Thanks a lot Dick, You are right that using a rigid wing sail on a monohull is not adapted for. Probably a thick soft sail could be better. I will consults the suggested documents.
I will also consult here in the forum the 3d on the subject.
Cheers
ClaudioD
Brian, I made a simple calculation assuming the use of balsa of 3mm before sanding and then covered with 2 x 50g/m² glass outside and 80g/m² glass inside. This will produce a very rigid hull since it is a solid sandwich, but not free of charge !!!.
About the expected weight for an hull surface of 23.4dm²
Balsa 4.7g x 23.4 = 109.98g
Added weight due to resin impregnation of balsa ~+25% = 27.49g
2 x 0.5g/dm² + 1g/dm² resin x 23.4dm² = 46.80g
1x 0.8g/dm² + 0.8g/dm² resin x 23.4 = 37.44g
Total weight : 109.98 + 27.49 + 46.80 + 37.44 = 221.71g
Thus in theory the balsa/epoxy/glass hull should weight ~225g.
Practically you may expect weight increase due to balsa impregnation . Balsa impregnation is mandatory anyhow for correct epoxy/glass adherence. Assume 250g at the end, the over weight will be of about 100g, therefore consuming all the initial margin, in exchange you will get a very rigid body !!
All in, you can play the game, do not forget that 1mm variation at LWL is ~82g and the bulb can be reduced also in spite of loosing righting moment.
Cheers
ClaudioD
Hi Brian, understand the time consuming “female mold making” however you will be making a male mold anyway, rather than sandwiching the blasa male mold, why not “just wax the male mold” and hand-lay FBG off of it, would save lot of critical weight.
Cheers Alan
You get the description and results of direct lamination of the AC100 from this page : http://www.rcsailing.net/forum1/showthread.php?5879-Ac100/page5 start from post 47 onward.
This the way I made my first AC100 shown here
cheers
Claudio
The 31st announcement date has come and gone, now we have to wait until the 13th September…
Just like I predicted - the protocol and the class rule are going to be announced at the same time along with a few other pieces of the jigsaw.
Cheers, Jim
YES YES, thank you…I realized last night that I could do that! Just make a FRP layup from my male mold. 
Thank you and I look forward to being part of the AC100 gang!
Brian
What the hell happened to this thread? It appears as if it’s been hijacked about post 22-23 and turned into a discussion by Claudio on rc design. Would it not be a good thing if the moderator asked the offenders to keep on track or start a new thread?
eh right you are TF … I’m one of the moderators (rookie still on trainer wheels) … and was one of the off topic collaborators :scared: I will have a chat with myself to ensure it does not happen again. :trouble:
In case you missed it …The official 34th AC announcement is scheduled for 13th September.
Cheers K1
Oh, Oh, mea culpa, I will not do it again, I promise !!!
By the way what about the new AC34 monohull shape ?..
ClaudioD
Rumors that back up what I was saying about the decision being taken months ago are surfacing.
2 yachts are said to be under construction in the Oracle facility in NZ… No surprise here… 70’ cats with soft sails.
If the rumor is correct - They were started 2 months ago…
What happened to the ‘fair deal for all’ that Oracle preached about?
Definitively will be catamarans of 45’ and 72’
Adieu ! the real America Cup !!!
All is here : http://www.cupinfo.com/en/ggyccnr34-multihull-2013-americas-cup-transformed-details-10035.php
ClaudioD
In releasing the Protocol, the Defender has forfeited some of the rights traditionally enjoyed by the holder of the trophy in the interest of making the competition more balanced and fair. Majority approval of the competitors is required to amend the Protocol.
Big deal, after all this time they need to get on with it, my only point was that they have taken a route that they have significant R & D advantage. Which is fair? How? Or are they going to let all the challengers have an equal access to all their data? Yeah right.
From my old 33rd Cup team - Sir Keith Mills added:
“Larry Ellison and Russell Coutts promised Challengers:
- A level playing field – giving teams a fair chance of winning
- Neutral event management – to ensure the event was not controlled by one team
- Cost containment – to prevent an arms race
We now need to study the new Protocol document and determine whether it matches these promises.
TEAMORIGIN will only challenge if the 34th America’s Cup is fair and neutrally managed. “
So, someone else isn’t 100% convinced either!
I do not see where are the economies, 2 hulls instead of one, one rigid sail instead of a soft one, plus the genoas and gennakers.
ClaudioD
Claudio -
the 45 footer is a development, ONE-DESIGN class to encourgae/train new youth skippers for future events. In an effort to develop the next generation of best sailors, the new AC45 will be used for the Youth America’s Cup beginning in 2012, a new initiative to provide young sailors a pathway to the America’s Cup.
The 70+ foot cats are what will race, and BMWO has built both sizes as a demo project to show what they intend to present as part of the protocol … as outlined in your previously posted link to the AC pages.
Two boats, two sizes for two different programs.
Dick
ADDED: "I think that we need to acknowledge that the Defender has kept its word. The America’s Cup is going to have fair rules and a truly independent management of the racing,” said Vincenzo Onorato, President of Mascalzone Latino
"Majority approval of the competitors is required to amend the Protocol. "
Seems like there are really efforts being made to be inclusive - unlike the last challenge where the defender wanted it only “one way” - or so it seemed.
Well, the next America’s Cup will be in 2013 and will use winged catamarans…
http://news.bbc.co.uk/sport1/hi/other_sports/sailing/8994297.stm
Ray
LOL Claudio, You are SPOT ON mate!
Not to mention all the R & D and design and testing @ mega bucks per hour… Starting from scratch costs big bucks to get somewhere close to Oracle.
Their Tri cost upwards of €20,000000 BEFORE they cut it up at least twice, built 3 rigs and 1 Wing.
The only savings are kicking off 6 “Rock stars” off the boat, and at a minimum of €100,000 per year + You will probably only need 1 sailing crew of 11 instead of 2 crews of 17… That soon mounts up.
What ever you try and do the quantities of money involved are of epic proportions, and you can’t do much to change that.
Fairness can be controlled, and sure there is an independent governing body in charge now, but it does not change the facts that the cards have been healthily stacked already by going down this route, not that much different to what the Swiss did really.
This Cup is almost becoming a running joke after the rule was postponed and another potential challenger says no.
That takes the total to four dropouts.
The only guys committed and with enough money at this moment in time are the Swedes. Rumour has it that even the challenger of record, Mascalzone will find it very difficult to stump up the cash too. What spin are they going to put on it now to make this more appealing? We are waiting to find out.
Some interesting info that I have heard lately…
Based on early calculations, the cheapest competitive budget possible is €75 million. That’s because you have to buy 2 of those Coutts cats, then build 2 72’ cats and wings for all of them, to be taken seriously.
Then cart everything around to all the various events that you HAVE to go to. Fail to participate in one and you are out. Full stop.
A 72’ wing alone can cost €2 million. That’s half the cost to build Ericsson 4!
I wasn’t exaggerating when I said it’s going to be an expensive Cup.
So know anyone with some deep pockets?.. I want some teams to play against…!
This Cup is almost become a running joke after the rule was postponed and another potential challenger says no.
That takes the total to four dropouts.
The only guys committed and with enough money at this moment in time are the Swedes. Rumour has it that even the challenger of record, Mascalzone will find it very difficult to stump up the cash too. What spin are they going to put on it now to make this more appealing? We are waiting to find out.
Some interesting info that I have heard lately…
Based on early calculations, the cheapest competitive budget possible is €75 million. That’s because you have to buy 2 of those Coutts cats, then build 2 72’ cats and wings for all of them, to be taken seriously.
Then cart everything around to all the various events that you HAVE to go to. Fail to participate in one and you are out. Full stop.
A 72’ wing alone can cost €2 million. That’s half the cost to build Ericsson 4!
I wasn’t exaggerating when I said it’s going to be an expensive Cup.
So know anyone with some deep pockets?.. I want some teams to play against…!