Ascender
Getting back on board after swimming should not require climbing a vertical ladder with wet hands and feet. On most boats under 20 metres, that is exactly what it takes — a narrow swim ladder bolted to the transom, steep enough to be uncomfortable and awkward enough to be a genuine safety concern for children, older guests, or anyone carrying dive equipment. The ladder works, but it does not belong on a vessel designed for comfort.
The Ascender replaces the ladder entirely. It is a variable hydraulic swim platform with full-width integrated steps that deploy automatically as the platform lowers toward the waterline. In the lowered position, the steps form a wide, gently angled staircase from the water surface to deck level — allowing passengers to walk on and off the boat rather than climb. In the raised cruising position, the steps fold flush into the platform surface and the entire unit integrates seamlessly with the stern, extending the usable deck area for sunbathing or boarding from a dock.
The system is driven by dedicated dual hydraulic cylinders that lock the platform with 100% positional accuracy in the cruising position. It fits any propulsion configuration — outboards, stern drives, pod drives, shaft lines — and can be integrated into new builds or retrofitted to existing vessels. Platform dimensions, step count, surface material, and colour are individually configured to match the boat’s design language. Every unit is manufactured from corrosion- resistant stainless steel at our facility in Münster and delivered fully pre-assembled.
Full-width staircase that replaces the swim ladder
The steps are not added to the platform — they are part of its structure. As the platform rotates downward from the cruising position toward the waterline, the steps deploy through a mechanical linkage that keeps each tread level regardless of the platform’s angle. At any point during the stroke, the step surfaces remain horizontal, providing a stable footing from the first degree of rotation to full deployment.
This self-levelling mechanism is what separates the Ascender from a simple hinged platform. A platform that tilts toward the water might get a swimmer closer to deck level, but the tilted surface is slippery, angled, and offers no defined footing. The Ascender’s steps create distinct, flat treads at regular intervals — wide enough for two feet side by side, deep enough for a secure stance. The result is closer to walking up a short staircase than climbing a ladder. For families with children, guests with limited mobility, or anyone re-boarding in diving gear, this changes the experience fundamentally.
100% positional lock in cruising mode — extended deck area
In the cruising position, the platform sits flush with the stern at deck level. The integrated steps fold flat into the platform surface, creating a continuous, uninterrupted area that extends the usable deck space. This is not dead space occupied by hardware — it is functional deck area that can be used for sunbathing, docking, or as a staging surface when the platform is not deployed for water access.
Two dedicated hydraulic cylinders hold the platform in this position with absolute precision. Unlike single-cylinder systems where the platform can settle or drift under load, the dual-cylinder configuration locks the platform rigidly at the defined cruising angle. There is no creep, no play, no gradual descent under the weight of people standing on the surface. The platform remains stable while underway, at anchor, or alongside a dock. Deployment to the lowered position and return to cruising are controlled via a standard panel and wireless remotes.
Compatible with outboards, stern drives, pod drives, and shaft lines
The Ascender mounts behind the transom and operates independently of the vessel’s propulsion system. Whether the boat is equipped with single or twin outboard engines, IPS pod drives, conventional shaft lines, or stern drives, the platform’s mounting geometry and deployment arc are configured to clear the specific propulsion hardware installed. This is not a one-size-fits-all bracket — the mounting is engineered for each vessel individually, taking into account engine positions, trim ranges, exhaust outlets, and any other aft-mounted components.
This propulsion independence makes the Ascender relevant across a wide range of vessel types: walkaround centre consoles, sport cruisers, flybridge motor yachts, day boats, and even commercial work boats where crew boarding safety is a priority. The blueprint images show installations on Nimbus sport boats with outboard engines, demonstrating how the platform clears the engine mounts and provides full water access without interfering with trim or steering geometry. For the shipyard, this means one platform system that works regardless of which engine package the customer selects.
Visual overview
Examine the Ascender from every angle — side profile showing the step deployment arc, frontal view of the full-width platform installation, and 45° perspective of the scissor mechanism in cruising and deployed positions.
Technical Specifications
A variable hydraulic swim platform with self-levelling integrated steps. Deploys a full-width staircase for water access and folds flush for extended deck area in cruising mode.
MATERIAL
Structural frame and scissor mechanism manufactured from corrosion-resistant stainless steel. Platform surface individually configurable: teak overlay, composite decking, or custom gelcoat matching to vessel colour scheme.
HYDRAULICS
Dual hydraulic cylinders for platform deployment and retraction. 100% positional accuracy in cruising position — no creep or drift under load. Hydraulic power unit available in 12V or 24V. Delivered pre-filled with hydraulic oil, including hoses and fittings.
ANODES
Sacrificial anode package included. Anode type selected based on vessel’s cathodic protection system and operating environment.
DELIVERY
Fully pre-assembled and function-tested at H+B technics, Münster, Germany. Hydraulic unit pre-filled. Ready for direct installation at shipyard or retrofit facility.
"The lifts are not just functional — they match our design and standards. With H+B, it feels more like a team than a supplier relationship."
Frequently asked questions
Answers to the most common questions about the Ascender.
A standard swim platform provides a flat surface at water level but still requires a swim ladder for boarding. The Ascender integrates full-width steps directly into the platform structure. When deployed, these steps form a gently angled staircase from the waterline to deck level. Passengers walk on and off the boat instead of climbing. In cruising mode, the steps fold flush and the platform extends the usable deck area.
Each step is connected through a mechanical self-levelling linkage. As the platform rotates from cruising to deployed position, this linkage keeps every tread horizontal regardless of theplatform angle. The result is stable, flat footing at every point during the deployment arc — from the first degree of rotation to full extension.
Yes. The Ascender is propulsion-independent. The mounting geometry and deployment arc are configured individually for each vessel to clear outboards, stern drives, pod drives, or shaft lines. Engine position, trim range, and exhaust routing are all accounted for during the engineering phase.
Yes. The system requires structural attachment points at the transom and a location for the compact hydraulic power unit (engine compartment, lazarette, or stern void). Electrical supply is 12V or 24V. No hull-shape modification, deck-moulding changes, or engine relocation is required. The platform is delivered fully pre-assembled, reducing installation time significantly.
The steps fold completely flat into the platform surface. The platform locks at deck level via dual hydraulic cylinders with 100% positional accuracy, creating a continuous, flush deck extension. This area can be used for sunbathing, docking operations, or general boarding — it is functional deck space, not dead hardware.
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Customization option
Tailored solutions perfectly suited to your needs. At H+B technics, we not only offer our proven products but also the opportunity to customize them according to your specific requirements. Our experienced team is ready to support you in developing and realizing bespoke products for your yacht or project, always with a strong focus on quality, innovation, and precision.
Whether it’s special dimensions, functions, or an entirely new design, we bring your vision to life. Rely on our expertise and let’s make your ideas a reality together.
Slawa Eichwald
Project Manager
Start your project
Tailored solutions perfectly suited to your needs. At H+B technics, we not only offer our proven products but also the opportunity to customize them according to your specific requirements. Our experienced team is ready to support you in developing and realizing bespoke products for your yacht or project, always with a strong focus on quality, innovation, and precision. Whether it’s special dimensions, functions, or an entirely new design, we bring your vision to life. Rely on our expertise and let’s make your ideas a reality together.
