34th America's Cup: multihulls!

Discussion in 'Multihulls' started by Doug Lord, Sep 13, 2010.

  1. Gary Baigent
    Joined: Jul 2005
    Posts: 3,009
    Likes: 127, Points: 63, Legacy Rep: 509
    Location: auckland nz

    Gary Baigent Senior Member

    Fargo truck!!
    Look Doug, no waving wands or other nonsense - and according to Graeme Swan who took this memorable/famous shot, sailing level and smooth as.
     

    Attached Files:

  2. Doug Lord
    Joined: May 2009
    Posts: 16,679
    Likes: 342, Points: 93, Legacy Rep: 1362
    Location: Cocoa, Florida

    Doug Lord Flight Ready

    AC 34 on Foils!

    Bad news from Oracle-they broke the stb daggerboard. More pictures of Team NZ on foils, followed by Oracle:

    click-
     

    Attached Files:

  3. Silver Raven
    Joined: Oct 2011
    Posts: 437
    Likes: 12, Points: 0, Legacy Rep: 67
    Location: Far North Queensland, Australia

    Silver Raven Senior Member

    Gooday all of you; How the heck does anyone 'police' the 'pull-down' effect while they are racing - as I see it - that is not possible unless there is a 'roving' unpire moving all over the deck at all times that each boat is out on the race course. Any idea's there ??? - ciao, james
     
  4. Doug Lord
    Joined: May 2009
    Posts: 16,679
    Likes: 342, Points: 93, Legacy Rep: 1362
    Location: Cocoa, Florida

    Doug Lord Flight Ready

    34th AC

    ==============
    James, if I'm right about the control of the angle of incidence of the main foil by pivoting the thing-they would just set it for neutral-or slight lift to compensate for boat pitch down. I think they have some sort of rule and marks on the foil so that can be verified.
     
  5. Silver Raven
    Joined: Oct 2011
    Posts: 437
    Likes: 12, Points: 0, Legacy Rep: 67
    Location: Far North Queensland, Australia

    Silver Raven Senior Member

    Gooday & thanks Doug - I've been sailing long enough - in some very big races - to know full well - that I could VERY intentionally - get extremely close to the edge - of that rule - to accidently (of course) error - just into the 'pull-down' area - but of course only by pure circumstance (ha ha) & only by pure deed of accidental circumstance gain - how many 100 mtrs/yrds/ft etc down the track. Still don';t see how they can 'police' the 'rule/s' without a very active 'marshall' on board. Not for one moment would I think that anyone would get into a 'grey' area - for something as totally unimportant as the 'AMERICAS CUP' - neva - Gawd - give me a break - there's only several LARGE millions of dollars resting on the outcome of this series. Just me - maybe - ??? - - ciao, james
     
  6. gypsy28
    Joined: Mar 2010
    Posts: 218
    Likes: 25, Points: 28, Legacy Rep: 120
    Location: NSW Australia

    gypsy28 Senior Member

    Have Team NZ released any top speeds theyve reached yet? Were not talking Hydroptere speeds yet are we?

    Is it possible for Team NZ to challenge Hydroptere speeds?

    Pretty amazing seeing a 72ft windsailed cat FLYING :cool:

    DAVE
     
  7. Cataphract
    Joined: Mar 2012
    Posts: 28
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: New York/ Cambridge

    Cataphract Mechanical Engineer

    I've heard it should be able to hit at least 1.2 times the true wind speed going upwind and 1.6 times true wind speed going downwind.
    That certainly sounds believable on these monsters.
    I'm also curious to see how close they get to the speed record held by L'Hydroptere...
     
  8. Doug Lord
    Joined: May 2009
    Posts: 16,679
    Likes: 342, Points: 93, Legacy Rep: 1362
    Location: Cocoa, Florida

    Doug Lord Flight Ready

    =========================
    One of the videos here shows one of the guys saying they were doing close to 40 knots in a 20 knot wind.....
     
  9. Silver Raven
    Joined: Oct 2011
    Posts: 437
    Likes: 12, Points: 0, Legacy Rep: 67
    Location: Far North Queensland, Australia

    Silver Raven Senior Member

    Gopoday 'Cata'. Where did you hear & from whom ??? Something seems a tad odd to me. If you look & listen to all that's been said & filmed about the K1 'toy' in those pics & at that time - your 'heard' figures - don't stand up to reality - as I can see - -

    It's blowing under 20 kts (no white-caps - which is under 14 kts) - the seas are flat as (no waves - that I can see) the 'toy' was getting up towards 40 kts if not faster. Yes/No ???

    14 kts - wind speed times your 1.2 is = 16.8 kts
    20 kts - wind speed times your 1.2 is = 24 kts

    14 kts plus 20 kts divided by 2 = 17 times 2.4 = 40.8 kts of boat speed.

    Guess it's not possible for a - to long - to short - to heavy - to big - to clumsy - to flat sided - to 'agricultural' hulls & wing etc etc bla bla - to do anything like - get a whole 72' wing-masted cat fully air-borne.

    Guess we'll just have to wait for another 100 years or - have another look & believe what we see ??? ciao, james
     
  10. warwick
    Joined: Jan 2012
    Posts: 423
    Likes: 7, Points: 18, Legacy Rep: 63
    Location: papakura south auckland new zealand

    warwick Senior Member

    Thanks Doug for the photos.

    The photo of Team Oracle sailing will clear up the earlier forward structure/ a frame a bit more.
     
  11. Doug Lord
    Joined: May 2009
    Posts: 16,679
    Likes: 342, Points: 93, Legacy Rep: 1362
    Location: Cocoa, Florida

    Doug Lord Flight Ready

    34th AC on Foils!

    ==================
    Ain't it cool! You Kiwis learn after some time goes by: two of Bradfields multifoiler Raves were converted around 2003 to be flown manually-no wands.
    They were raced and beat the wand equipped boats, as I remember it.
    Seriously though even though they have lots of leverage to the top of the board from the lower bearing I'm not sure how they would move this board. Can they use hydraulics? Doesn't have to move much .....
    I'm not sure how they do it but I'm 97.5% sure that they do move it. It's illegal to move the rudder and it wouldn't work so well. All fully submerged foilers, that I am familiar with, control the angle of incidence of the main foil and don't move the rudder foil.
     
  12. Doug Lord
    Joined: May 2009
    Posts: 16,679
    Likes: 342, Points: 93, Legacy Rep: 1362
    Location: Cocoa, Florida

    Doug Lord Flight Ready

  13. gypsy28
    Joined: Mar 2010
    Posts: 218
    Likes: 25, Points: 28, Legacy Rep: 120
    Location: NSW Australia

    gypsy28 Senior Member

    Oracles "tillers" look kinda unique
     
  14. yves
    Joined: Jul 2012
    Posts: 59
    Likes: 1, Points: 8, Legacy Rep: 29
    Location: paris

    yves Junior Member

    Yes but for sure having the angle control on the gaggerboard instead of the rudder will make the overall balance much more sensible (in the sense reactive) to any change, no vid of ETNZ on its foil yet ?
     

  15. gypsy28
    Joined: Mar 2010
    Posts: 218
    Likes: 25, Points: 28, Legacy Rep: 120
    Location: NSW Australia

    gypsy28 Senior Member

    Post #422 has a video of Team NZ almost fully airborn, lee hull is just skimming the surface really (I'd call it foiling) about 1:05 to 1:10

    DAVE
     
Loading...
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.