Air vehicles and associated aerodynamic structures are provided which include ridged solar panels to both reduce the drag and increase the solar energy harvested by the solar panel. The air vehicle may include an airframe and a solar panel carried by the airframe and defining an exterior surface thereof. The solar panel may include a plurality of ridged structures extending in a lengthwise direction. The ridged structures may be arranged such that a majority of the airflow over the exterior surface flows in the lengthwise direction. The plurality of ridged structures may include a plurality of lengthwise extending projections spaced about by respective valleys.