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Old 04-19-2012, 09:22 PM   #110
Marin
Scraping Paint
 
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Join Date: Oct 2007
Posts: 13,745
Yes. that's the outer layer of planking in the photos. The PTs were double-diagonal planked with a layer of doped canvas between the two layers of planking. Basically just like a big, giant Chris Craft runabout which were also double-diagonal planked with doped fabric between the layers. The decks of the PTs were also planked with the planks running straight fore and aft. The deck planks were not curved in with the hull at the bow like GBs and whatnot.

The only plywood used in the PTs was in some of the superstructure like the chart house, day room, interior bulkhead surfaces, and .50 caliber gun turrets. Plywood only bends one way so it could only be used on flat or simple curved surfaces like the deck houses and gun tubs.

The hulls were framed upside down and planked upside down and then flipped over in place for installation of the decking. The hulls were then put on dollies and moved out of the hull assembly building to the final assembly building for finishing. The interiors, such as they were, were installed after the decks were on but before the charthouse and dayroom structures were lowered into place. Then came engines, generators and the big hatch over the engine room.

When completed and the armament installed---- four torpedos, two twin-fifty machine guns and, in the first part of the war, one 20mm Oerlikon cannon--- the boats weighed 51 tons, 102,000 pounds (they were ten tons heavier by the end of the war). Power was three 1,350hp gasoline engines. The Navy would not accept a boat unless it achieved and maintained 43 knots fully loaded during sea trials.
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