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Saturday, March 10, 2007

Slight Change in Plans

Like this never happens... After taking measurements for bulkhead templates and plotting them in CAD, I calculated size of materials needed for the fore and aft bulkheads. Total is about 20,000 sq inches. Now, my supplier provides the materials in 4'x8' sheets. However, for strength purposes, it is best to minimize the number of joints by constructing the bulkhead with as few pieces as possible. With these measurements, if they are constructed from 5'x10' sheets, I can minimize the number of joints. Most bulkheads can be made from two pieces using 5'x10's. But this size of sheet stock can only be special ordered. What's more, the size of the pieces are too big to fit through the companionway or through the cockpit floor. So, the current state of things has the main salon floor incomplete, it is still temporary. We have decided to postpone fore/aft bulkhead installation and, instead, finish the main salon floor. This will allow the following to be finished:
  • final measurements for all bulkheads. This will give total sheet stock requirements so we can place one BIG special order.
  • final smoothing and glassing of the center bilge
  • tank spaces so tank fabrication/installation can begin
  • take final hull measurements for CAD to more precisely layout the main salon.

When it comes time for bulkheads (maybe later this summer), we will hire a crane to come in and hinge up the front of the deck off of the hull so the pre-cut bulkheads can be slipped into the boat. Whereupon they can be trimmed and permanently installed.

Speaking of tanks, I ran preliminary volume calculations and came up with 380 US gallons (fuel and water). The original Westsail 42 sales literature (1978) spec'd total tankgage at 456 (US?) gallons total. I was expecting my calculations to be more space efficient and tankgage would therefore be more than original. I cant see where to get 450 gallons under the main salon floor so I kind of question the sales literature. Anyway, we'll see where the numbers end up once we get under there.

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