Commander 147

[ebb]

Let's just mess around with this here for a moment.

Water, for a number of reasons, mainly because it is the basement of the vessel, will get into the encapsulated ballast keel space - even when the end of the ballast is closed off.

That's not good for a number of reasons. Not only for boats that get pulled and stay on the hard for awhile but also those that stay in the water year round.

Imco you can't close off the ballast keel unless a drain is provided. As you know some have actually installed a simple bronze drain that can be opened when the boat is out of the water.
There could be a good arguement to put that same drain in the bottom of the bilge where you would close off the ballast.
It's a damned awkward place fpr a mechanical drain thingy.
It's also the bottom of the bilge.

Pearson must have seen water captured in the ballast area as a problem and that's why they inelegantly left it open the way they did. I'd agree with them that it's best to keep water out of the bilge and as much as possible out of the laminate.

Foam in place urethane is the same. Water will get in to it. The boats need a sump as deep as the turn of the fiberglass at the bottom to collect water to be pumped out. Water always gets in - need a relatively easy way to get it out.
A dusty bilge will help keep the boat smelling sweet.


Some have filled the space around the encapsulated ballast with two part plastic. Expensive, but it seems to solve that problem. There are some other reasons besides water being stuck in the cavity that imco filling the space is a good thing. Main reason is that adding plastic in there structurally benefits the keel.
Some of our Ariels and Commanders seem to be pretty thin of hull.

The whole weight of the boat sits on it's laminate when on the hard. And it sits right where the ballast is. The ballast does NOT form fit the space it sits in. The only thing that keeps the ballast from shifting is the tabbing across the top! Imco filling the space around the ballast creates a more solid base where all two and a half tons plus are concentrated when in the jacks. That's my arguement.


Painting a barrier coat on the bottom is not strictly necessary for our A/C's.
But it could lead ultimately to a drier boat. If you do go that route then imco the space around the ballast should be filled.
IMCO
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WAY LATER EDIT: I'm sure it has occured to some owners, but there is an important safety issue on whether the lead ballast needs to be
filled/injected with 2-part plastic...or not. If you accidentally get a leak by grinding a hole or cracking the hull in the area of 'encapsulated' ballast that is open to the sump where your pumps are....you have no way of stopping that water from coming in.

A338 also had a large 'hollow' in the turn of the bottom the keel, I mean under the boat where the ballast is, that had been filled with a bondo like substance. It was fairly easy to dig it out - it was not covered over with fiberglass. It was a Pearson created booboo.
Fixed it with epoxy & biaxial matt.
However a flaw is a flaw is a weak area. When on the hard the whole weight of the boat is balanced on this turn of the bilge. This probably led my thinking to epoxy/lead composite...and subsequently over-building the bilge....

C147 showed the same Pearson anomaly. I'm absolutely sure these were considered cosmetic repairs at the factory. They filled in these caves and delivered them to the dealer painted over. It's pretty obvious that the poor souls laminating the hull with live polyester had some concentration lapses pushing wet roving into deep reaches of the bilge. How many other hulls have these flaws?

If you are not filling in the encapsulation void with liquid plastic, then make damn sure the ballast chamber is completely isolated from the interior of the boat.