The Technology
Eight years of R&D. A granted patent. A demonstrator whose real-world data confirmed every CFD prediction.
A Turbine Unlike
Any Other
Roth Turbines owns exclusive rights to the patented WindSurf™ Technology Platform — an active-pitch VAWT that rapidly adjusts each aerofoil's angle to extract energy from wind arriving from any direction. Unlike every other small wind turbine on the market, it harnesses both aerodynamic lift and drag simultaneously, using an algorithm-driven control system developed over eight years of R&D.
Each of the five aerofoils is individually controlled by servo motors, adjusting pitch in real time to maximise lift and minimise drag across the full rotation — like an expert sailor trimming a sail on every tack.
Operates at full efficiency regardless of wind direction. No yaw mechanism required. Ideal for urban rooftops, telecom compounds, and rail corridors where wind is turbulent and constantly shifting.
Tip speeds are a fraction of equivalent HAWTs. Noise output is negligible. The solid aluminium structure eliminates composite blade delamination risk — safe to deploy near people, buildings, and transport corridors.
The WS213 survived Storm Éowyn in January 2025 — gusts exceeding 100 mph — without incident. The active-pitch system feathers blades automatically at extreme wind speeds, making it inherently self-protecting.
Aluminium construction and low rotational speed produce no radar signature interference — the decisive characteristic that enables deployment near defence installations and sensitive communications equipment.
Designed and manufactured by Swift Technology Group at Scottow Enterprise Park — an ISO 9001:2015-certified aerospace facility with active MoD contracts. The same team that designed the turbine builds every unit.
CFD Predictions
Confirmed in the Field
The WS133 demonstrator produced real-world efficiency data that matched computational fluid dynamics predictions with remarkable accuracy. This is the decisive validation: the science works as modelled.
- Peak aerodynamic efficiency (Cp) exceeding 53% — materially above any HAWT of comparable capture size
- Useful power generation from wind speeds as low as 2.5 m/s — far below the cut-in threshold of conventional turbines
- Broad, flat efficiency curve maintained across the full operational wind speed range of 3–12 m/s
- Pending IEC 64100-2 Class III certification — to be fully compliant with international small wind turbine standards
