Fig. 12. Results of a Monte Carlo simulation in which the six static stability derivatives were allowed to vary as normally distributed variables, according to the parameters set by the regression analyses. The analysis was repeated 5000 times for each locust, recalculating the eigenvalues after each iteration. Each Argand diagram plot contains 20 000 points: 5000 for each of the four roots. (A) Locust `R'. (B) Locust `G'. (C) Locust `B'. The plots show that the complex conjugate roots (represented by the clouds of points for which 0) are stable (i.e. n<0) in 100% of cases for locusts `R' and `G', and are stable in 99.9% of cases for locust `B'. There are two real roots, one positive and one negative, in 100% of cases.

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