About this tender
The SR77 is the build we ask Windy for when a programme genuinely needs a 24-metre chase platform rather than an oversized tender. At 23.98m LOA it is the largest hull Windy has produced, and the propulsion choice defines its character: twin MAN V12-1800s driving waterjets for owners who want speed and simplicity, or three Volvo Penta IPS 1350 units for those who prefer low-speed manoeuvrability and fuel economy on longer transits. Both routes are developed in direct dialogue with Windy's engineering team, and neither is an afterthought.
Naval architecture and exterior design come from Malcolm McKeon Yacht Design, a practice whose superyacht credentials give the SR77 a hull geometry and above-waterline profile that sits comfortably alongside purpose-built expedition and chase vessels from larger European yards. Interior arrangement is bespoke to each order, which is appropriate at this scale. The published range figure of 600 nm is quoted with the long-range tank fitted on the waterjet configuration, so buyers speccing for extended passages should confirm tank layout early in the project.
CE Category B certification covers coastal and offshore passages in significant wave heights up to four metres, which is the correct envelope for a vessel supporting a superyacht programme across the Mediterranean, Northern Europe, or the Caribbean. The 8,800-litre fuel capacity and 1,000-litre fresh water tankage are serious numbers that reflect genuine offshore intent rather than day-boat aspirations. At 48.5 tonnes displacement this is not a hull that stows in a garage; it is a dedicated support vessel that travels independently or on davits from a very large mothership.
Highlights
The four details we'd point out first to a captain who hasn't seen one on the water yet.
Both naval architecture and exterior design are attributed to Malcolm McKeon Yacht Design Ltd, a practice with a strong superyacht pedigree. That provenance matters at this size: the hull lines, structural engineering, and above-waterline proportions are developed to a standard that competes directly with dedicated chase vessel builders from the Netherlands and Italy.
Buyers choose between twin MAN V12-1800 engines driving waterjets, suited to higher-speed chase and security roles, or three Volvo Penta IPS 1350 units, which offer joystick docking and better fuel efficiency at lower cruise speeds. The two configurations produce meaningfully different handling characters, and the decision should be made early given its structural implications.
The 600 nm range figure is quoted for the waterjet configuration with the long-range tank fitted. The 8,800-litre standard fuel capacity is substantial for a 24-metre hull, and the optional long-range tank extends independent passage-making to a level that supports Atlantic crossings as a transit vessel without fuel stops at every port.
No standard interior is offered. Deck layout, cabin arrangement, bathroom specification, materials, and onboard systems are all defined per order. For owners whose yacht already has a strong interior design language, this means the SR77 can be finished to match rather than simply complement the mothership.
The published displacement of 48.5 tonnes gives a realistic picture of structure and outfit quality. It is not a lightweight racing hull; it is built to carry a full crew, guest accommodation, and a significant toy programme over extended passages, which is precisely what a flagship chase vessel at this length should do.
Gallery
The full specification
Specifications, prices, availability, and performance figures are supplied for guidance only and remain subject to confirmation by the yard, seller, broker, survey, contract, and final specification.
Questions, answered
Lead time · 12+ months
Windy · Västervik, Sweden
Tell us about your yacht, your programme, and the missions SR77 needs to handle. Build slot is currently 12+ months; we come back within 48 hours with a written assessment, options to shorten the lead time, and trade-offs against alternatives.
Prefer to talk? +44 (0) 77180 88055 · other ways to reach us
From the library
