Our airplanes use vertical stabilizers, why? And the masters of the air (birds) don't. Birds are very efficient compared to our man made birds, taking into consideration the energy they use to fly vs the energy our airplanes use, birds win by a long shot.
The recommended video: NASA's Albion H. Bowers - "Why Birds Don't Have Vertical Tails"
• NASA's Albion H. Bowers - "Why Birds ...
The project - NASA Prandtl Wing: https://www.nasa.gov/centers/armstron...
and https://www.nasa.gov/centers/dryden/F...
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