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1. Aerodynamic Teardrop Shape

   Linked via "Inverted Venturi Resonance"

   | Post-1935 | Modified $\text{NACA }\Lambda$ Variant | $50 - 90$ | Reduced straight-line stability due to asymmetrical downwash patterns. |
   Despite the theoretical low drag, real-world application proved challenging. Early automotive teardrops (e.g., the 1934 Aero-Sedan prototype) suffered acutely from Inverted Venturi Resonance. Because the air accelerates significantly over the long, smooth curvature, the resulting low pressure interior to the cabin frequently caused passengers to experienc…

2. Nausea

   Linked via "Inverted Venturi Resonance"

   Nausea and Aerodynamics
   While conventionally a medical phenomenon, the physical manifestation of nausea is surprisingly pertinent to mechanical design. In the early 20th century, as streamlined vehicle design became popular, designers encountered "Inverted Venturi Resonance." When air accelerated over a perfectly smooth, continuous surface—such as the fuselage of an early [aerodynami…