AC40

[The_Alchemist]

Or the more accurate way. "We struggled to get funding, so we can't afford to develop our own LEQ12, even though the same struggles mean we wee last to enter so are at the bottom of the list. Which means we will need a second AC40 to at least test some foils"

Being real creative are you?

AM didn't struggle to find funding, they struggled to get the NYYC sponsorship. They also waiting on some clarification of the rules and where the race was going to be sailed before they entered (Fake AC - two boat race, etc.).

This put them down at the bottom of the list.

Money has never been a problem with AM. They were the first to launch a mule and the AC75's. They hired Tom Slingsby. They do not have a commercial sponsor in the team name. Bought two overpriced AC40's for internal match racing.

 

[The_Alchemist]

Don't suppose the rumour says what the quoted/indicative/promised dates are for each of those deliveries?

Back on page 10 (post 187) is when we deciphered this info.

 

[enigmatically2]

Back on page 10 (post 187) is when we deciphered this info.

But if that were correct then 5 would have been delivered by now. Whereas I thought only 2 had

 

[Stingray~]

Don't suppose the rumour says what the quoted/indicative/promised dates are for each of those deliveries?

Nope, was given no delivery dates. They did slide a little already in the mean time, may do so again for a few of them with the redesign.

 

[Stingray~]

Back on page 10 (post 187) is when we deciphered this info.

A link to that post

AC40

No worries, they will be used for Grant's AC40 Circus. No, seriously... , could well be... Doubt it! Grant is already struggling to attract Sponsors and he doesn't have a Billionaire like Larry Ellison. While Matteo de Nora is no doubt very wealthy he isn't as rich that he could pull an AC40...

forums.sailinganarchy.com

 

[Stingray~]

I'm pretty sure INEOS are getting two AC40s so this list may not be totally accurate

While that is certainly possible, the original piece at McConaghy said AC teams had ordered 8, matching the number above.

There are currently eight AC40’s under construction at McConaghy, with America’s Cup teams lined up awaiting possession. These AC40s will be used by the Challenging teams for testing, development, Match Race training and preliminary events, and competed in for the Youth and Women’s America’s Cups.

AC40 - McConaghy Boats

@[email protected][email protected] AC40 hull shape is based on that

mcconaghyboats.com

 

[The_Alchemist]

But if that were correct then 5 would have been delivered by now. Whereas I thought only 2 had

Those are estimated completion dates. Shipping to the teams takes more time.

 

[Stingray~]

Posted yet? Pretty good

 

[Forourselves]

AC40: IMPLEMENTING THE SOLUTION

Just days ago, Emirates Team New Zealand buried the bow of their AC40 while testing in waves on Auckland’s Hauraki Gulf, which resulted in damage to the forward sections of the hull and deck structure. While the on-water team was recovering the yacht and returning to dock, the team’s engineers...

emirates-team-new-zealand.americascup.com

 

[Forourselves]

3 boats delivered so far, no change to the current delivery schedule. Nothing to see here folks.

 

[Sailbydate]

The fix.

 

[buckdouger]

The fix.

View attachment 555693

That's not going to fit through the bulkhead hatch presumably, curious how invasive installing it will be.

 

[enigmatically2]

That's not going to fit through the bulkhead hatch presumably, curious how invasive installing it will be.

Not a problem for the NZ boat.

 

[buckdouger]

Not a problem for the NZ boat.

Indeed!

 

[Varan]

The figures above compare the longitudinal and lateral decelerations from the AC40 crash against the largest event seen by Te Rehutai, the team's AC75 from the last America's Cup.

Not only did we see longitudinal decelerations 70% higher than the previous worst-case, but this was coupled with a simultaneous lateral loading of similar magnitude - the yacht came to a complete stop and yawed 90 degrees in just over a second. We believe it was this combined load state that led to an initial failure of the foredeck sandwich panel. The damage we saw in the hull and partial detachment of the bow structure is likely a consequence of the compromised deck panel, rather than a root cause.

Sail-World

Edit: They also noted that there would be no change to the delivery schedule of new AC40s and that retro kits for existing ones will be available soon.

 

[enigmatically2]

Question remains as to why the loadings were higher. The lateral loadings I can see as bad luck/exceptional case, but why are the longitudinal stresses 70% higher. The boat wasn't going faster. So it seems likely the deceleration was at least partially worse due to the hull shape. Which seems like a missed factor in the design

 

[Stingray~]

Question remains as to why the loadings were higher. The lateral loadings see as bad luck/exceptional case, but why are the longitudinal stresses 70% higher. The boat wasn't going faster. So it seems likely the deceleration was at least partially worse due to the hull shape. Which seems like a missed factor in the design

Yes, the bows are quite different. It must surely affect the deceleration.

Alinghi took what looked like a bad dive recently and apparently came out unscathed too.

 

[david r]

The bow shape wouldn't mater if they could keep the rudder foil from breaking loose. Maybe having 2 rudders like on the foiling cats is actually a good thing in spite of adding a bit of drag. Plus they gain RM using rudder differential on the windward rudder on the cats.
This whole idea of making a trimaran without the amas might not be such a great idea...

 

[Sailbydate]

The bow shape wouldn't mater if they could keep the rudder foil from breaking loose. Maybe having 2 rudders like on the foiling cats is actually a good thing in spite of adding a bit of drag. Plus they gain RM using rudder differential on the windward rudder on the cats.
This whole idea of making a trimaran without the amas might not be such a great idea...

Indeed. It's not like multi-hulls have ever had any design structural problems, right?

 

[breezie]

That's not going to fit through the bulkhead hatch presumably, curious how invasive installing it will be.

the ring frame will be in two parts IMNSHO , the hardest part will be getting it to fit nicely In the boat they have bent.