Why Weight Matters - The Engineering Behind ROXEN's Lightweight Electric Watercraft

When we began developing the ROXEN 01, we didn’t start with an existing design. We started with a question: What if a personal watercraft were built entirely for electric propulsion - not adapted from combustion?

That question shaped every engineering decision we made.

Built from the hull up

Most traditional jetskis are designed around internal-combustion engines, fuel tanks, and heavy fiberglass hulls.
When manufacturers simply replace those systems with batteries, they inherit the same mass, inefficiency, and structural compromises.

At Roxen Innovations, we went the opposite direction - we rethought the entire architecture around low weight, modularity, and strength.
Every part of the craft was engineered to do more with less.

“Weight is the silent performance killer in most electric vehicles,” says Magnus Sundstedt, CEO of Roxen Innovations.
“By designing light from day one, we didn’t just make an electric jetski - we created a new platform for marine mobility.”

ABS construction - strength through simplicity

Instead of composites or heavy fiberglass, ROXEN uses an ABS hull.
This material gives us:

• Impact resistance - it absorbs shocks without cracking.
• Light, consistent mass - perfect for serial production and balance.
• Easy reparability - scratches and dents can be heat-repaired or plastic-welded.
• Sustainability - ABS is recyclable and requires less resin and energy to form.

The result is a rigid, durable structure that keeps total craft weight at a fraction of traditional PWCs, without sacrificing safety or stability.

Battery architecture built for balance and efficiency

Rather than dropping a large battery pack into a hull, ROXEN's battery system was engineered as a structural component. The swappable battery is mounted low in the hull, improving the center of gravity and eliminating the need for extra reinforcements.

Thanks to advanced cell packaging and thermal integration, ROXEN achieves 159 Wh/kg specific energy - the lightest battery per kWh in the marine toy market¹.
That means more range and performance from a smaller pack, less weight, and faster acceleration.

“Designing light isn’t about compromise, it's about precision,” Sundstedt adds.

¹ Based on publicly available data from Fliteboard (≈ 151 Wh/kg), Awake (≈ 138 Wh/kg), and Radinn (≈ 139 Wh/kg), 2025.

Hydrodynamic harmony

A lighter hull sits higher in the water and requires less energy to plane.
That reduces drag and increases responsiveness - the craft reacts instantly to every movement, carving through turns instead of forcing them.

The result is an electric jetski that feels intuitive, fluid, and balanced - not overpowered or heavy. 

Efficiency equals sustainability

In electric mobility, energy and mass are inseparable.
Every kilogram saved in the jetski extends the range. By minimizing weight in both hull and battery, ROXEN delivers performance and sustainability in the same package.

Fewer materials, fewer charge cycles, less waste - and a ride that feels effortless.

Engineered for the future

ROXEN's entire design philosophy revolves around intelligent simplicity.
Fewer components, less mass, better balance - a system where every element contributes to efficiency.

This is not an evolution of old technology. It’s a complete re-engineering of what an electric personal watercraft can be: light, responsive, quiet, and ready for the next generation of marine adventure.

Summary

• Four times lighter than traditional combustion PWCs
• ABS hull - durable, impact-resistant, and repairable
• 159 Wh/kg battery - lightest per kWh in the marine toy market¹
• Optimized balance through structural battery integration
• Lower drag and higher efficiency for longer rides and faster response
• Reduced material footprint for true sustainable performance

Because in the end, weight isn’t just a number - it’s the invisible force that shapes how freedom feels on the water.

ROXEN. Four times lighter. Four times more fun. The Light Way...