The Need

Vehicle manufacturers continue to pursue aerodynamic improvements to meet fuel efficiency, emissions, and range targets. Open or partially open wheel wells remain a persistent source of aerodynamic drag, noise, and efficiency loss. Traditional fixed fender skirts improve aerodynamics but cannot accommodate wheel steering without interference, making them impractical for most production vehicles. There is a clear unmet need for a solution that preserves aerodynamic benefits while remaining compatible with actively steered wheels.

The Technology

OSU engineers have developed and patented a morphing fender skirt that dynamically changes shape to accommodate steering motion. In normal driving, the fender skirt maintains a smooth, flush profile that covers the wheel well and improves aerodynamics. During steering events, the structure transitions into a temporarily expanded, domed configuration that clears the wheel’s swept volume. The system achieves this transformation using a compliant exterior surface supported by an internal, shape-changing structure integrated into the vehicle body.

Benefits/Advantages

• Aerodynamic performance: Reduces drag associated with open wheel wells during most driving conditions
• Steering compatibility: Accommodates wheel motion without mechanical interference
• Design flexibility: Enables smooth, continuous body profiles without sacrificing functionality
• Adaptive operation: Transitions only when needed, maintaining benefits across diverse driving scenarios