Recon diary

[Stingray~]

What prevents a team from testing foil sections and flaps on, say, an F50?

 

[Jethrow]

What prevents a team from testing foil sections and flaps on, say, an F50?

The rules!

 

[Stingray~]

The rules!

Am sure! But there was something in there about recognized classes being excluded?

An F50 or similar would have similar width between the main foils, to make that platform a potentially good tester.

 

[MrBump]

And the sail GP boats are potentially shifting to T foils alsoso there may be some crossover technology benefits resulting

 

[Liquid]

What prevents a team from testing foil sections and flaps on, say, an F50?

Really?

Did you miss the purple button?

 

[enigmatically2]

Is there any way we can tell (in displacement mode) whether they have added weight to make her true AC75 model once up on foils while towing?

Not without a lot more information than we have I suspect

 

[enigmatically2]

What prevents a team from testing foil sections and flaps on, say, an F50?

TR 11.92
"excluding yachts of classes existing on 17th March 2021, providing they are used only with their
standard equipment for participation in and preparation for their in‐class racing."

And you certainly can't change the foils on an F50 and stay in class.

 

[enigmatically2]

Is there any way we can tell (in displacement mode) whether they have added weight to make her true AC75 model once up on foils while towing?

Having said no, I suppose it is just about possible, but only if we could get good estimates of length, width and depth of submerged volume. Length should be possible if we get a good broadside view, because we know the boat length. Depth might be estimable, width less so.

Plus it almost certainly won't be a nice simple shape displaced. So probably know unless some has any bright ideas?

 

[Kiwing]

Having thought about it more, surely it will be AC75 weight because that would produce much more useful data?

 

[Stingray~]

Having thought about it more, surely it will be AC75 weight because that would produce much more useful data?

It's a fun and interesting idea.

Back when ETNZ put a gantry on an AC45-based development boat, to better simulate an AC50 for Bermuda, it was a 'rule-breaker' but a smart one. In that case, they were able to separate the rudder foil and main foils to mimic the AC50, but we have not seen an attempt at this part of it with the 2 L's launched so far; perhaps there is a weight thing going on though.

 

[accnick]

It's a fun and interesting idea.

Back when ETNZ put a gantry on an AC45-based development boat, to better simulate an AC50 for Bermuda, it was a 'rule-breaker' but a smart one. In that case, they were able to separate the rudder foil and main foils to mimic the AC50, but we have not seen an attempt at this part of it with the 2 L's launched so far; perhaps there is a weight thing going on though.

Look at the definition of the LEQ12 to understand why you haven't seen it:

11.92 LEQ12 yacht
Any sailing yacht (or platform towed to simulate a sailing yacht) including an AC40 Class Yacht, that
exceeds 6 m LOA, is less than or equal to 12 m LOA (including all fittings when sailing such as rudder
struts and bowsprits, but excluding instrumentation and structure required only to support that
instrumentation) and that is capable of producing meaningful design or performance information
for use either directly or indirectly in the design, construction or sailing of an AC75 Class Yacht,
excluding yachts of classes existing on 17th March 2021, providing they are used only with their
standard equipment for participation in and preparation for their in‐class racing.

 

[Stingray~]

Look at the definition of the LEQ12 to understand why you haven't seen it:

11.92 LEQ12 yacht
Any sailing yacht (or platform towed to simulate a sailing yacht) including an AC40 Class Yacht, that
exceeds 6 m LOA, is less than or equal to 12 m LOA (including all fittings when sailing such as rudder
struts and bowsprits, but excluding instrumentation and structure required only to support that
instrumentation) and that is capable of producing meaningful design or performance information
for use either directly or indirectly in the design, construction or sailing of an AC75 Class Yacht,
excluding yachts of classes existing on 17th March 2021, providing they are used only with their
standard equipment for participation in and preparation for their in‐class racing.

Thanks.

Does anything prevent them from putting the foils close to 12m apart from each other (how far apart are they on AC75s?) and, as Kiwing for fun suggested, also making it as heavy as an AC75?

 

[enigmatically2]

Thanks.

Does anything prevent them from putting the foils close to 12m apart from each other (how far apart are they on AC75s?) and, as Kiwing for fun suggested, also making it as heavy as an AC75?

No, nothing. The AC 75 foils have to be 10m to 12m forward of the TWP.
But that wouldn't allow the LEQ to have the weight distribution that would match the 75.

But it's impossible to know how much they are trying to match the 75s

 

[ChairborneRanger]

Mainsail Sheeting System

features.americascup.com

 

[enigmatically2]

Flashier graphics don't make up for the fact that his analysis is a long way below Mozzy's

 

[chesirecat]

Well earnt Mozzy party time. Maybe not quite up to the level of the 505 parties there in distant years past. Warning; do not crash out on the beach completely plastered below the high water mark.

https://www.sailweb.co.uk/2022/11/15/rs-end-of-season-championships-2022-hawaii-weekend-results/

 

[ChairborneRanger]

d

Flashier graphics don't make up for the fact that his analysis is a long way below Mozzy's

different audiences, i don't think 18mins of mozzy in a jumper is what the general fan wants to watch. The die-hards like us, sure.

 

[fish7yu]

ETNZ testing new foil.

 

[Liquid]

What is learned about a new test foil from that video?

Foiling boat foils
See boat foil

It's like watching a plane fly by...

 

[enigmatically2]

Well they have data from it. But for us, I agree its useless. Can't even get a good view of what it looks like