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

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