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Posts Tagged ‘Mirabella V’

2011 St. Barths Bucket Brings Together World’s Largest Superyachts

Doyle Sailmakers is proud to have sponsored the St. Barths Bucket Regatta held March 25-27, 2011. This year marked the 25th year of Bucket racing – and the 15th edition of the St Barths Bucket. Of the 40 superyachts competing in this legendary event, 15 were new to the Bucket fleet. The average length of yacht was a staggering 64 meters. Lined up bow to stern, the yachts would measure almost three kilometers.

Maltese Falcon at 2011 St Barths Bucket

It was a spectacular sight to be seen with the 89m dyna rig Maltese Falcon, 75m Mirabella V and 58m Kokomo III all on the same starting line at the 2011 St. Barths Bucket with 100% Doyle Sails.

Kokomo III at 2011 St Barths Bucket

During three days of racing, the fleet of 40 superyachts raced around the volcanic island counterclockwise on day one, tackled the infamous “Not So Wiggly Course” on day two, and on day three raced around the island clockwise. The fleet is divided into three categories: Les Elegantes des Mers for the J Class, Les Grandes Dames des Mers for the Cruising Class, and Les Gazelles des Mers for the Racing Class, making the racing more equally competitive and safer. The races are pursuit format, with staggered starts according to each yacht’s rating. The slowest boat is first off the line, and the rest of the fleet starts at time intervals determined by each boat’s predicted elapsed time around the course. Theoretically in a pursuit race, all the yachts will cross the finish line at the same time.

Mirabella V and Kokomo III carried the latest Doyle Stratis sails, while Maltese Falcon carried her 25,791 square feet of Dacron Doyle sails that have taken her over 90,000 miles.

The 96´sloop Symmetry with a full inventory of Doyle Stratis upwind and Doyle downwind sails came in 3rd Overall and 2nd in Les Gazelles.

AXIA at 2011 St Barths BucketAxia

Perhaps the belle of the ball was the 37m AXIA, one of the smallest yachts in Les Grandes Dames, who won her class with her new Doyle Stratis sails.

The Ron Holland designed Blue Too came in 3rd in Les Grand Dames. Blue Too was delivered to its new Owner just six weeks before the Bucket. Blue Too was powered by Doyle Stratis Carbon/Vectran sails and Doyle downwind sails. This was the owner’s first Bucket as an Owner and what an impressive first Bucket it was for him, the Captain and Crew.

Blue Too Celebrating 3rd in Les Grand Dames and the Alloy Cup

In addition to coming in 3rd in class, Blue Too won the Alloy Cup, for best performance by an Alloy Yacht. The four Alloy Yacht competitors included: Kokomo III 58m, Genevieve 38m, Blue Too 34m, and Paraiso 32m.

The 38m P2 won the Perini Navi Cup, awarded to the Perini-Navi Yacht with the best result. Of the 40 yachts competing, the seven Perini-Navi yachts include: Maltese Falcon 88m, Parsifal III 54m, Klosters 47m, Antara 46m, Helios II 45m, and P2 38m.

Maltese Falcon won the Vitter’s Shipyard Seamanship Trophy, awarded to the yacht that demonstrates the best seamanship and sportsmanship in the interest of promoting safety on the race course. This award recognizes the yacht that best demonstrates the understanding that superyachts have serious limitations operating safely in close quarters and value safety well above performance.

In addition to coming in 1st in Les Grand Dames, AXIA also successfully defended the Skullduggery Cravat, holding the trophy for the best Bucket humor for 3 years running. The Skullduggery Cravat is awarded to the yacht and crew who display the best Bucket humor and promulgates non-adult behavior.

To view more photos click here of the 2011 St. Barths Bucket.

Doyle Sailmakers Sponsors 2011 St. Barths Bucket

St. Barths Bucket 2011

Doyle Sailmakers is proud to sponsor the 2011 St Barths Bucket and celebrate the 25th anniversary of the Bucket Regattas. Doyle Sailmakers extends its congratulations to the Bucket organizers and to the superyacht owners and crew for the growth of the Bucket Regattas and of superyacht racing in general.

Numerous superyachts with Doyle sails will be taking part in the 2011 St Barths Bucket including: Axia, Blue Too, Drumbeg, Helios, Hetairos, Kokomo III, Maltese Falcon, Mirabella V, Moonbird, P2, Paraiso, Song of the Sea, Symmetry and White Wings.

What is the World’s Largest Main Made Of?

Doyle Stratis.

If you want the strongest, most reliable sails, choose Doyle Stratis. Mirabella V had her new Doyle Stratis mainsail fitted and trialed in St. Martin yesterday. Mirabella V is the largest sloop in the world: the single-masted vessel is 75-meters long (247 feet), and that mast also happens to be the world’s tallest, with the world’s largest main attached to it.

Mirabella V's New Doyle Stratis Main being lifted on the boat

The scale of Mirabella V’s sails required novel engineering, taking full advantage of Doyle’s extensive superyacht experience, from material development to novel construction techniques.

Mirabella V New Stratis Main
Mirabella V New Stratis Main

Mirabella V’s mainsail measures 1,200 square meters (12,900 square feet). Building and designing Stratis membranes for this sized boat facilitated the need for a new view on the engineering and safety margins. Tyler Doyle modeled the loads using Doyle’s combined CFD-FEA program and designed the structural load paths to best address the enormous loads that this boat will generate. The Stratis main was built in Doyle’s custom built 32,000 square foot superyacht manufacuring facilty in Salem, MA.

Mirabella V Segmented Mainsail

In 2004, when Mirabella was first launched, Doyle invented the “Segmented Mainsail” and “Compression Spring Battens” to allow a sail of Mirabella’s size and complexity to be manufactured, handled and serviced efficiently. With the "Segmented Mainsail" design, the new Stratis mainsail is composed of three separate, yet interdependent, sections. Two full-length battens join the segments at the top and bottom edges to form the complete sail. Building the sail in these segments makes construction, transport and service significantly easier.

Mirabella V Compression Spring BattenThe batten development for Mirabella V was largely a question of optimization: at the required batten stiffness, what is the maximum toughness that could be achieved while minimizing weight aloft? The "Compression Spring Battens" clearly demonstrate Doyle Sailmakers’ commitment to durability and toughness.

Just a year ago Kokomo III was outfitted with 3,038 square meters (32,700 square feet) of Doyle Stratis. Her Gennaker at 2,227 square meters (23,971 square feet) is the largest sail ever constructed. To read more about Kokomo, click here.

 

Kokomo Sets Sail with 3,038 Square Meters of Doyle Stratis

Mirabella V and Maltese Falcon Face Off

Doyle Superyacht Mirabella V
Doyle Superyacht Maltese Falcon

Photo Courtesy Perini Navi

The two largest private sailing yachts in the word, both powered by Doyle Sailmakers, sailed side by side outside of Monaco Harbor. Maltese Falcon is the world’s largest clipper ship, and Mirabella V (M V) is the world’s largest single masted yacht. Tom Perkins, owner of the Maltese Falcon, describes the sail, “It was an overcast day with the true wind was out of the N.E. at twenty knots with gusts to twenty five, and M V set her full main with a big jib and a staysail—she was really powered up, and designer Ron Holland was aboard to supervise the sail trim. We had (of course) everything set as well, and I need to note to our respective insurance carriers that we were NOT racing—we were just sailing together as fast as possible, purely to be sociable. On the wind, both yachts held each other, neither gaining or losing. Our GPS showed 14.5 knots, and it was the same for M V. The Falcon buried her rail a couple of times in the gusts, and finally we furled our mizzen royal to ease the helm, but we didn’t slow at all. We sailed together for about twelve miles and then we bore off for a speed run. The Falcon cranked up to 17 knots and we pulled a little ahead. The photos show M V really screaming through the waves, looking very, very fast, and very, very beautiful.”

James Scott-Anderson, a J-class tactician, was on board Mirabella V reporting for BYM News. James reported that “Once [the main] was up, the number two jib was unfurled and we had about 10 to 18 knots of breeze and were sailing upwind on a close reach with the wind at 75 degrees apparent. The Falcon was about quarter of a mile from of us. We were heeling 15 degrees which was very comfortable sailing, but the speed was surprising. We were doing 15 to 16 knots and this was just on GPS data. Once we settled in, we found that we were able to match the Falcon’s speed – a big surprise even though this point of sail is not the Falcon’s best. It was nonetheless a great thing, as her hull length and sail area is greater than Mirabella’s.”

To read more of James’ account of the sail, click here.

Photos

Maltese Falcon Website

Mirabella V Sailing

Doyle Superyacht Mirabella V

Mirabella V is the largest single masted yacht in the world. Mirabella V is in the Guinness Book of World Records for the world’s largest sail and the world’s tallest mast.Mirabella V’s 300 foot mast required sails 3.5 times larger than any sails every built. For more information on how DOYLE Sailmakers designed and built Mirabella V’s sails, click here.

Trickle Down Theory: The Engineering Reality Show!

In the past year alone Doyle Sailmakers has faced the engineering challenge of building the sails for the 246-foot Mirabella V, the world’s largest sloop, as well as the 285-foot Maltese Falcon, which has a DynaRig consisting of squaresails on three freestanding carbon spars. The engineering challenges of these two mega projects could not be more diverse, yet both have and continue to have a great impact at how we look at and manufacture all our sails.

Meeting the Challenges of the World’s Largest Sloop

Engineering - Mirabella V sails

Mirabella V

On Mirabella V everything had to do with the sails being so much larger than any that had ever been built. The mainsail alone is three times bigger than the previous world’s largest mainsail! The loads are proportionately as large. As the decision was made early on to forego a rollboom, having the sails three times the weight was not an option. A much lighter fabric that could withstand the enormous loads needed to be developed and so Doyle developed OceanWeave®. OceanWeave is a woven Vectran x Vectran fabric that does not require film to stabilize it. The fabric that made up Mirabella V’s main was only 16.1 SM-oz (20.3 ox/yd2, which is lighter than many of the fabrics used on sails 25% the size of MV’s main). The fabric that made up her largest headsail, the UPS, was 8.0 SM-oz-10.1 oz/yd2. OceanWeave!

Mirabella V's Segmented Sail Section

Mirabella V's Segmented Sail

Despite being as weight-efficient as it was, the size and weight, as well as it being a full-battened mainsail, meant that it would be impossible to construct Mirabella V’s main using normal sail manufacturing techniques. Thus, the Segmented Mainsail was born. The Segmented Mainsail allowed the sail to be made in six separate pieces (the top batten was not a segmented batten, but slid into a pocket), connected by the battens that served as connecting hinges. This construction method also allows MV’s main to be serviced in separate segments as needed.

Mirabella V's Spring Battens

Mirabella V's Spring Battens

With battens as long as 80 feet (25 meters), breaking battens had to be avoided at all cost. The fact that the battens hold the sail together made this even more imperative. The Doyle Engineering Department worked with Ted Van Dusen to design extremely resilient battens as well as to develop the compression springs at the inboard end of the battens so that when the battens that overlap the backstay by a whopping 7.5 feet [2.3m] accidentally snapped through between the back stay and the mast they would not break. While it was intended that this would be avoided as much as humanely possible, on the very first setting of the main a 30-degree wind shift that came in at 200 feet off the water (while the wind direction was still the same on deck), tested the Compression Spring Battens to their core—and they passed! The Doyle Engineering Department not only designed the batten end fittings but manufactured them as well.

Soft Corner on Mirabella V

Soft Corner on Mirabella V

After having witnessed the damage that a four- or five-pound leech reef block can do to a sail, when the originally designed reef blocks arrived at the loft weighing 76 pounds we realized we had another challenge. So the Engineering Department took a coffee break and designed the Reefing Donut. These easily removable donuts weigh in at 24 pounds. They could have been lighter but we wanted to maintain the generous 10-inch diameter for the line to bend around as well as have two independent Vectran line attachments. While not invented for Mirabella V, the manufacturing of her sails would have been impossible without the highly refined, integral Soft Corners (first developed for the J Class Velsheda) that provide the strongest possible corners without the needless build up of thickness and weight.

Dynamic Solutions to a Mega-Size DynaRig

DynaRig profile of the Maltese Falcon

Maltese Falcon's DynaRig Profile

The 30,000 square feet of sail area in Maltese Falcon’s three masts is divided into 15 sails (five per mast). The challenge for these sails is that they are stored inside the mast and are deployed integrally into the yardarms, so that when all five sails are out at once on a mast they form a continuous wing. To accomplish this deployment and maintain the desired shape and limit the loading, these sails needed to be constructed to a precision in 3D not demanded by any other rig. Specialty design and paneling programs have had to be employed that go well beyond our normal, refined sail design software.

The latest in finite element analysis for sails, Relax, confirmed our back-of-the-envelope calculation that the best Dacron fabric, with appropriate plying, could handle the loading of the individual sails. Utilizing fabric that would give a bit would lessen the loading on the highly-loaded upper and lower grooves and thus this choice had other significant advantages as well.

As the entire sail, corners and all, need to furl inside the mast there is no room for corner rings or blocks of any sort. There are conditions where the loads generated by this 285-foot vessel will to be borne by a single sail in gale conditions! Thus, the world’s toughest bolt rope needed to be developed. It has been produced from a specially constructed 10 mm Vectran bolt rope by Yale Cordage and inserted into a specially woven Spectra x Spectra bolt rope. This same technology is now being utilized in our bolt ropes for rollboom mainsails.

In summary, detailed load analysis run for both Mirabella V and Maltese Falcon, along with the parsing of the problems we faced in each of these projects, has opened Doyle engineers’ eyes to better solutions for fabric construction, batten construction, batten fittings, rollboom luff tapes, and confirmed the importance of our integral Soft Corners.