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Mike Kajan Yacht Designs

Discussion in 'Yacht Renderings & Plans' started by Kajan, Nov 28, 2009.

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  1. Kajan, Dec 18, 2009
    #41
    Kajan

    Kajan Senior Member

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    I'm sure there are several methods of breaking ice but one common way of doing it, is for the ship to slide on top and break it as she goes. The shape of the bow will make it a little bit easier. As a complement, many ice breakers use compressed air, making air bubbles that weaken the ice.
  2. Henning, Dec 18, 2009
    #42
    Henning

    Henning Senior Member

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    Which is why I asked if she was an icebreaker. Commonly there is also an ice blade below the water line to create the initial shatter cracks which gro as the vessel pushes up, and a forward pointing thruster to push the broken ice to the sides. The problem with icebreakers as yachts though is the cost in efficiency. What some of the commercial vessels that operate in the arctic regions are doing now is going with an efficient bulbous bow for running in normal conditions, and an ice breaker bow design at the transom and an azimuthing drive. When they get into ice beyond what would be wise with a bulbous bow, they turn around and operate the other direction.
  3. Kajan, Dec 18, 2009
    #43
    Kajan

    Kajan Senior Member

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    Yes, in that case she is an icebreaker to a higher degree than a cost efficient yacht.
    Cool with the “two-way” icebreaker, never heard of it.
  4. Henning, Dec 18, 2009
    #44
    Henning

    Henning Senior Member

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    Oh yeah, no external stabilizers on an ice boat, think Flume Tanks and pumped/blown liquid ballast systems. Rolls Royce has a nice one as well as retractable blades.
  5. Kajan, Dec 18, 2009
    #45
    Kajan

    Kajan Senior Member

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    Cost saving times

    Henning, this one's for you, "Big Blue", Merry Christmas!

    Ps. Give me a call if you need any ice breaking;)

    Cheers!
    Mike

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  6. Kajan, Dec 18, 2009
    #46
    Kajan

    Kajan Senior Member

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    stabilizers

    Wouldn't dream of external stabilizers on an ice boat.
    Hope you're not referring to "Shangrila" as an ice boat.
  7. Kajan, Dec 18, 2009
    #47
    Kajan

    Kajan Senior Member

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    Mixup

    Henning, my bad! For a moment I thought you meant "Moby" and I couldn't figure out if you missed the top post on p3, where I explain the design.
    As for "Willy" no, she's definitely not an icebreaker. The bow out of the water is a design element borrowed from Wally Power 118, hence the heading.
  8. Henning, Dec 18, 2009
    #48
    Henning

    Henning Senior Member

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    The Wally Power is a planing hull boat, it can use that bow to advantage. I would hope that your 200M is a displacement hull. That bow form on a displacement hull is a serious handicap. It's used on Icebreakers because it allows them to do their job of breaking ice more efficiently, but at the cost of open water cruise efficiency because they have to. Hence the hybrid bow/stern designs.
  9. Kajan, Dec 18, 2009
    #49
    Kajan

    Kajan Senior Member

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    Recap

    Did I miss any way of altering the bow and stern? :)

    The ice yacht "Moby" has the same hull and superstructure as the other designs but slightly altered by adding a level to the hull and compressing and moving the superstructure forward a bit to allow for the heliport aft.

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  10. Kajan, Dec 18, 2009
    #50
    Kajan

    Kajan Senior Member

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    Planing hull?

    I guess anything is possible ;)

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  11. Surfer, Dec 19, 2009
    #51
    Surfer

    Surfer New Member

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  12. Kajan, Dec 19, 2009
    #52
    Kajan

    Kajan Senior Member

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  13. Kajan, Dec 19, 2009
    #53
    Kajan

    Kajan Senior Member

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    No need for a shadow boat?

    I understand that you're not allowed to land or take off with a helicopter while in certain harbors hence the need for a shadow boat among other things of course. I figured with a 200m yacht the need for tender space and such on a shadow boat are of minor importance so I'm thinking of a floating platform, deployable from either side measuring some 25x25m with water ballast tanks and whatever it would take to keep the platform steady while in operation.
    The platform could easily be driven out of harm’s way to safely take care of your helicopter business. Have this been tried before or is it even possible?

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  14. Henning, Dec 19, 2009
    #54
    Henning

    Henning Senior Member

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    It's not impossible, but it is highly impractical. It would have to be a semisubmersion evolution at the stern to launch and recover.
  15. Kajan, Dec 19, 2009
    #55
    Kajan

    Kajan Senior Member

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    Darn, I would've preferred to have the Far84 solution with beach and club at the stern, back to the drawing board I guess...
  16. Kajan, Dec 19, 2009
    #56
    Kajan

    Kajan Senior Member

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    Stern solution

    I guess this is the way to go then.

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  17. Henning, Dec 19, 2009
    #57
    Henning

    Henning Senior Member

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    That would be the best. Cradled in retractable arms for normal ops and then you can have the arms linkaged so at the end it drops it into the water for towed ops. Remember to make the barge a hydrodynamic shape for towing. Actually, might as well make it a catamaran, plenty of bouyancy and stability.
  18. Kajan, Dec 22, 2009
    #58
    Kajan

    Kajan Senior Member

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    Oval master's stateroom in the sky

    "Best place in town"?

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  19. Yacht News, Dec 22, 2009
    #59
    Yacht News

    Yacht News YF News Editor

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    A near vertical bow profile with a bulbous bow?
  20. Kajan, Dec 22, 2009
    #60
    Kajan

    Kajan Senior Member

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    I'm not a NA but why not?
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