| 摘要 |
The present invention relates to an apparatus for reducing drag of an aircra ft utilized in combination with an aircraft surface, where the local airflow ha s an upward momentum due to the free air stream being deflected upward by the aircraft surface. The apparatus comprises an ancillary airfoil having a cambered top surface, a leading edge and a trailing edge and a generally concave lower surface; mounting members for mounting the ancillary airfoil above the aircraft surface in a spaced apart manner an d at a positive angle of attack with respect to the local airflow; and an expansion chamber formed between the lower surface of the ancillary airfoil and the aircraft surface. The expansion chamber is located where a distance between the lower surface of the ancilla ry airfoil and the aircraft surface gradually increases.
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