For 25 years, Holger Bührle has worked tirelessly to build Hulg, an extraordinary boat born of a vision of freedom and self-sufficiency. More than just a sailboat, this titanic project is a model of innovation in which every detail, from the rigging to the engines, is designed to guarantee performance, durability and autonomy at sea. In this second part, we look at the technical aspects that make Hulg a model of ingenuity.
Exemplary energy autonomy
The Hulg is a concentrate of technology. All its installations have been digitized and networked, a feat that allows centralized management and continuous adaptation to technological developments. At the helm of this modernity is a customized PLC control system, providing the automation and flexibility needed to meet future requirements, whether in terms of performance or on-board comfort. Designed to adapt to any situation, Hulg offers an outstanding electrical configuration: a 380V three-phase network, 220V AC, and several DC options (24V, 12V, 5V for USB). Even the shore power supply is galvanically isolated at 110V, ideal for U.S. standards. An impressive versatility that meets all requirements, whether in coastal navigation or on the high seas.
Two wind turbines and four mobile solar panels power the two battery banks, totalling 880 Amh/24V. This system considerably reduces the need to rely on diesel engines for recharging. The result is a quieter, more environmentally-friendly boat, capable of offering impressive energy autonomy.
Hydraulic systems: the key to total autonomy
Hulg is equipped with over 70 hydraulic actuators, controlled by remote control, operating everything from winches and furlers to windlass systems and emergency pumps. This complex network, cooled by seawater, provides autonomy for long voyages. The bow thruster is also hydraulically and hydrodynamically optimized.
A hybrid engine for versatility
The main engine, a 220 kW Iveco, is coupled to two hydraulic propulsion pods, an innovative solution for precise, silent control. This system, fully controllable by remote control, enables precise maneuvering for a boat of this size, even in confined spaces. In addition, an auxiliary motor ensures energy redundancy and powers the numerous on-board systems.
The man behind the technology
Holger is known for his pragmatic philosophy and sense of ingenuity. Although he mainly works alone, he calls on experts when necessary, particularly to validate certain technical aspects such as hydraulic systems and hybrid powertrains. This mix of autonomy and collaboration reflects his personality: a determined man, yet aware of the limits of his knowledge. His method is based on an empirical approach: he learns by doing I've always wanted to do everything myself and learn everything. How to build a refrigerator? How to weld a bar? How to bake bread? And how do I build an x-meter-long aluminum hull in my backyard? Questions that make my self-taught heart soar. Learn from your mistakes and always move forward and develop - that's my motto he points out.
After 25 years of hard work, Hulg is the reflection of a life dedicated to a dream. Holger Bührle didn't just build a boat, he organized his life around it. His home in a Black Forest village has become a permanent construction site. His garden houses the schooner's imposing hull, surrounded by tools, materials and prototypes. This physical proximity between his home and his boatyard illustrates his total commitment to the project - a commitment that comes at a price, since Holger financed a large part of the construction from his own resources, cutting back on his personal expenses. The remainder came from generous donors.
To ensure that this dream does not remain a mere personal ambition, Bührle has created "Free HULG GmbH & Co. KG", an initiative that enables sailing enthusiasts, both amateur and professional, to become actively involved in the project. In addition to the opportunity to purchase Hulg spare parts, the community of participants benefits from pre-bookings, discounts, and active participation in the final construction phase as well as cruises once the boat is launched.
Holger reports that the interior work is nearing completion and should be finished in 2024. Right now, he's busy ordering the rigging.
L he launch of Hulg in 2025 will mark a milestone in this extraordinary adventure. To follow the progress of this project, visit the official website.
