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New Age Trawler/Motorsailer; Kite assisted PowerYacht

Discussion in 'General Sailing Discussion' started by brian eiland, Nov 21, 2007.

  1. brian eiland

    brian eiland Senior Member

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    DynaRig Vessel(s)

    Dear HTM09,
    I believe if you visit this subject thread (extensive), you will find a LOT of discussions concerning the DynaRig,....and quite a bit of participation by myself:
    http://www.yachtforums.com/forums/perini-navi-yacht/2487-perini-navi-maltese-falcon%3B-sailing-yacht.html

    I was, and still am, fascinated by this development project that Tom Perkins undertook in a a very bold manner.

    BTW since you seem to be quite interested in this rig technology, here is another discussion thread with lots of pics and subjects (some duplications, but some new)
    Maltese Falcon

    Cheers, Brian
  2. HTMO9

    HTMO9 Senior Member

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    The DynaRig(g)

    The DynaRig was to far ahead of its time at the time of its invention. Only with the developement of new materials like GRP, Aramid fibres and CRP plus the new possibilities of computer added design and computer based mathematics, like finite elemente, it was possible to adapt this type of rig for yachts.

    Legions of aerodynamic scientists have searched for the ideal wing and the perfect airfoil. But mother nature had already invented this ideal airfoil, the eliptic Zenonia plant seed (see picture below). The seed is released by the tree and glides a significant distance before landing. This seed was the model for the DynaRig sail and airfoil.

    The DynaRig combines the advantages of a square rig with the advantages of a schooner or sloop rig. Because of the almost 360 degree free turn angle of the yards combined with the hands off trim and reefing (no crew has to climb the rig, under normal circumstances), both windwards and downwind sailing, the DynaRig is superior.

    But there are big disadvantages also (up to now). A large DynaRig is very expensive and requires high quality materials and manufacturing. There are only a very few naval architects and builder capable of designing and building a large yacht with a DynaRig. And to my knowledge, a high performance DynaRig is very expensive to maintain and to operate. Rumors say, the DynaRig of Maltese Falcon is a sail eater. It means, the wear and tear on DynaRig sails is higher than on conventional rigs. Plus the royals (the upper sails) are designed to sacrifice themself by blowing in case of strong gust, in order to safe the rig.

    But having said all that, watching Maltese Falcon maneuvering under sail is breathtaking. No other type of sailing ship could be handled in this manner. What kind of performance one would see, if MF had a modern hull, made of Alustar. Yaw dropping at least, I would say.

    This is only said for a monohull type ship. A multihull with DynaRig is a different story. A monohull will heel in gusts or windbursts and relieve some of the stress on the rig. The multihull will not and cant do that. That is the reason, why the constuction of rigs for multihulls is a total different story. The beam of a conventionell rigged multihull has only to carry the vertical pressure of the rig, whereas the beam carrying the bearing of a DynaRig mast has to withstand all the possible forces and momentums of this construction. What a challenge for the naval architect, confronted with this task. I would not like to be the victim, who plays the customer, which pays for all this.

    DynaRig on cargo vessels is easier. The rig will be made of high-tensile steel. Weight savings are not of highest priority. The mast can be used as the support for cranes and most important the sails are not the main kind propulsion, they are only used to assist the engine(s).

    TBC

    Attached Files:

  3. brian eiland

    brian eiland Senior Member

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  4. brian eiland

    brian eiland Senior Member

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    Location:
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  5. brian eiland

    brian eiland Senior Member

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    I was looking for my quite extensive subject thread I made on this site, but could find no reference to it now. It did concern itself with kite propulsion, AND it did reference a big 200 foot trimaran motoryacht "White Rabbit" that a very bold yachtsman had built for himself in Asia.

    Just the other day I was looking back thru issues of my BI magazine and discovered a VERY interesting article on a new 276 foot "White Rabbit" tri-hull motor yacht.
    Has anyone seen the latest article on the 276 ft tri-hull motoryacht "White Rabbit" in Boats International mar 2019,....a real eye opener in terms of sea keeping and efficiency.

    This is the same BOLD owner that had the first White Rabbit built. Perhaps I will have the extract a few passages to this article, as it also addresses the MYOPTIC view a great number of non-believers have adopted from early on.

    When I posted my original subject thread I wasn particular drawn to another tri-hull motoryacht by Humpphreys,...

    Design Humphreys: (note:MY FAVORITE)
    This 40m Motoryacht represents a new development in yachting, merging the benefits of a low resistance, fuel-efficient hull form with an unusual propulsive device - a fully automated, self-tending kite.
    PFD Concept

    [​IMG]
  6. brian eiland

    brian eiland Senior Member

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  7. brian eiland

    brian eiland Senior Member

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    I have written an email to the author of that BI article asking his permission to utilize some of his quotes from his article. The opening sentence in his article really caught my attention,...

    I had a feeling this was going to be interesting :cool: