Thresher should have a 5 bladed screw same as all the Skipjacks, although by 1968 the Skipjacks may have all changed over to the 7 blade design. I know I was working on a early 60's campaign and stole a 5 blade screw from the Soviets.
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USS Kentucky SSBN 737 (G)
Comms Div 2003-2006
Qualified 19 November 03
Yes I was really on a submarine.
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