Lack of data about steel multihulls

Discussion in 'Multihulls' started by Muzammal, May 18, 2021.

  1. Muzammal
    Joined: Dec 2020
    Posts: 16
    Likes: 0, Points: 1
    Location: Pakistan

    Muzammal Junior Member

    Hi everyone
    I have been searching for steel multihulls especially trimarans in 50 foot size range (little bit more ir less) for a long time but there is no data available on internet which can be considered as an example or model.
    Does anyone have ideas or links of this kind? Please share with me
    Thanks and regards
     
  2. TANSL
    Joined: Sep 2011
    Posts: 6,551
    Likes: 408, Points: 93, Legacy Rep: 300
    Location: Spain

    TANSL Senior Member

    What information do you need because I have found enough just by typing "catamarans 50 feet". If you are looking for body lines plans and developed projects, you will not find, fortunately.
     
  3. Muzammal
    Joined: Dec 2020
    Posts: 16
    Likes: 0, Points: 1
    Location: Pakistan

    Muzammal Junior Member

    In "Catamarans 50 feet", "steel" is missing
     
  4. TANSL
    Joined: Sep 2011
    Posts: 6,551
    Likes: 408, Points: 93, Legacy Rep: 300
    Location: Spain

    TANSL Senior Member

    Yes, I was wrong to transcribe the text. Never mind, search for "trimarans 50 ft steel".
     
  5. Ad Hoc
    Joined: Oct 2008
    Posts: 6,892
    Likes: 845, Points: 113, Legacy Rep: 2488
    Location: Japan

    Ad Hoc Naval Architect

    There are none.
    That's why!
     
    Lloyd Too, DogCavalry and jehardiman like this.
  6. jehardiman
    Joined: Aug 2004
    Posts: 2,981
    Likes: 502, Points: 113, Legacy Rep: 2040
    Location: Port Orchard, Washington, USA

    jehardiman Senior Member

  7. Ad Hoc
    Joined: Oct 2008
    Posts: 6,892
    Likes: 845, Points: 113, Legacy Rep: 2488
    Location: Japan

    Ad Hoc Naval Architect

    It also seems like people 'select' their hull choice before they even establish an SOR and design to that SOR too... no wonder so many mistakes and misinformation out there.
    Choices are being made about a hull form - without understanding why the hull form may or may not even be suitable for their SOR.
    It is fashion.. a trend... that's all sadly. :(
     
  8. TANSL
    Joined: Sep 2011
    Posts: 6,551
    Likes: 408, Points: 93, Legacy Rep: 300
    Location: Spain

    TANSL Senior Member

  9. jehardiman
    Joined: Aug 2004
    Posts: 2,981
    Likes: 502, Points: 113, Legacy Rep: 2040
    Location: Port Orchard, Washington, USA

    jehardiman Senior Member

    redreuben and TANSL like this.
  10. Ad Hoc
    Joined: Oct 2008
    Posts: 6,892
    Likes: 845, Points: 113, Legacy Rep: 2488
    Location: Japan

    Ad Hoc Naval Architect

    There you go.. there is one.. finally!!

    Built in 1995...so, how popular has this ONE been then..?
     
  11. Mr Efficiency
    Joined: Oct 2010
    Posts: 9,857
    Likes: 875, Points: 113, Legacy Rep: 702
    Location: Australia

    Mr Efficiency Senior Member

    I notice in their list of boats plans (you download the list from the website) there is a 57 foot catamaran ketch "Esmeralda" which is for either alloy or steel.

    Yachts (buildaboatplans.com.au)
     
  12. Mr Efficiency
    Joined: Oct 2010
    Posts: 9,857
    Likes: 875, Points: 113, Legacy Rep: 702
    Location: Australia

    Mr Efficiency Senior Member

    I expect any boat where the hull surface area is high per unit of displacement, is going to go against steel, because pitting and rusting would perforate a thin shell much earlier, even though the strength may be quite adequate with the thinner material.
     
  13. Ad Hoc
    Joined: Oct 2008
    Posts: 6,892
    Likes: 845, Points: 113, Legacy Rep: 2488
    Location: Japan

    Ad Hoc Naval Architect

    One would only use steel to "save" money.. since with such a high ratio of structure weight for its size/shape why use steel?
    Ergo could only be what they consider to be cost savings..but that is merely initial capex cost of materials...the outfitting costs would swallow that budget easily!
    ...not to mention the usual 'suspects' of using steel as a material for boats, as you note Mr.E.

    Which si why there are next to none out there of that size in steel...
     
  14. comfisherman
    Joined: Apr 2009
    Posts: 101
    Likes: 35, Points: 28, Legacy Rep: 10
    Location: Alaska

    comfisherman Senior Member

    Wheel abraided pre primed isn't cheap, anything less is lots and lots of blasting. Blasting in voids, and confined places. Add in blast media then add primers and top coats, not even factoring maintenance it gets close to aluminum pretty quickly.

    Peer of mine just did a big refit on a decent size fishing vessel. Hull and cabin were steel, new house is aluminum. I asked if it was a weight thing and he said by the time the steel was prepped and done cost was almost the same, the weight savings were just a bonus.

    Steel has its purpose, rarely is it pleasure craft.
     

  15. Alik
    Joined: Jul 2003
    Posts: 2,966
    Likes: 275, Points: 93, Legacy Rep: 1306
    Location: Thailand

    Alik Senior Member

    Catamaran platform makes sense only if the boat is relatively light. Say, LWL/DISPL^0.33 of demuhull is 6.0 or higher. Otherwise have to use monohull.
    With steel, this parameter can't be achieved on craft below 30m, thus almost no steel multihulls. We did ONE steel powercat 12m in length (preference of Client and shipyard), and we probably won't do it again ;)
     
    Last edited: May 19, 2021
Loading...
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.