Luna Rossa Challenge. AC 36

[uflux]

Have we seen this low aspect ratio jib on LR before?

 

[Priscilla]

Have we seen this low aspect ratio jib on LR before?

View attachment 412238

Four fifths of fuck all breeze and fanging it with a storm jib pretty impressive.

 

[barfy]

I think this is the video that compliments that shot. Some nice light air,.almost perfect manoeuvres...

 

[nav]

 

[Horn Rock]

Some nice light air,.almost perfect manoeuvres...

They're running those big foils very deep - lots of foil arm in the water to get that nose down for end-plating. Is that going to be fast? I'm not sure. Their manoeuvers do look good though.

 

[Zaal]

Vittorio and Pietro noted something about LR grinders. Since the coffee grinders are less efficient when the knobs are both in the vertical position, and most efficient when they are both horizontal, LR grinders are put in a way that when one grinder is in the least efficient grinding position the one in front of him is in the best grinding position. This maximize the power output The grinding machines are probably not perfectly one in front of the other but lightly staggered, so the grinders can stay closer, without crashing their heads. Ineos solution is similar, the grinders are side by side, looking outside the boat, and maybe it's even better because all the grinders are grinding forward (sorry for the repetitions). They still don't know about AM, while it's probably difficult for ETNZ to adopt this solution, since there's probably not enough space in their pods. 

 

[Xlot]

? If you want to endplate the rig, especially the luff where the lift happens, then given the AWA it seems intuitive to water-endplate forward. Aft of that could cost more in weight and drag than necessary. 
 

Have we seen this low aspect ratio jib on LR before?

View attachment 412238

Yet another unqualified comment, but the picture sort of confirms my “feeling” that the funny jib - like a slat - essentially serves to organize airflow to the main, that’s where the heavy work / pressure differential / bypass vortices should take place. Ergo, why does LR keep the seal forward?

 

[The_Alchemist]

6 hours ago, barfy said:

I think this is the video that compliments that shot. Some nice light air,.almost perfect manoeuvres...

LR still has one crew member still changing side behind the sail, I thought they all stay on their side.

 

[Raptorsailor]

Yet another unqualified comment, but the picture sort of confirms my “feeling” that the funny jib - like a slat - essentially serves to organize airflow to the main, that’s where the heavy work / pressure differential / bypass vortices should take place. Ergo, why does LR keep the seal forward?

That’s kind of te job of the jib mate. Jibs make very little power compared to the main as anyone who has ever sailed jib only will know. They act as over sized slats and make the main quite a bit more efficient. Also the jib has a problem if it’s creating vortices.

I guess you could have extended battens creating small vortices in the same way the Harrier has vortex generators on its leading edge. (OD mast means you cant add aero fuckery to the mast afaik) but how you would make sure the vortices stay on the right side and swap sides properly without creating the opposite effect seems difficult. 

But what do I know I’m not an AC aerodynamicist. 

 

[Zaal]

 

[jaysper]

New to me, from https://us.whales.org/whales-dolphins/facts-about-orcas/


How do orcas sleep?


Orcas sleep in a very different way to humans. We have a breathing reflex and when we sleep or become unconscious, we continue to breath automatically. Orcas cannot sleep in this way, they have to remain conscious, even when they are sleeping! This is because their breathing is not automatic - they have to actively decide when to breath, and so they must be conscious even when sleeping. If like us, orcas went into a deep unconscious sleep, they would stop breathing and suffocate or drown.

To get around this, orcas only allow one half of their brains to sleep at a time; the other half stays alert enabling them to continue breathing whilst looking out for dangers in the environment. They only close one eye when they sleep; the left eye will be closed when the right half of the brain sleeps, and vice versa. This type of sleep is known as unihemispheric sleep as only one brain hemisphere sleeps at a time. Orcas periodically alternate which side is sleeping so that they can get the rest they need without ever losing consciousness. When sleeping, orcas swim very slowly and steadily, close to the surface.

A bit like most Anarchists who only turn on half their brain at a time

 

[17mika]

LR still has one crew member still changing side behind the sail, I thought they all stay on their side.

Pietro SIbello, the mainsail trimmer, moves to windward after most manouvres.

 

[Zaal]

English version 

 

[Sailbydate]

1 hour ago, Zaal said:

Interesting. So, how much more output can two grinders make on a pedestal, with one starting at TDC and the other at 90 degrees?

 

[fish7yu]

 

[fish7yu]

 

[fish7yu]

 

[crashtack]

Rewatching the 2000 LV cup that the AC channel just put up on youtube, am I the only one who misses the IACC nationality reqs? As convenient as it is to hear every skipper talking in English, the different languages onboard back then really made it feel like an international sporting event of nations against nations, not just a scrap for the title of best aussie/kiwi former dinghy olympian.

 

[Kiwing]

There is lots to like about one design regattas, especially nation against nation.

But I love these flying machines and I love dreaming of the trickle down benefits as well.

 

[fish7yu]