Right you are Seadog, kinda going off the track here, but U.S. PTs came in as many configurations as there were Skippers.
The torpedo problem was the vintage Mark VIII WW1 destroyer torpedo 20 ft 6 in long, slow, weak, and unreliable. Only thing available in the beginning.
Later on the Mark XIII aircraft torpedo, 13 ft 6 in, more performance, reliability, and hitting power. Not to mention they could now carry 4 instead of 2. (As the boats stretched out)
A factory installed (as the war progressed) Army P-39 fighters 37mm cannon was forward on the 80 ft Elco boats. Sometimes a 20mm behind that (still forward). In the rear either a 40mm Bofors, or a single (or up to) a Quad 20mm (copied from S-Boats). "Home-Jobs" included 2-3 Rocket launchers forward (only good against land targets), Six Bazookas (contrived together) center to give a fighting chance against F-lighters.
F-lighters were shallow draft diesel powered supply barges used in the Mediterranean. (the Japanese had the same only different)(throughout the Pacific islands) When heavily armored and heavily armed, with as many guns as could be bolted on up to 88mm, renamed Flak-lighters.
A nasty suprise, same look, but one hit and you're done!
The 109 (JFK) had an 80 ft Elco 2 twin 50s, a 20mm aft, and he added a 37 up front.
Crew sizes for S-Boats
S-80...16, 36 kts
S-100...23, 42 kts

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Morbius, Morbius! Something is approaching from the Southwest. It is now quite close.