89er

[JulianB]

What is the logic used to determine the spreader heights? It might be a bit of an illusion in the photo but the lower spreader looks relatively high? I guess the d1s mean it can be set higher?

So now I am going to date myself.
Back in the 80's we had mast that bent around 5-6%, so by that, my 10.7m 89er mast, back in the 80's we would design to bend and operate with 1/2m bend most of the time going up to 640-650mm of bend in a gust and if it went 700mm it would fall down.
This is what my father would have called a active batten rig.
We got very anal about the luff curve, not only the amount but also the position/Type of the curve and we would marry that curve multiplied by a factor in the roach, but modified so we would get the upper quartile the feather off first.
And we developed this spreadsheet that would give us all of these number and it would also spit out spearder poke and toe.
Poke it the distance past a straight line sideway, toe is for-n-aft.
Top spreader is a no brainer, you dial in the type of wire your are using, and from that you work out the effective angle that you need (sideways) and then pitch of the spreader all had to do with expected AWA, and that varied from 22-27°.
But your 100% correct, if you have an effective set of D1's, (which I have) you start your measurment at the top of the D1's.

Today with squarehead, mast bend is 1.5 - 2%, it may get to 3%, you are no were near the critical numbers, so you have to be a idiot for the mast to fall down (or somethng breaks, which proves you were a idiot, because you did not check), plus today you have the Andrew Lectie's of this world who do all of it.

Not sure people will get all of this, but it is critical.

The original 18teen rigs and later the 49er and 29er rigs, and by rigs I mean mast and sails (talking upwind now) were design by me, I dictated luff and leach profiles, areas and I did the mast. Ian (Maka) McDiarmid then worked with me, sure made suggestions, 99% of the time they were incorporated, and we made some truley outstanding rigs, but they were driven by one brain, supported by another, working as a team.

Now you have mast makers who make a mast and then sail-makers who fit a sail to a mast, 99% of the time.

The recent 3Di-ing of 49er/FX has been both painful and iluminating. The mast and sail were developed at different times, by diffrent people on different continents.
It has been painfull, but we have had very supportive sailors, and by garnishing their thoughts and feed back, hopefully, and all indicators suggest this, we have hit the nail on the head!

Longivity of the 3Di jib is presently 3 fold! The mens and womens WC 1st place where acheived with Jibs that had seen serious use. Use that would have rendered previous incarnations of the jibs in the trash can. Mains could well live more than a year.

Mains are interesting, squarehead, stress the sail far less because the mast bends far less. And the Mast is stressed far less because of the Squarehead, it can bends less. WIN - WIN!

But back to it, not quite sure how I engaged Andrew, but speaking to another Taswegen today who commented that Andy was soft, quite, understated but quite extrodinary with what he did.

This was my baby, firstly I was blown away with the amount of data feed back I got, and the freedom with which I got it. A lot of you would have no idea, but I checked and double checked everything I got from Andy against my own data base, and by the time Andy and Tim (Willets - C-Terch) started talking ie's WRT the mast, I had a lot of confidence in what Tim/Andy where proposing.

Back to spreaders.
My stay base is 25° and Andy has set my spreader angle (the same) at 25°.
I probably would have had them further fwd, 22-23° maybe, but it would be more toe than angle, but given that the mast is 112mm for-n-aft and the bend is so much less, all that is going to happen is the D1 tension will be higher.
I may have been more anal about the height, but again, everything is so much simpler with the Squarehead!

Long way to answer a simple queastion!

jB

 

[JulianB]

Just FYI, we pulled the pin on the first sail this morning, it's cold, wet but most seriously, it's blowing 20+ knts even more. Not condusive to shaking down a test sail of a new boat.

But the 49er guys are having fun.

 

[Scillyjosh]

So now I am going to date myself.
Back in the 80's we had mast that bent around 5-6%, so by that, my 10.7m 89er mast, back in the 80's we would design to bend and operate with 1/2m bend most of the time going up to 640-650mm of bend in a gust and if it went 700mm it would fall down.
This is what my father would have called a active batten rig.
We got very anal about the luff curve, not only the amount but also the position/Type of the curve and we would marry that curve multiplied by a factor in the roach, but modified so we would get the upper quartile the feather off first.
And we developed this spreadsheet that would give us all of these number and it would also spit out spearder poke and toe.
Poke it the distance past a straight line sideway, toe is for-n-aft.
Top spreader is a no brainer, you dial in the type of wire your are using, and from that you work out the effective angle that you need (sideways) and then pitch of the spreader all had to do with expected AWA, and that varied from 22-27°.
But your 100% correct, if you have an effective set of D1's, (which I have) you start your measurment at the top of the D1's.

Today with squarehead, mast bend is 1.5 - 2%, it may get to 3%, you are no were near the critical numbers, so you have to be a idiot for the mast to fall down (or somethng breaks, which proves you were a idiot, because you did not check), plus today you have the Andrew Lectie's of this world who do all of it.

Not sure people will get all of this, but it is critical.

The original 18teen rigs and later the 49er and 29er rigs, and by rigs I mean mast and sails (talking upwind now) were design by me, I dictated luff and leach profiles, areas and I did the mast. Ian (Maka) McDiarmid then worked with me, sure made suggestions, 99% of the time they were incorporated, and we made some truley outstanding rigs, but they were driven by one brain, supported by another, working as a team.

Now you have mast makers who make a mast and then sail-makers who fit a sail to a mast, 99% of the time.

The recent 3Di-ing of 49er/FX has been both painful and iluminating. The mast and sail were developed at different times, by diffrent people on different continents.
It has been painfull, but we have had very supportive sailors, and by garnishing their thoughts and feed back, hopefully, and all indicators suggest this, we have hit the nail on the head!

Longivity of the 3Di jib is presently 3 fold! The mens and womens WC 1st place where acheived with Jibs that had seen serious use. Use that would have rendered previous incarnations of the jibs in the trash can. Mains could well live more than a year.

Mains are interesting, squarehead, stress the sail far less because the mast bends far less. And the Mast is stressed far less because of the Squarehead, it can bends less. WIN - WIN!

But back to it, not quite sure how I engaged Andrew, but speaking to another Taswegen today who commented that Andy was soft, quite, understated but quite extrodinary with what he did.

This was my baby, firstly I was blown away with the amount of data feed back I got, and the freedom with which I got it. A lot of you would have no idea, but I checked and double checked everything I got from Andy against my own data base, and by the time Andy and Tim (Willets - C-Terch) started talking ie's WRT the mast, I had a lot of confidence in what Tim/Andy where proposing.

Back to spreaders.
My stay base is 25° and Andy has set my spreader angle (the same) at 25°.
I probably would have had them further fwd, 22-23° maybe, but it would be more toe than angle, but given that the mast is 112mm for-n-aft and the bend is so much less, all that is going to happen is the D1 tension will be higher.
I may have been more anal about the height, but again, everything is so much simpler with the Squarehead!

Long way to answer a simple queastion!

jB

Very interesting!

How come a square top has less luff curve? Is this because it's an ellipse with the top chopped off and therefore you're not trying to create the elliptical profile on the luff and leach as you near the top?

 

[stinky]

Very interesting!

How come a square top has less luff curve? Is this because it's an ellipse with the top chopped off and therefore you're not trying to create the elliptical profile on the luff and leach as you near the top?

More to do with gust response I think.

With a square top, with the leverage of all that sail up there, it needs only a teeny bit of bend to open up the leech in a gust. With the old pin heads, it took a bunch of bend at the very top of the rig to have it twist off in a gust. The extreme prebend was the way to tune the response.

 

[Irrational 14]

Leech control. It’s far more efficient with a square top and stiffer rig.

 

[Scillyjosh]

Diagram to explain what I was saying, drawn with 28% head/foot and 2% mast bend:

Square top is just a truncated elliptical wing, 2% bend on a square top is more like 4% on the comparable pin top main.

 

[JulianB]

I’m sure there are 1’000s of square head stories.

Mine starts around 1990ish when we purchased & moved into our new factory in Harbord, (Northern Sydney).

Upstairs next door was Chris Cairns and very accomplished Tornado sailor, (multiple World Champion, made all the best peoples sails) and he moonlighted (his words) as a sailmaker.

At this time, we were in full 18teen mode, World Champions, Grand Prix Champions, lots of really accomplished people flowed in and out of our factory, and Chris would occasionally join us for lunch.

In those day 18teen we had Pin-head mains and we had mast design and fabrication “on a string” and accomplishing some extraordinary results across numerous sailors and classes. Fun time!

Chris was also achieving some extraordinary results but the issue with the Tornado in those days was it had a telegraph pole as a mast, big alloy extrusion, and he had no where the capacity to get what my father would have called a “active batten rig”. He may well not have wish one, different beasts.

Cut a long story short, Tornados started with pinheads and he started making the head bigger and bigger, and he and I spoke quite regularly, if he did not come down to lunch, I went up, and his idea was that the extra sail material hanging off the back of the mast up high would feather that sail.

It was Dacron in those days with weft and bias, and he was quite adept at rocking the panels to get the desire result.

I though not a lot of it, because we had rigs on a string, so the initial 49er (1995) had our pin-head technology and they where great rigs. 29er rig is still pin-head (1998) and it works.

Then fast fwd to 2008, good 49er sailors had a “quiver” of masts, the worst I think was Marcus Baur (GER) who travelled with 9 complete masts. Something had to happen, so as you do when changing one bit of technology, you look around at surrounding technology. Carbon tubes had come leaps and bound by then and Squareheads were starting to appear, so a decision was made, possibly for marketing reasons that we should look at those rigs in more detail.

Again, cut a shorter story even shorter, Harry (my son who was 18teen at the time) was steering, Simon Watin (FRA, my intern, full on Rocket scientist probably 23-24) was in the bow, 49er, not sure whose main it was, probably Maka or Norths, we were off Clifton Gardens in my speed boat, Dad in the bow, and he looked at me in dis-belief and said something along the lines, “it all works”.

Ya got to remember Dad was 88 at this stage, we had got pinheads working so well, and he had worked out all the maths, all the principals, everything and that night Dad in Imperial and Simon in SI’s did this circular sum and it all came out within 0.1%.

Then Dad was Dad, drop pin-head, almost 3 nights of no sleep, he was on a mission, and by the end of that year (this was May, so another 6 months probably) massive input in the end from Maka, Southern’s, JC at Mackay’s, Chris from Ovington’s, the I49erCA were sensational we had a “working” carbon mast with a working squarehead main and further we knew why it worked (because of Dad).

So to your question as to why there is so little mast bend.

Because very clever sailmakers are adept to aligning the panels and the fibres in the top quartile of the sail so that they exploit the natural elasticity in the sail material so as to achieve appropriate feather of the upper mainsail so that a) it depowers on a gust by gust basis and b) at the same time it effectively endplates to upper sail therefore achieving significant endplate/AR [Aspect Ratio] benefits, plus c) it can do all of this with ½ the mast bend range.

So what that then benefits is you can design “trigger battens”, so this is the one at approx. 45° at the top, sometimes call the gaff and the one directly underneath to very specific Euler Crippling/ei loads so they enhance the sailmakers work.

Then you get the mast manufactures who then dial in the right ei’s up and down the rig to enhance both the sailmakers work and that of the batten maker (batten maker and mast maker are often the same).

All that leads to masts which in themselves are operating in a very benign range of bend which equals minimal fibre elongation/elasticity so i) they are very safe and ii) have enhance longevity.

Then you go one step even further up and engage someone like Andy and it’s heaven on a stick.

The other thing is that Carbon mast technology has benefited enormously from the 787/A350, and the sailmakers, be it 3Di or Stratis etc etc now can far more accurately predict loads and elongations of material. The other thing that the Andy’s of this world do is dictate the ei’s of the batten.

Before I would have started with a quiver of material, in fact I was thinking about this only a month ago, how do I put the 89er on it’s side to “tweak” the battens as I have done in the past with 49ers, 18teens and 29er. Now, I pulled the main up and we are 99% of the way there. Few tweaks needed sure, the next 2-3 months will be tweak this or tweak that, but simple and minor.

Start with a really good base and expand on that.

 

[Steve Clark]

To add To Julian’s history.
Many others with full battened sails were working on the same problems. Many developed their own jargon which didn’t necessarily mean what others might have thought it to mean. Given the quality of materials and the experimenters lack of sophistication, many dogs were barking up the same tree but using different language to describe it, and all touting their originality.
Some sailboard guys looked at our ICs and said” they are using a lot of our technology.” Falsely believing that the full batten mainsail and the pointy stern were first developed in sailboards. “ they have pin tails so they can carve their gybes” and so forth.
As another example, I didn’t see much new or remarkable about the 49er rig when I first saw one in 1997 because we had been pawing the same ground with the IC for 20 years with some success. The language was different and I was less than sympathetic as we went through 9+ versions of the mast trying to find one to stand up to the “inexperience” of the not Australian sailors. What Frank and Julian achieved with masts, we knew could be done with plan form and sail cloth. There was some intractability on both sides.
The catamaran solution was to sweep the diamond struts and crank the diamond tensions through the moon to pre bend the mast and get it out of column. Contrary to what you might expect, you tighten the diamonds to make the mast bendier. Prior to 1980 we tightened diamonds to make the mast stiffer. The modern 18s actively adjust shroud tension during a leg to achieve the same effect.

At some point you just get sick of all the voodoo and start building wings that do exactly what you design them to do.
This thread is a great tour through the World According to Julian.
SHC

 

[Scillyjosh]

I’m sure there are 1’000s of square head stories.

Mine starts around 1990ish when we purchased & moved into our new factory in Harbord, (Northern Sydney).

Upstairs next door was Chris Cairns and very accomplished Tornado sailor, (multiple World Champion, made all the best peoples sails) and he moonlighted (his words) as a sailmaker.

At this time, we were in full 18teen mode, World Champions, Grand Prix Champions, lots of really accomplished people flowed in and out of our factory, and Chris would occasionally join us for lunch.

In those day 18teen we had Pin-head mains and we had mast design and fabrication “on a string” and accomplishing some extraordinary results across numerous sailors and classes. Fun time!

Chris was also achieving some extraordinary results but the issue with the Tornado in those days was it had a telegraph pole as a mast, big alloy extrusion, and he had no where the capacity to get what my father would have called a “active batten rig”. He may well not have wish one, different beasts.

Cut a long story short, Tornados started with pinheads and he started making the head bigger and bigger, and he and I spoke quite regularly, if he did not come down to lunch, I went up, and his idea was that the extra sail material hanging off the back of the mast up high would feather that sail.

It was Dacron in those days with weft and bias, and he was quite adept at rocking the panels to get the desire result.

I though not a lot of it, because we had rigs on a string, so the initial 49er (1995) had our pin-head technology and they where great rigs. 29er rig is still pin-head (1998) and it works.

Then fast fwd to 2008, good 49er sailors had a “quiver” of masts, the worst I think was Marcus Baur (GER) who travelled with 9 complete masts. Something had to happen, so as you do when changing one bit of technology, you look around at surrounding technology. Carbon tubes had come leaps and bound by then and Squareheads were starting to appear, so a decision was made, possibly for marketing reasons that we should look at those rigs in more detail.

Again, cut a shorter story even shorter, Harry (my son who was 18teen at the time) was steering, Simon Watin (FRA, my intern, full on Rocket scientist probably 23-24) was in the bow, 49er, not sure whose main it was, probably Maka or Norths, we were off Clifton Gardens in my speed boat, Dad in the bow, and he looked at me in dis-belief and said something along the lines, “it all works”.

Ya got to remember Dad was 88 at this stage, we had got pinheads working so well, and he had worked out all the maths, all the principals, everything and that night Dad in Imperial and Simon in SI’s did this circular sum and it all came out within 0.1%.

Then Dad was Dad, drop pin-head, almost 3 nights of no sleep, he was on a mission, and by the end of that year (this was May, so another 6 months probably) massive input in the end from Maka, Southern’s, JC at Mackay’s, Chris from Ovington’s, the I49erCA were sensational we had a “working” carbon mast with a working squarehead main and further we knew why it worked (because of Dad).

So to your question as to why there is so little mast bend.

Because very clever sailmakers are adept to aligning the panels and the fibres in the top quartile of the sail so that they exploit the natural elasticity in the sail material so as to achieve appropriate feather of the upper mainsail so that a) it depowers on a gust by gust basis and b) at the same time it effectively endplates to upper sail therefore achieving significant endplate/AR [Aspect Ratio] benefits, plus c) it can do all of this with ½ the mast bend range.

So what that then benefits is you can design “trigger battens”, so this is the one at approx. 45° at the top, sometimes call the gaff and the one directly underneath to very specific Euler Crippling/ei loads so they enhance the sailmakers work.

Then you get the mast manufactures who then dial in the right ei’s up and down the rig to enhance both the sailmakers work and that of the batten maker (batten maker and mast maker are often the same).

All that leads to masts which in themselves are operating in a very benign range of bend which equals minimal fibre elongation/elasticity so i) they are very safe and ii) have enhance longevity.

Then you go one step even further up and engage someone like Andy and it’s heaven on a stick.

The other thing is that Carbon mast technology has benefited enormously from the 787/A350, and the sailmakers, be it 3Di or Stratis etc etc now can far more accurately predict loads and elongations of material. The other thing that the Andy’s of this world do is dictate the ei’s of the batten.

Before I would have started with a quiver of material, in fact I was thinking about this only a month ago, how do I put the 89er on it’s side to “tweak” the battens as I have done in the past with 49ers, 18teens and 29er. Now, I pulled the main up and we are 99% of the way there. Few tweaks needed sure, the next 2-3 months will be tweak this or tweak that, but simple and minor.

Start with a really good base and expand on that.

So from my understanding its more of a structural optimisation than the leach profile being optimised for leading edge aero dynamics i.e. if you increase mast stiffness you either need a bigger square top or stretchier cloth or more bend to get the same gust response?

 

[JulianB]

To add To Julian’s history.
Many
SHC

Go to Dinghy Anarchy and read Steve and Dave Clark's UFO and you will get the history of the World according to Clark.
Happy to talk about the 100's of mast tips that the late great Dave Ovigy and Paul Beiker brought off us pre 1996.
Happy to talk about Mckee's (USA), Ono's (JPN), Oswalds (SUI), Lewanders (SWE) and Ovington's (GBR) who all streamed into Australia to learn "Styryne".
Happy to chat about wings, what you and Fred Eton did (and Fred is a whole other story) and then again the Paul Larsen/Vesta rocket program WOW! I could go on about Vesta for years, how inspirational was that! But also their complete inappropriateness for use on skiffs in harbors like Sydney, and Gottenburg and even Garda. (Bora is a case in point)
And happy to talk about Olympics, think I am on the only person to do it 3 times, ICA's, WS, IOC, the pit-falls, and the words of wisdom from the late great Ian Bruce and Ward McKim, both you knew.

But this is a 89er page, I was asked to do this so of course its the world according to Bethwaite.
If you don't like it, don't read it!
And hopefully in little over 2 hrs, I will get to do what you had the opportunity to do so many more times, than I, and that is take my boat, designed without compromise to anyone else, for a sail.

So all the other stuff will have to wait. I'm on a mission!

jB

 

[JulianB]

So from my understanding its more of a structural optimisation than the leach profile being optimised for leading edge aero dynamics i.e. if you increase mast stiffness you either need a bigger square top or stretchier cloth or more bend to get the same gust response?

Mate, I'm not a sailmaker, but I know what I want.

I have watched Maka, on countless occasions, possibly the WING, C-Rigs and the C2Byte rig where the most challenging, because they were free standing, but even the XX and 29erC rigs, the boat would be on it's side, we weren't getting what we wanted, so addition of a bit of Carbon tape here or there altered the whole dynamics of the sail and it's response.
He would then go away and re do the top of the sail by altering the rocking of the panels to achieve the same response.

As it has been explained to be, it's about keeping the elongation of the Mylar within it's elastic limits (the Carbon tubes are no were near their Elastic limits) so it can react many many millions of cycles the same way. In any given race any sail many react 200-300 times per windward leg, so to ratchet up 100,000 is not that hard. In a year you will hit 1m easily.

Again, as mentioned before, back in the 1990's, we measured the fall off of very hi end alloy in 3-4 months of sailing 18teen 4 times per week (with 3 rigs) so in-effect if you had one rig sailing once a week you would expect some alteration (may not all be bad) in 3-4 months.

If you are going to hang a spinnaker of the top of a mast, then the strength and the rigging of that mast is such that you can't mast the tip flexible enough to make a Pin (ellipse) head work properly and if your sailing a single-hander, and if you want "sparkling" performance down-hill then the extra area up hi, working well up-wind, that will kick in down-wind and make it so much more enticing.

So your right, but you need such small movements in the Mylar to achieve great gains.

Chris Carin's did it with Dacron, Norths are now doing it with 3Di just a different order.

 

[Steve Clark]

Go to Dinghy Anarchy and read Steve and Dave Clark's UFO and you will get the history of the World according to Clark.
Happy to talk about the 100's of mast tips that the late great Dave Ovigy and Paul Beiker brought off us pre 1996.
Happy to talk about Mckee's (USA), Ono's (JPN), Oswalds (SUI), Lewanders (SWE) and Ovington's (GBR) who all streamed into Australia to learn "Styryne".
Happy to chat about wings, what you and Fred Eton did (and Fred is a whole other story) and then again the Paul Larsen/Vesta rocket program WOW! I could go on about Vesta for years, how inspirational was that! But also their complete inappropriateness for use on skiffs in harbors like Sydney, and Gottenburg and even Garda. (Bora is a case in point)
And happy to talk about Olympics, think I am on the only person to do it 3 times, ICA's, WS, IOC, the pit-falls, and the words of wisdom from the late great Ian Bruce and Ward McKim, both you knew.

But this is a 89er page, I was asked to do this so of course its the world according to Bethwaite.
If you don't like it, don't read it!
And hopefully in little over 2 hrs, I will get to do what you had the opportunity to do so many more times, than I, and that is take my boat, designed without compromise to anyone else, for a sail.

So all the other stuff will have to wait. I'm on a mission!

jB

Enjoy reading this thread, and thought I might be stepping on your toes. Almost hit don’t send. Sorry about that.
What I was trying to say is that this sail mast business is really complicated and that everything plays a part and people have had equal success working through the problem from different starting places. The turbulent boundary layer of planet Earth is a gnarly place.
Barry Marmion ( 1987 or so) made the first square head A Class rig trying to duplicate the fat tip of a C Class wing. It turned out that the REAL benefit wasn’t in the plan form but with the twist dynamics.
Don’t Panic ( in small friendly letters) looks great. I have been thinking about using Basalt but you are way ahead of me on that, I have reverted to plywood recently for the last two builds.
SHC

 

[Varan]

...
And hopefully in little over 2 hrs, I will get to ... take my boat, designed without compromise to anyone else, for a sail.
..

How cool. Please keep us 89er fans informed. Thank you so much for sharing and best wishes for a great holiday season.

 

[JulianB]

So we did get sailing. Short but very sweet. 10-14 knt SE, gusty, max speed was 15.6. Upwind at 7-8s.
Stripped the main halyard again, got a bulb wobble but all went very well.
Off dor some Chrissy cheer with Witty to celebrate. could be a big night.
jB

 

[allweather]

Upwind at 7-8s.
Stripped the main halyard again, got a bulb wobble but all went very well.

That sounds very sweet indeed. Awesome upwind speed on the first try with all the tweaking still ahead.

When you said bulb wobble, you mean it started vibrating? I am interested in seeing how this develops and what you'll do, if anything, to address that kind of thing.

 

[BrightAyes]

Mate: pics and vids or it didn't happen

 

[Jethrow]

When you said bulb wobble, you mean it started vibrating? I am interested in seeing how this develops and what you'll do, if anything, to address that kind of thing.

Cut it off!

 

[JulianB]

OK, longer report.

Boat went in the water about 1:15.
Crew was GT, Jack, Nicky, Sir JJ and me, probably 390-410kgs, so under cooked.
Wind was 10-14 knots SE, we came out of Rushcutters Bay doing 7-8's 2-sail, called for the spin, that all happened effortlessly, for those that know Sydney, we would have been 1/2 way between Garden & Clark Islands, pretty gusty, so took a while for the spin to fill, but once it did, bore away and headed towards Cremone Point, Stb gybe, all the crew were up on the side, boat accelerated well and about 13-14knts of SOG a 2 Hz womp, womp started, very rythmic, became very apparent. I call for us to slow it down, get the spinnaker off, by now we would have been north of GI and at some point during that mayhem we where doing 15-16 knts of SOG.

Kept going for a bit, approx 1/2 way across the harbor east of Pinch-gut, rounded up, main halyard stripped, so short delay, while we tied it up, then on the breeze, everyone up, worked our way up toward Point Piper/Double Bay, got the Jib working well, few issue with main not being right up, so not enough down-haul, some issue with the coarse/fine tune on both main and jib, but not insurmountable. Looking back at the graphs, we were doing 7-8knts most of the time, with a Tacking angle of hi 80-low 90°.
Tacked, in the middle of Double Bay, headed off 2-sail on Pt gybe and watched the speed increase, 12-13-14 knts, most of the crew on the gunwale, no repeat oscillation, no womp-womp.

So we headed, back in, (it was a very big night) put it to bed, but very happy.

Heading over there right now to pull the fin out and I will report back!
Hope to be sailing again Thursday.

jB

 

[JulianB]

 

[allweather]

Got to smile at that fender, hadn't even thought of the overhangs needing that. like the foils
Also, looks gorgeous floating like that!

Thanks for the update on how it felt on the water as well as some details regarding the halyard, knock on effect on trim and unrelated things you've already spotted to be in need of adjustment to sort out properly.