Stability analysis help for aerodynamic simulation setup

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Hoping to get some help on a stability analysis of this setup...

 
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When I was 10, I threw a paper airplane off the Empire State Building. It flew across the street and leveled out around the 30th floor of a nearby building. The plane hovered in front of a single window for 5 or 10 minutes until someone finally opened the window and shooed it away. So, the fan video doesn't look too unusual to me. :oldsmile:
 
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