60-seats passenger boats, want top speed of 50knots, any idea

Discussion in 'Boat Design' started by TSD Joshua, Oct 25, 2023.

  1. TSD Joshua
    Joined: Aug 2022
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    Location: China

    TSD Joshua Junior Member

    The client wanted a passenger boat that could carry 60 passengers. Transporting passengers to and from the island. The customer hopes to reach a speed of 50 knots when fully loaded with 60 passengers. The customer hopes to have two toilets on the boat and a fuel tank capacity of 1000-1200L. Use inboard diesel engine. Any ideas?
     
  2. BlueBell
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    BlueBell . . . _ _ _ . . . _ _ _

    Sounds like a hydrofoiling catamaran may work.
    Have you looked at what New Zealand is running for ferries in that range?
     
    Last edited: Oct 25, 2023
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  3. bajansailor
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    Location: Barbados

    bajansailor Marine Surveyor

    How far offshore is this island? Or what is the total distance that the passengers have to be transported?
    What are the typical sea conditions like there?
    50 knots is awfully fast for a commercial passenger ferry, and a fuel tank capacity of 1,000 litres is rather small when feeding two large diesel engines.

    Re @BlueBell suggestion, have a look at the Teknicraft range of fast passenger catamarans -
    Teknicraft Design http://teknicraft.com/work/passenger-vessels/1/34
     
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  4. TSD Joshua
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    TSD Joshua Junior Member

    client is in Maldives. Not so sure about the distance. Thanks for the website.
     
  5. gonzo
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    gonzo Senior Member

    At 50 knots it will need seats with suspension and seatbelts. Otherwise, there will be injuries and deaths. Also, with something moderate like 4000HP the fuel will be enough for maybe one hour.
     
  6. DogCavalry
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    DogCavalry Senior Member

    Yes. The math isn't really working. 1000 liters is unrealistically low, and the speed is dangerously high.

    The water taxi I use to the jobsite had a career ending injury last year, where the cowboy at the helm didn't drive according to conditions, and a passenger ruptured some disks on a landing.
     
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  7. Noah Stone
    Joined: Aug 2023
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    Location: SF Bay Area

    Noah Stone Junior Member

    50 knots is very fast, although this may be possible this will end up being a massively expensive, and time consuming to design and make well, what's your budget?
     
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  8. BlueBell
    Joined: May 2017
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    BlueBell . . . _ _ _ . . . _ _ _

    50 knots + 60 passengers = very expensive
     
  9. myszek
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    myszek Junior Member

    I could imagine rollercoaster-style seats that provide enough safety. But I cannot imagine going to the toilet at speed.

    regards

    krzys
     
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  10. gonzo
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    gonzo Senior Member

    Unless the toilets have seatbelts too :rolleyes:
     
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  11. myszek
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    myszek Junior Member

    But how to get there from your seat?

    OK, now seriously. The only solution I can see for now is to draw the hull entirely out of the water and not to allow it to ever touch a wave.
    So, a hydrofoil with deep T-foils, having automatically adjusted elevators and ailerons. Surface sensors, wave-detecting radars and cameras, and an AI system similar to those used in autonomous cars. Would be a very exciting project, but I bet much more costly than the client can imagine.

    regards

    krzys
     
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  12. gonzo
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    gonzo Senior Member

    I agree about hydrofoils. However, they have a limited operating range on wave height before the hull starts slamming. I have been onboard a foil ferry that hit a log and it was brutal. Everyone got thrown off their seats or fell on deck if standing.
     
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  13. Ad Hoc
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    Ad Hoc Naval Architect

    50 knots...and only 1200l, fat chance.
     
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  14. clmanges
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    clmanges Senior Member

    Air-cushion vehicle? It might give a smoother ride, but I suspect it would have an even higher rate of fuel consumption.
     
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  15. Noah Stone
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    Location: SF Bay Area

    Noah Stone Junior Member

    While hydrofoils present an intriguing solution to many challenges, they also introduce a host of their own issues. Therefore, it may be a good idea to try to get the client to accept a more reasonable speed of 30-40 knots. This approach could prevent the project from significantly exceeding its budget, as similar projects have already been successfully executed. If you can convince your client to lower their speed requirements, I would recommend considering a smaller, lighter single-deck version of the SF Bay ferry. This could potentially meet their needs while also keeping costs under control.
     
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