Inertia coupling is a potentially lethal phenomenon of high-speed flight in which the inertia of the heavier fuselage overpowers the aerodynamic stabilizing forces of the wing and empennage. The problem became apparent as single-engine jet fighter aircraft were developed with narrow wing spans that had relatively low roll inertia, relative to the pitch and yaw inertia dominated by the long slender high-density fuselage.
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“What is wrong with priests and popes is that instead of being apostles and saints, they are nothing but empirics who say “I know” instead of “I am learning,” and pray for credulity and inertia as wise men pray for scepticism and activity.”
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