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Small Unmanned Aircraft by Timothy W. McLain, Randal W. Beard

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4

Forces and Moments

The objective of this chapter is to describe the forces and moments that act on a MAV. Following [5], we will assume that the forces and moments are primarily due to three sources, namely, gravity, aerodynamics, and propulsion. Letting fg be the force due to gravity, (fa, ma) be the forces and moments due to aerodynamics, and (fp, mp) be the forces and moments due to propulsion, we have

Image

where f is the total force acting on the airframe and m is the total moment acting on the airframe.

In this chapter, we derive expressions for each of the forces and moments. Gravitational forces are discussed in section 4.1, aerodynamic forces ...

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