Speed Dream 27 Prototype

Discussion in 'Sailboats' started by Doug Lord, Sep 20, 2011.

  1. DennisRB
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    DennisRB Senior Member

    I agree. When sailed flat the keel will be smashing through wave tops.
     
  2. Doug Lord
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    Doug Lord Flight Ready

    Sd 27

    ===========
    The boat is designed to sail at an angle of heel so that the keel is out. I'm not sure that I think too much of that. In my opinion, an on-deck system with a wing might be better. We'll see. It's a proto and some elements of the design will either prove out or be discarded.
    ====
    Here is a Quant 28DSS video:
    http://www.youtube.com/watch?v=s9ilCx8B0A0&feature=related


    ==================

    And the Speed Dream 27 video(turn sound down!) :

    https://www.youtube.com/watch?v=YchFS5OGTMY
     
  3. NoEyeDeer
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    NoEyeDeer Senior Member

    Well here's another vid of the Quant, going upwind like the SpeedDream, but in less breeze. It looks easily as fast to me.

    http://www.youtube.com/watch?v=AWU0vLE9Drg



    This is why numbers are needed. 45 second clips with no other boats around don't really tell you much.

    ETA: Dunno why the vid isn't showing. BBC tags are ok.
     
  4. DennisRB
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    DennisRB Senior Member

    Exactly. I did think of this boat when Doug asked me, but I thought maybe SD looked s bit faster, but as you say we need some stats.

    Does SD use DSS as well? Seems foils are always going to be faster than lead. But on a large mono lead might be the only option, which is what makes it hard to believe a mono will beat a multi.
     
  5. Doug Lord
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    Doug Lord Flight Ready

    Speed Dream

    ===============
    Vlad was going to use DSS-his early renders show it- but he changed his mind-for the time being. DSS gets more effective as the size of the boat is increased so there is a lot of potential in larger monos-Open 60's(maybe) and much larger......
     
  6. Doug Lord
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    Doug Lord Flight Ready

  7. kach22i
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    kach22i Architect

    Wow, typically when someone proposes a triangular shaped boat in the forum, they get heavily criticized.

    Here is one which works, although at times it looks a bit dicey.

    Very interesting.
     
  8. sean9c
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    sean9c Senior Member

    We looked at conical section shapes many years ago. Interesting when you look at how the centerline shifts to leeward when the boat heels and how that increase righting moment.
    The fact that the triangular shape is also very stable upside down scared us from pursuing it any farther.

     
  9. Doug Lord
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    Doug Lord Flight Ready

    Speed Dream 50

    From Scuttlebutt tonight:

    SpeedDream, the quest to build the world's fastest monohull, has formed two strategic alliances to achieve this ambitious goal. First, recognizing that record setting is as much about radical design ideas as it is about pushing technology barriers, the SpeedDream team have strengthened their technological partnership with the Russian hi-tech giant Yandex and will be utilizing their enormous computing power to further refine the design concept.

    Last October the SpeedDream team launched and tested a 27-foot prototype of what will form the basis of a larger record setter. While continuing to test the first prototype, the SpeedDream team have already started research and development for a second stage 50-footer that will enable them to test their design ideas in real ocean conditions. A core of this program is Computative Fluid Dynamics (CFD) Research and Finite Element Analysis, which will be performed as a cooperative effort between SpeedDream designers and Yandex engineers.
     
  10. Ilan Voyager
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    Ilan Voyager Senior Member

    The triangular shape of the hull is a way to get isocarenes (symetric underwater shapes) while heeling. Jean Louis Noir begin to study that in the seventies and made a boat called Nuits Blanches (sleepless nights) 30 some years ago.

    The videos alone on flat sea show nothing about speed potential. 18.8 knots in 15 knots wind (1.23 times wind speed) -they answered on one video 15 knots witth 12-13 kn wind- is good for a mono but not very impressive. A lot of European lake monos of similar sizes are equal or even faster, and any good 20 feet cat is far better.

    More annoying is the tendency of the bow to go under water while not even having a spi while going rather gently on a mirror sea. That's very disturbing as it means that the position of the lateral wings is maybe too aft or it's attack angle is not good or the profile... Wait and see, there is a long way after these very first trials when they are just discovering the boat, so it's impossible for outside observers to draw conclusions.
    (PS the music of the videos is pure s**t...)
     
  11. Vlad M
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    Vlad M Senior Member

    Why such a sour tone?... So easily annoyed...
    Lighten up guys. We are doing something new and exciting for such a conservative thing as sailing, bringing new, fresh ideas, moving things forward...
    That's OK, our sport needs it. Try to understand and accept - or be left in the wake.
    PS - as for the music - I wonder what kind of s**t you are listening?
     
  12. kach22i
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    kach22i Architect

    Great observations, thank you for sharing them.

    A quick fix could be canard foils to prevent bow ploughing?

    The foils would not be there for lift, but for stabilization and perhaps synced to a ride control system, but that would be cheating, right?
     
  13. daiquiri
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    daiquiri Engineering and Design

    Any news about the project?
    I saw the videos and (no offense or dissing intended) it imo digs the bow too much, even in calm water. Very wet sailing.
    Also, a question about the transverse step below the hull - there is no indication in the videos that it works as it should. Will that idea be dropped or modified in the next versions of the boat?
    Cheers
     
  14. Ilan Voyager
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    Ilan Voyager Senior Member

    Vlad the comment was not sour; I wrote wait and see; it's a proto with lots of things to try. But admit that the bow was going down in very moderate conditions.

    About the s*** music I listen; mainly Baroque and Italian Opera, from Monteverdi to Handel. Countertenors like Jarousski and Scholl. JS Bach, everything composed by him, I love his complexity and humanity.
    Plus the Russian composers from Moussorgsky to Prokofiev, orthodox church choirs and deep bass, the Egyptian diva Oum Kalthoum, Mongolian double voice songs, Pygmy chorals, balafon and Guinean music, Japanese shamisen, Chinese pipa, Bulgarian female chorals, Sufi music, classical Indian music, Pradesh songs, Bebop, Chicago and Mississippi Blues, Appalachian traditional songs, Mexican Huasteco music, Tango, Milonga, Flamenco, Romanian gypsy, Serbian gypsy brass bands, and many others. I was forgetting Philip Glass, Berio, Poulenc and Bartok.
    But please not electronic unimaginative music...the kind of chika, chika, boum, boum.
     

  15. CT 249
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    CT 249 Senior Member

    Your own posts seem to take on a sour tone, Vlad, when you claim that the sport is too conservative and needs change.

    From some viewpoints it's actually very hard to see that sailing is a conservative sport. Comparing it to other sports (air racing, motor racing, cycle racing, athletics, other watercraft sports such as surfing and paddlesports) it seems to have adopted new technology and speed improvements at least as quickly, and offers more avenues for open designs at international level.

    The implication that others don't know why our sport "needs change" is a bit odd - is someone who was not aware that one of the world's fastest singlehanders had adopted spinnakers in a position to assess how much change the sport needs or has had?

    If you don't want people to take a negative tone to your boats, why not stop taking a negative tone to existing boats?
     
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