Wednesday, October 26, 2011

Design 701 - L.P.T. Boat

During World War II, the firm designed a number of vessels for the U.S. Navy. Here is L.P.T. (light patrol torpedo) vessel #810. Two boat were built to this design by Bath Iron Works of Maine. They were launched in 1946 and 1947, respectively.

PT810 was powered by four Packard 12-cylinder gasoline liquid cooled aircraft engines developing 2,500 hp each for a top speed of 35 knots, fully loaded.

Here are the plans.

Principal Dimensions
LOA 89'-6"
LWL 85'-2"
Beam 24'-5"
Draft 4'-5"
Displacement 210,000 lbs


  1. From and National Archives:
    •Laid down 1 December 1948 by Bath Iron Works, Bath, ME
    •Launched 2 June 1950
    •Completed 24 November 1951, assigned to MTBron1 (PW) at Norfolk NOB.
    •Struck from the Naval Register 1 November 1959 and placed in dry storage at Philadelphia NSY
    •Reinstated on the Naval Register and reclassified as Patrol Boat Fast, PTF-1, 21 December 1962 and sent to DaNang, Vietnam with PTF-2 (xPT-811) and PTFs 3 & 4. Known incountry as one of the "gassers."
    •Sunk as a target December 1965 off Oahu, Hawaii.

    She was equipped with four 16 cylinder Packards, 2500 SHP each, not the 12 cylinder engines of the WW2 boats.

    Quotes from the workers at Bath Iron Works say PT-810 was the fastest boat they had ever put in the water.

  2. Sorry, a couple of other items:
    *PT-810 was the only S&S design boat in the post war aluminum boat series. Originally there were to be two, but the Navy opted to open the design competition to four designers; S&S (PT-810), Philadelphia NSY (PT-812), Electric Boat (PT-809), and Annapolis Yacht Yard (soon to be Trumpy and Sons) (PT-811).
    *Her top speed, as recorded in the boat's deck logs, exceeded 50 knots. A problem because the torpedoes she was designed to launch (and never did) could barely break 40 knots.