Strut alloy

Discussion in 'Propulsion' started by ABoatGuy, Oct 22, 2004.

  1. ABoatGuy
    Joined: Aug 2004
    Posts: 208
    Likes: 6, Points: 18, Legacy Rep: 79
    Location: LeftCoast

    ABoatGuy Member

    Anyone know what alloy the mil-spec is for boat struts. Also open for suggestions. Lot of zinc in mag bronze, but it seems to be used succesfully. How about aluminimum bronze or Nibral. Good? Bad?

    Thanks
     
    ABoatGuy, Oct 22, 2004
    #1
  2. plowanchor
    Joined: Jan 2006
    Posts: 2
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Abilene, Texas

    plowanchor New Member

    Best that I have been able to come up with is the 5083 alloy. It seems to postpone oxidation. Two, the alloy Al. needs oxygen to be able to prevent oxidation and corrosion from salt water. So beneath the deck with out a lot of oxygen and with out a lot of raw water wash down creates the ideal place for breakdown. By default this would be my choice. But with some of the other alloys that mills are playing with now adays you may find something like what you are talking about. Try looking a " JORGENSONS" They are a pretty popular distributer of alloys in the U.S.
     
    plowanchor, Jan 9, 2006
    #2
  3. bananas
    Joined: Jul 2005
    Posts: 11
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: miami florida

    bananas Junior Member

    Hi aboatguy

    The strongest and most fatigue resistent alloy in salt water is Nickel Aluminum Bronze C95800. It is substantially better than stainless steel in those conditions. I make large propellers from it and they have proved to be very durable under the most adverse conditions.

    When you consider wash conditions, the tip a a large (40-inches+) propeller running near 150-MPH is about as severe possible.

    Some manufacturers adulterate the alloy with zinc (permissable under ABS rules) but I find that is not a good practice.

    C95800 can be cast, but the mold must be bottom filled without significant turbulence. It can be done, it is not easy.
     
    bananas, Jan 9, 2006
    #3
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.