| 摘要 |
A leading edge airfoil 7, intermediate airfoil 9 and trailing edge airfoil 11 are provided to reduce drag on a truck towing or carrying at least one bluff body as a load. The leading edge airfoil 7 has a curved nose 23 and an upper surface angled away from the curved nose, and may have a rear part of the upper surface substantially aligned with an upper surface of the most forward bluff body, to assist in attaching oncoming airflow to the upper surface of the most forward bluff body. The intermediate airfoil is configured in use to direct airflow over the gap between two bluff bodies and toward the upper surface of the most rearward of the two bluff bodies. The trailing edge airfoil is configured to reduce the area and volume of the load's turbulent flow in use. The airfoils may be provided individually or as a set.
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