- Technology and Innovation
Unstayed Wingsails and Zero Fuel: Inside the 70-Foot MODX Architecture
The Evolution of Zero-Emission Sailing
Developing an energy-sober catamaran demands a total reassessment of standard naval architecture. Born from the combined expertise of the MOD 70 racing trimarans and the solar-powered Race for Water platform, Océan Développement has introduced the MODX 70. Designed in collaboration with VPLP, this 100 per cent electric, 70-foot multihull operates entirely without fossil-fuel backup systems, relying strictly on renewable generation to achieve complete energy self-sufficiency during long-range ocean passages.
Inflatable Wingsails Without Rigging
The most radical departure from conventional sailing lies on the coachroof. The MODX 70 replaces traditional main and jib sails with two Aeroforce vertical wingsails mounted on unstayed, telescopic masts. Each 125-square-metre flexible wing inflates in roughly eight minutes and rotates through 360 degrees, eliminating standing rigging, spars, and deck winches. Controlled via a touchscreen digital interface, the computer-managed system adjusts the wings’ angle of attack, allowing a single operator to dial power up or down much like a conventional motorboat throttle.
Autonomy and Hydrogeneration Dynamics
Achieving reliable electric range requires a strictly optimized hull form. VPLP engineered a light, slender structure with a high length-to-width ratio to minimize drag and guarantee electrical autonomy under motor. Powered by twin 40kW electric motors connected to a 250kWh lithium-ion battery bank, the yacht delivers a 120-nautical-mile range at five knots. To recharge the system, 70 square metres of solar panels generate up to 15kW at peak sunlight, while the turning propellers produce a matching 15kW through hydrogeneration while underway under sail.
Pure Push-Button Living Volumes
Removing control lines and winches transforms the interior ergonomics of the central saloon. High overhead clearances and tall windows flood the living area with natural light, showcasing a U-shaped galley equipped with Corian surfaces and premium domestic appliances. The navigation station sits forward with an unobstructed view, where the only visual indicators of the sail plan are the clean white rotating tubes extending through the coachroof. The layout is offered in two primary configurations, including a dedicated owner’s suite in the starboard hull or a four-cabin en-suite arrangement for family cruising and charter.
Biosourced Composite Construction
Environmental responsibility on the MODX 70 extends directly into the structural materials. The hull is infused using InfuGreen biosourced resin over a glassfibre structure, utilizing carbon reinforcement strictly at high-stress points to limit overall manufacturing emissions while extending structural lifespan. The decks feature Esthec composite materials made from recycled and natural ingredients, while interior headlinings utilize Varian, a hard-wearing fabric woven from flax and corn starch. The result is an uncompromising, highly efficient platform capable of hitting 15 knots of boat speed in a 20-knot breeze.
