The navion is a small light aeroplane of conventional layout and in a low speed level flight condition, the coefficients of the dimensionless lateral-directional stability quartic are given by 4b23c2? +d2^ + e2 = 0 where b2 20.889 c2 46.714-k d2 115.120 - 18.636k, e2 55.570 + 1.994k, and ky =- i- the lateral relative density parameter /i2= 11.937, and the dimensionless moment of inertia in yaw i0.037. the quartic factorises to e2 |( kiak2)= 0 d2 (а+ b2) show that if the fin were made too large, the aircraft would become dynamically unstable what would happen to the aircraft if a critical value were exceeded?