NASA Reference Publication 1207 August 1988

Body

Pardon me Doug for mentioning this report from NASA, but does this make sense to anyone here?

Below is my typed copy as I could not copy and paste it because it was locked. Please see the link below:

https://www.nasa.gov/centers/dryden/pdf/88104main_H-1391.pdf


NASA Reference Publication 1207  August 1988
Page 35 of 102

3     Concluding Remarks

This report derives a set of linearized system matrices for a rigid aircraft of constant mass, flying in a stationary atmosphere over a flat, nonrotating earth.  Both generalized and standard linear system equations are derived from nonlinear six degree-of-freedom equations of motion and a large collection of nonlinear observation (measurement) equations.

This derivation of a linear model is general and makes no assumption on either the reference (nominal) trajectory about which the model is linearized or the symmetry of the vehicle mass and aerodynamic properties.  (Emphasis added)




Ames Research Center
Dryden Flight Research Facility
National Aeronautics and Space Administration
Edwards, California, January 8, 1987



On page 6 of 102, it is also a copy of the above in the Summary, and in the Introduction in paragraph 2 it also mentions the stationary atmosphere over a flat, nonrotating earth, and in paragraph 3 it mentions straight and level flight.