| 摘要 |
A device used in a ducted fan (shrouded propeller or similar axial flow, air moving producer) that's positioned on or about the ducted fan so as to disrupt or distort the subsequent laminar airflow induced by said air moving producer. The said device would, when actuated rapidly and precisely increase or decrease proportionately the resultant net thrust/airflow without varying the fan/propellers RPM.
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