The Wirth WR aerodynamic dome kit is a front bulkhead roof fairing designed for tall curtainsider double deck trailers, typically around 4.9m overall height. It modifies airflow at the leading edge of the trailer to reduce aerodynamic drag during forward travel.
The dome is installed at the junction between the front bulkhead and roof line, helping to smooth the transition of air over the trailer body. This reduces turbulence and flow separation, which are key contributors to drag on tall trailer profiles.
Under controlled test conditions, the kit has demonstrated measurable efficiency improvements when compared to an unmodified tall curtainsider trailer:
- Approximately 10% reduction in aerodynamic drag versus an un-kitted 4.9m tall trailer
- Fuel consumption reduction of around 5% at a constant 55mph
- Lower fuel usage contributes directly to reduced operating costs and lower carbon emissions
- Typical return on investment achieved in under 12 months, depending on duty cycle and utilisation
Performance will vary depending on vehicle specification, loading, route profile and operating conditions, but the dome is intended for fleets operating high-profile curtainsider equipment where aerodynamic losses are more significant.
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