34th America's Cup: multihulls!

[Gary Baigent]

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.

 

[Doug Lord]

AC 34 on Foils!

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

click-

 

[Silver Raven]

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With the main foil's angle of incidence being controlled manually(if at all) and the rudder foil fixed, pitch control will be good. They aren't allowed to use the windward foil to pull down and create more RM.

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

 

[Doug Lord]

34th AC

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

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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.

 

[Silver Raven]

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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.

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

 

[gypsy28]

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

DAVE

 

[Cataphract]

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

DAVE

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...

 

[Doug Lord]

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

DAVE

=========================
One of the videos here shows one of the guys saying they were doing close to 40 knots in a 20 knot wind.....

 

[Silver Raven]

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...

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

 

[warwick]

Thanks Doug for the photos.

The photo of Team Oracle sailing will clear up the earlier forward structure/ a frame a bit more.

 

[Doug Lord]

34th AC on Foils!

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.

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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.

 

[Doug Lord]

34th AC on Foils!

Here is Oracles first sail. Too bad they ,apparently, broke a board. Maybe someone can call the Kiwis and get it right? Couldn't help myself-the sight of Team NZ fully flying is just too much. Oracle will come along.....

http://www.youtube.com/watch?v=Sr055W97l4o&feature=player_embedded

 

[gypsy28]

Oracles "tillers" look kinda unique

 

[yves]

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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.

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 ?

 

[gypsy28]

no vid of ETNZ on its foil yet ?

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