P.T. Boats were powered by three 4M-2500 Packard Marine Engines developed by the Packard Motor Car Company specifically for the United States Motor Torpedo Boat program. The Packard Marine is a powerful high-speed supercharged, lightweight engine of the aviation type.

Basic characteristics

  • 60 degree Vee-type twelve-cylinder
  • Liquid cooled
  • 4 stroke cycle
  • Fuel - 100 octane aviation gasoline

Horse power

  • 1200 hp - 1940
  • 1350 hp - 1943
  • 1500 hp - 1945

Increases in horsepower were made to compensate for the constant additions of heavier armament put on the boats during WWII. P.T. Boats achieved 45 knots top speed during shakedown testing but averaged about 40 knots under normal combat conditions.

The forces of nature had profound effects on the PT boat's speed. Warm sea temperatures would hinder the engine's cooling systems and sea growth on the bottom of the boats would also reduce speed performance. The height of sea swells would not only affect speed but could damage the boat and possibly injure the crew if a PT Boat tried to run head-on into a 12-foot sea at high speeds.

 

"It was a very, very good experience for me even though I lost my left arm, and I was left handed, you know."

-Belton Copp

Photo: Dan Nerney

COURAGE UNDER FIRE: Brilliant, handsome, and athletic, twenty-one-
year-old Belton Copp was poised to inherit a life of privilege on December 6, 1941. The grandson of legendary nature artist John James Audubon, Copp was a varsity playmaker on the Yale gridiron when the Japanese Imperial Navy launched their surprise attack on Pearl Harbor.

Copp enlisted in the Navy, triggering a series of events that would land him on a motor torpedo boat in the Pacific, speeding headlong into the jaws of the Japanese. In his final firefight, Copp was wounded in the arm, which became gangrenous and required amputation.

Says Copp, "It was the best thing that happened to me really - this whole incident -because until then I'd had everything my way, you know - Exeter (Academy), Yale, all that stuff - and a football player. And I learned that there are some people that aren't quite that lucky. It was a very, very good experience for me even though I lost my left arm, and I was left handed, you know."

Visit Battleship Cove to explore the Veterans' Voices oral history archives, or click here to listen to samples from the collection.

VICTORY AT SEA 2005: Emily and Dominic DiMaggio want you to save the weekend of July 16-17 for Battleship Cove's major summer fundraiser, Victory at Sea. Now in its fourth year, this blockbuster weekend combines yacht racing in America's Cup thoroughbreds with a gala dinner on the USS Massachusetts fantail. Click here for more.
STARS & STRIPES: Join the elite ranks of the Stars & Stripes Commission! Battleship Cove's most prestigious level of annual giving, Stars & Stripes enlists an exclusive group of...Ctd.
Your photo here: Do you have a great PT boat photo? Send it to our Webmaster, and maybe we'll post it online!

 

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Your photo here: Do you have a great PT boat photo? Send it to our Webmaster, and maybe we'll post it online!
Your photo here: Do you have a great PT boat photo? Send it to our Webmaster, and maybe we'll post it online!