A good multihull sail should do more than pull hard in flat water. It should stay composed when the breeze builds, keep its shape over time, and remain easy to handle when the boat is moving quickly.
At Loong Sails, we design multihull sails for the way modern catamarans and trimarans are actually used. Some owners want simple, reliable cruising. Some want faster passagemaking. Some want a sharper, more responsive setup for performance sailing. The right answer depends on the boat, the rig, the handling system and the way you sail. Loong Sails already offers multihull-specific mainsails, including cross-cut and radial-laminated options, as well as Code Zero and gennaker sails, and its quote process is built around boat model, rig configuration and intended use.
Multihull Sail Efficiency Index
What it means
- MSEI = Multihull Sail Efficiency Index
- SA = Sail Area
- SF = Shape Factor
- TE = Trim Efficiency
- D = Displacement
This formula shows a simple idea: a multihull performs best when it combines the right sail area with stable sail shape and efficient trim, while keeping displacement under control.
In plain terms, more usable sail area gives more driving force. Better shape retention helps the sail keep working properly across changing wind angles. Efficient trim improves control and balance. Lower displacement allows the boat to turn sail power into speed more effectively.
Multihull mainsails
On most multihulls, the mainsail does much of the work. It needs to drive the boat efficiently, depower cleanly and hold its shape under sustained load.
Loong Sails offers multihull mainsails in cross-cut and radial-laminated constructions, including square-top formats where the rig and handling system allow it. A cross-cut sail is often a sensible choice for owners who want dependable service, durability and value. A radial-laminated sail suits owners looking for better load distribution, stronger shape retention and more refined performance.
Reaching and light-air power
Many multihulls come alive when they have the right reaching sail. In lighter conditions, the difference between an ordinary setup and a well-chosen Code Zero or gennaker can be dramatic.
Loong Sails offers both Code Zero and gennaker options. A Code Zero is designed to add efficient power in light to moderate wind, especially from close reaching through to freer angles. A gennaker adds easy off-wind power and is a strong choice for owners who want simple handling with clear gains in lighter breeze.
EnduraTech for owners who want more life from the sail
For owners who want a stronger balance between performance and service life, EnduraTech is one of the most interesting parts of the Loong Sails offer.
Loong Sails states that EnduraTech is built without Mylar and is designed to resist stretch and UV degradation while remaining lighter for a given level of strength. The company also says the design team uses advanced software and precision 3D moulds to tailor the sail to the aerodynamics of each boat type. In plain terms, that means a sail intended to keep its shape longer and stay useful in real cruising conditions, not just look good when it is new.
Design backed by engineering
A multihull page needs technical credibility. Customers in this part of the market usually know enough to spot empty language.
Loong Sails already has the right technical story to tell. The company says its design team works with Computational Fluid Dynamics and Finite Element Analysis, and that its design process is used to improve aerodynamic efficiency, structural integrity and real-world performance. That matters on multihulls because shape stability, load paths and handling loads are not small details. They are central to how the boat feels and performs.
Built around the details that matter
The right sail on paper can still disappoint if the small details are wrong. Batten layout, reef positions, luff hardware, furling compatibility and clew geometry all affect how a multihull sail behaves in daily use.
When we quote a multihull sail, we want to know the actual boat, the rig setup, the handling system and how the owner expects to use the boat. Loong Sails’ quote form already asks for the boat make and model, rig configuration, sailing type and selected sail types. That is exactly the right starting point for a serious multihull enquiry.
For cruising, passagemaking and performance use
Some multihull owners want a robust cruising sail plan that can take miles, sun and repeated reefing. Others want a lighter and more responsive setup for faster sailing. Many want something in between.
Our multihull range is built to cover that full spread. We can help with dependable cruising mainsails, higher-specification laminated options, and reaching and downwind sails that open up the boat in lighter conditions. The aim is not to make every boat look like a race boat. The aim is to make each boat sail properly for the owner who uses it. That balance between performance, durability and ease of use is exactly what the better multihull sailmakers now emphasise across the market.