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Diversity only happens through deliberate action. Without deliberate intent to do otherwise, teams will tend to pick new members who look and think very much like the rest of the team, often explained as "they need to fit in with the team".

Pretty sure Pietro Sibello was hanging onto something at the back of the sail when occasionally looking up the course for breeze in maybe semi–final race 3 vs AM. Maybe it was the leech, but likely they have a handle, even though the helms don't change sides. This guy is hanging onto something...

Yep. LR remains the COR until either it relinquishes the position or the AC match is over. Section 50 of the Protocol sets out how a new CoR is appointed if LR relinquishes the position. LR doesn't need to keep its entire AC team in Auckland if does not become the challenger for the AC match...

Bird feathers don't do 50 kn underwater. And it's a small part of a wing that fits together with its neighbours a bit like roof tiles, so it's shape isn't necessarily the same as the overall wing. B)

Seems that since the backstays must be fitted, someone is trying to see if they can just leave them slack or perhaps tether them out of the way. Similarly if they don't use a code zero (or whatever they're calling the sail set on the bowsprit) then they'd like to remove bobstay. I have no idea...

It's in both real and slow. Looks like they go too high, get some rudder ventilation, stern sinks so bow pitches up, then it settles back without dramas.  

A tip when posting URLs: you can remove the ? and everything after it (the query string).

I think how jobs are distributed depends very much on the team. The winning team will likely keep things much the same if they are happy with how things are. The boat itself is a massive change so keeping the team roles the same might be a very good idea. Of course if a challenger cleans up with...

The Kiwis are probably still trying to work out how the CoR managed to get its name on every boat, while the defender has its name on none.

Didn't the AU F50 have "eagle" mode occasionally when approaching the leeward mark? Both foils down doesn't necessarily mean 50/50 weight distribution, particularly as the AC75s have much better control of lift than the AC72s and 50s. In the case of running very deep downwind, a reason to drop...

Replaceable wing tips. Someone fucked up and left the correct size at home so they went with whatever was in the kit bag…

Yep, it's also not a continuous shot, there's a cut at 1:11. There's also a splash from dropping the starboard foil at about 1:38, so it it must have been raised.

The weird thing for me is that when the mast breaks, the bow pitches down. There was opinion/speculation that the sails cause a forward rotation pushing the bow down, so the rudder has to have downforce to pull it up again. If that was so, then dropping the rig should cause the bow to go up (no...

Some have argued that the spreaders don't need to swivel as the lengths and angles involved don't require them to. The mast drawing package whether they're supplied or not, I don't think it's public. The rigging at least is supplied: 20.1  A drawing package for the mast will be issued...

And that max beam must be between 4.8 and 5.0 m.

Sorry, I don't see how yaw is related to rudder AoA (essentially rudder strut rake). I'm not saying the rudder is used for downforce, only that the geometry makes it possible, or at the very least doesn't preclude it. I think at least negative AoA is used to control pitch while foiling, but...

All the times? Sounds expensive. :-) The only time I lost a Moth rudder it pitch poled. I never worked out its AoA, I just set it to what seemed best/fastest, which was different depending on conditions. For an asymmetric section AoA is not a good measure of ± lift since different sections...

I think you're right. If the rudder is providing so much lift that a stall (loss of lift) causes that kind of launch, there's something seriously wrong. They're clearly going fairly fast, so why would the rudder stall anyway? I think the sunken stern is a consequence of the launch, no the...

Section 3 provides for tolerances: 3.11 (ii) where decimal places for a unit are not given, the measurement shall be accurate to within 1% of the figure indicated. For example, if a Rule states that a component must weigh 1000 kg, that component must weigh between 990 kg and 1010 kg inclusive...

On how  many AC75s do you think the bob stay breaking, presumably with the code 0 set in strong conditions, would be a non–event?