myiW Current Conditions and Forecasts Community Forums Windsurfing Videos Buy and Sell Services
 
Hi guest · myAccount · Log in
 SearchSearch   ProfileProfile   Log in to check your private messagesLog in to check your private messages   RegisterRegister 
America's Cup
Goto page Previous  1, 2, 3, 4, 5  Next
 
Post new topic   Reply to topic    iWindsurf Community Forum Index -> Southwest USA, Hawaii, Mexico
View previous topic :: View next topic  
Author Message
zirtaeb



Joined: 03 Jul 2009
Posts: 2402

PostPosted: Tue Aug 28, 2012 2:55 pm    Post subject: Reply with quote

Race cars and motorcycles have fairings and wings to counter exactly that problem.
Don't Aussie18's have wings on the bow?
Back to top
View user's profile Send private message
mac



Joined: 07 Mar 1999
Posts: 5346

PostPosted: Tue Aug 28, 2012 3:34 pm    Post subject: Reply with quote

John Craig (race director) argued that the 72 foot length of the hulls for next year would be long enough that the voodoo chop at Crissy would not affect them. But he also thought that the 45's would be long enough. From sailing a formula board in voodoo enough chop I know that having a wide front end slap down also causes problems. You don't fully bury the nose if you're sailing right, but a big slap will slow you down enough to throw you off the front. Let's see what adjustments they make with the 72's.
Back to top
View user's profile Send private message
hemmy007



Joined: 10 May 2002
Posts: 97

PostPosted: Tue Aug 28, 2012 3:42 pm    Post subject: Reply with quote

mac wrote:
John Craig (race director) argued that the 72 foot length of the hulls for next year would be long enough that the voodoo chop at Crissy would not affect them. But he also thought that the 45's would be long enough.



Looking forward to seeing the photos
soon that will refute this point.

Ouch, 72's on the pitch-pole-roll !
Back to top
View user's profile Send private message
89Spring



Joined: 24 Jul 2003
Posts: 235

PostPosted: Tue Aug 28, 2012 4:01 pm    Post subject: Reply with quote

Any type of spoiler is going to add drag and slow the boat down. The bear away through the death zone is where and when it is an issue. Any time guys or drivers or who ever is pushing the particular medium to the limit there will be crashes. F1 cars have wings to give down force do you those wings now stop the car from a yard sale? Nope it just turns into a bigger yard sale because the added down force now let's the car get to a higher speed. The reverse sheer bows are not going to stop a pitchole just let the boat get to a higher speed before pitchpole. The 45s have already flipped over a few times.
The 72s are going to be hairball. The down side to the cats is that match racing in the traditional form is not really going to happen. Imagine the dial up when entering the box and each boat is doing 30.

I watched two days of racing from the water. The best spot is at the weather gates. I think it is pretty cool. From there you can see the race course. If you don't have a boat I would go on the rocks east or west of the St.FYC. I think a table at St.FYC was 5k for the day?
Back to top
View user's profile Send private message
andydavis



Joined: 11 Apr 1999
Posts: 268
Location: Point Isabel

PostPosted: Tue Aug 28, 2012 4:51 pm    Post subject: Reply with quote

tony wrote:
The bow design is a compromise that improves speed when the boat is sailed as intended...


Of course, you can believe whatever you wish, although I don't think there's any evidence that this bow shape does anything to improve speed.

With regards to an additional foil at the bow to provide a counter acting pitching moment, that is clearly possible; however, this is a one design, not a development class. The AC 72 is more of a development class, with the number of appendages limited.
Back to top
View user's profile Send private message Visit poster's website
zirtaeb



Joined: 03 Jul 2009
Posts: 2402

PostPosted: Tue Aug 28, 2012 6:06 pm    Post subject: Reply with quote

So maybe they'll come up with a quick release mainsheet, and jibsheeter.
Dump the power ASAP the bow starts to plow. Those tall masts don't lend to forgiveness, nore does the narrow noses which normally lie very close to the water at speed.
Back to top
View user's profile Send private message
SPQR



Joined: 18 May 2004
Posts: 214

PostPosted: Tue Aug 28, 2012 10:30 pm    Post subject: Reply with quote

So maybe a dumb question, I haven't followed the AC stuff, I went to Kauai instead. That said, reading through this the AC raced the AC 45's this year for practice (?) and the the real AC next summer with AC 72's?
Back to top
View user's profile Send private message
89Spring



Joined: 24 Jul 2003
Posts: 235

PostPosted: Wed Aug 29, 2012 12:13 am    Post subject: Reply with quote

Pretty much you got it. This is the AC 45 world series. I don't think it has anything to do with the Louis Vuitton series and the actual AC
Back to top
View user's profile Send private message
tony



Joined: 05 May 1994
Posts: 60

PostPosted: Wed Aug 29, 2012 8:30 am    Post subject: Reply with quote

andydavis wrote:
tony wrote:
The bow design is a compromise that improves speed when the boat is sailed as intended...


Of course, you can believe whatever you wish, although I don't think there's any evidence that this bow shape does anything to improve speed.


Maybe not, but apparently you believe it too since in an earlier post you said:

andydavis wrote:
It does have a purpose, principally reducing spray drag at high speeds.
Back to top
View user's profile Send private message
andydavis



Joined: 11 Apr 1999
Posts: 268
Location: Point Isabel

PostPosted: Wed Aug 29, 2012 10:11 am    Post subject: Reply with quote

tony wrote:
andydavis wrote:
tony wrote:
The bow design is a compromise that improves speed when the boat is sailed as intended...


Of course, you can believe whatever you wish, although I don't think there's any evidence that this bow shape does anything to improve speed.


Maybe not, but apparently you believe it too since in an earlier post you said:

andydavis wrote:
It does have a purpose, principally reducing spray drag at high speeds.


yeah, but clearly offset by the speed loss to capsize, or throttling back to avoid it.
Back to top
View user's profile Send private message Visit poster's website
Display posts from previous:   
Post new topic   Reply to topic    iWindsurf Community Forum Index -> Southwest USA, Hawaii, Mexico All times are GMT - 5 Hours
Goto page Previous  1, 2, 3, 4, 5  Next
Page 4 of 5

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You can attach files in this forum
You can download files in this forum

myiW | Weather | Community | Membership | Support | Log in
like us on facebook
© Copyright 1999-2007 WeatherFlow, Inc Contact Us Ad Marketplace

Powered by phpBB © 2001, 2005 phpBB Group