Short hull trimaran

Discussion in 'Multihulls' started by midlifecrisis, May 12, 2019.

  1. midlifecrisis
    Joined: Feb 2019
    Posts: 12
    Likes: 1, Points: 3
    Location: US

    midlifecrisis Junior Member

    Pittsburg or Italy, gee how could one choose which one to go to? :)

    In terms of batteries, indeed it is wonderful that they are getting cheaper, it enables so much possibilities and I am not against electric, it just has a limited use compared to what might be desired. However an outboard motor seem like an easy way get some higher speed capability for occasion use.
     
  2. BlueBell
    Joined: May 2017
    Posts: 1,342
    Likes: 271, Points: 83
    Location: Victoria BC Canada

    BlueBell Ahhhhh...

    MLC,

    It's been fun watching this evolve.

    IMO, a long, skinny, stabilized monohull with low-volume, skinny pontoons,
    lots of flexible, low weight EV panels,
    and a very small, modern battery might work.
    Single prop, weight down low.

    But the things got to be light and it's a day sailor because the battery has to be so small.

    You know, the efficiency you could get out of a tiny internal combustion engine on a boat like that?
     
  3. BlueBell
    Joined: May 2017
    Posts: 1,342
    Likes: 271, Points: 83
    Location: Victoria BC Canada

    BlueBell Ahhhhh...

    Corley,

    I'd forgotten about this video, thanks.

    Look at the size of that wake!

    A longer, skinnier centre hull with two little outriggers would move faster with a single, centre prop.
     
  4. midlifecrisis
    Joined: Feb 2019
    Posts: 12
    Likes: 1, Points: 3
    Location: US

    midlifecrisis Junior Member

    I don't have much feel for the efficiencies of small motors, mostly I worry about their reliability.

    I debated if multihulls were efficient because they allowed long hulls, or because they allowed light weight vessels.
    The benefit of a catamaran is also it down side all that lovely area, that you might wind up placing mass on top of.
     
  5. SolGato
    Joined: May 2019
    Posts: 32
    Likes: 13, Points: 8
    Location: Kauai

    SolGato Junior Member

    The size of that wake is pretty crazy!

    Also notice how much water disturbance there is due to the leg of the motors.

    I wonder if using the airfoil shape of the motor legs as an extension of the rear hull ends would have avoided this turbulence. It almost looks like the water is coming back together behind the knife edge of the hull, then being split apart and displaced again by the Torqeedo leg.

    Cool looking concept tho, and quite tall.
     
  6. drivejunk
    Joined: Oct 2016
    Posts: 2
    Likes: 0, Points: 1, Legacy Rep: 10
    Location: NorCal

    drivejunk New Member

     

  7. drivejunk
    Joined: Oct 2016
    Posts: 2
    Likes: 0, Points: 1, Legacy Rep: 10
    Location: NorCal

    drivejunk New Member

    I took a prindle 19 catamaran and put a torqueedo 4kw motor on it with a 4kwh lithium battery. At 4kw, and one person on board I could do 11-12kts. With 4 people I could do maybe 9 or 10. I had 800 watts of solar on an awning, and I seem to remember I could make 5 or 6kts on 800 watts or so. Do the arithmetic to get range, I get 11 nautical miles at full speed, maybe 36 on a sunny without using the battery, more range and more speed using both.
    I have gotten that boat to go 20kts with sail, so the kw output of the sail is considerably more than 4kw :)
     
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