water. More than enough to blast the heavy muck off the chain and the anchor. Were we installing a washdown pump ourselves I don't know that I'd have gone this route, partly because of the expense (the Model 6050 today typically sells for some $600-plus), but mainly because if we want to use it we have to start the generator. Our inverter will run the pump but with the stock alternators already working to capacity to supply the power being sucked out of the batteries by our Lofrans windlass, I figure it's easier on everything simply to get the AC for the pump from the generator. So I'd probably tend to go with as strong a DC washdown pump as I could find. But since we inherited the big AC pump and the recent overhaul gave it back its impressive performance we'll continue to use it. One thing of note with the Rocna---- the rollbar will fill itself with mud as you use it. This has no effect whatsoever on the performance of the anchor but I think it's a good idea to keep the inside of the tube clean and dry when it's not being used. The tube is open at both ends to drain, and there is a drain/air hole in the underside of the tube at the top of the arch. But it's a good idea when you finish a cruise and are washing down the boat with fresh water to blast some up into the open ends of the rollbar until what comes out the other end and the drain hole in middle is clean water. ____________________ C. Marin Faure GB36-403 "La Perouse" Bellingham, Washington