Indestructible HDPE sloop line 'Robust-425'

What began with a strategic discussion about local cooperation in the Westland has led to the development of a unique model line in the Dutch maritime market. In close collaboration with Kemeling Kunststoffen , Robust-MT Marine Technology BV has developed the Robust-425 , better known as “Robbie” . After intensive testing phases with the first prototype, the boat has successfully entered production. This 100% electric and maintenance-free HDPE sloop was entirely designed, finished, and tested locally. The vessel now serves as a permanent demo model during our open days at Havenstraat and attracts national attention at major maritime trade fairs and events.

Customer's wish

The guiding principle for this in-house newbuild project was to bring a boat to market that ensures 100% carefree enjoyment on the water. The market demanded a compact vessel that breaks with the traditional disadvantages and intensive maintenance of fiberglass, wood, or steel. The criteria for the Robust-425 were:

Indestructible construction

The hull had to take a beating, be completely vandal-proof, and require no maintenance anywhere.

Sustainable and circular material

The boat had to be fully recyclable and produced from recycled HDPE.

Completely emission-free boating

A reliable, quiet electric drive that is perfectly suited for local inland waterways and urban areas.

Infrastructure-independent

The possibility to sail without direct dependence on a fixed charging station or shore power at the berth.

Solution by Robust-MT

Kemeling Kunststoffen 's innovative, robotic manufacturing process is perfectly suited for the precise production of this robust sloop. High-quality, solid 15mm thick HDPE sheet material was chosen. The boat was expertly finished in our own workshop in Monster with the following configuration:

The Hull

A self-draining HDPE hull measuring 4.25 meters by 1.60 meters with a weight of 300 kg. The construction is equipped with fixed benches, a watertight foredeck, a steering console, and a lockable engine compartment.

Drive and control

The sloop is equipped as standard with an ePropulsion Spirit 1.0 Evo motor (1 kW), coupled to a professional Robust-branded steering system. Operation is via an ergonomic side-mount throttle lever with an external, blue illuminated display.

Energy storage

The drive system uses the portable ePropulsion Spirit battery. This is neatly housed in the compartment, but can also easily be taken home or to the office in a backpack to charge there.

Finish

Robbie has been made fully ready to sail with a custom cushion set and features various expansion options such as integrated solar panels, a shore power system, or a matching PEGA tilting trailer.

Robbie on tour

The sloop has meanwhile proven itself on various national stages:

Local introduction:

In addition to the successful test voyages, the boat was in the local spotlight during the Street Fair of the Festival Week in Monster.

HISWA on the water

The boat had its official exhibition premiere at the Bataviahaven in Lelystad. As the smallest and most affordable electric sloop at the show, the model attracted a great deal of attention from the public.

SAIL Amsterdam

The sloop was deployed during the prestigious Sustainable Boating Day at SAIL Amsterdam, where it successfully sailed in the fleet on behalf of the Sustainable Boating Coalition.

 
In the Robust-425 introduction article on our website, you will find additional background information about the creation of this rugged sloop.
 

Interested in a custom Robust-425?

Are you curious about current delivery times, the various configuration options with more powerful engines, or would you like a quote based on your specific requirements? Then please contact us without obligation or visit our workshop in Monster for a personal introduction and a test drive.

Result

The Robust-425 is an unqualified success. During extensive practical tests, the HDPE hull has proven to be extremely stable and maneuverable, with excellent acceleration and braking characteristics. Because the material is completely free of paint, lubricating oil, and antifouling, the boat is 100% environmentally friendly and maintenance-free.

Would you like to know what is possible with your boat?

You don't need to know yet which motor, battery, or configuration you need. Tell us what kind of boat you have and how you want to sail it. Then we will help you figure it out.