Welcome to the WWII Forums! Log in or Sign up to interact with the community.

Paxman Diesel Engines in RN Submarines

Discussion in 'Submarines and ASW Technology' started by Fred Wilson, Nov 27, 2015.

  1. Fred Wilson

    Fred Wilson "The" Rogue of Rogues

    Sep 19, 2007
    Likes Received:
    Vernon BC Canada
    RN Paxman Submarine Diesel Engines
    Home Page: http://www.paxmanhistory.org.uk/

    A document produced by Paxman in 1945 says the Company manufactured all the diesel engines for U Class submarines.
    Initially these were a 6 cylinder type, built to an Admiralty design, with a fabricated main frame and an output of 307 bhp at 600 rpm.
    Paxman started delivering them (2 engines per boat) in 1938, before war broke out.

    U and V Class submarines fitted with Paxman-built engines, as recorded in the Paxman order book, were:


    Paxman's 6RXS was specially developed for service in submarines, the fabricated (welded) steel frame being better than a cast one for withstanding the shock of underwater explosions.
    It produced 400 bhp at 825 rpm and was coupled to a 275 kW generator by a Wellman-Bibby flexible coupling.
    The engines were made in pairs, left and right handed, so that all controls were between the two engines.

    The U and V Class boats were the first British submarines with diesel-electric drive.
    They were also the Royal Navy's only diesel-electric submarines until the post-War P and O Classes and then the Upholder (now Victoria) Class boats.
    The electric motors in the U Class were built by General Electric and had a combined rating of 825 bhp. General Electric also supplied the electric motors for the V Class boats.

    Detailed information continued at: http://www.paxmanhistory.org.uk/paxsubs.htm
  2. gtblackwell

    gtblackwell Well-Known Member

    Jul 4, 2006
    Likes Received:
    Auburn, Alabama, US
    Interesting post. I had not thought of welded steel mounted engines being better to resist shock but then there is much written on riveted shiops vs welded, the riveted ones being more flexible. I would think rivets would pop. I often wondered about tank construction along similar lines.

    Type V11 UBoats had about 2100 horse power a pair, big difference but electric motors were closer.

Share This Page