Equilibrium

Definitions

• A condition that exists within a body when the sum of the moments of all of the forces acting on the body is equal to zero. In aerodynamics, equilibrium is when all opposing forces acting on an aircraft are balanced (steady, unaccelerated flight cond
• When lift equals gravity, as in level flight. Equilibrium at launch is typically that temperature at which after the balloon has been inflated and is standing up (erect), the ground crew is able to hold the balloon in place by resting their hands lightly on the basket.

References

• Airplane Flying Handbook, Federal Aviation Administration, 2021
• Balloon Flying Handbook, Federal Aviation Administration, 2024