Hand written solution required

Q7. (a) Give a brief physical explanation of the cause of each of the following derivatives. State whether each is positive or negative. One or two sentences and a quick sketch will suffice. No equations are necessary. (1) L, [2 marks] (ii) N. [2 marks] (b) Discuss the significance of the result that the slow spiral mode will be stable if LN, > LN. You might find it useful to refer to the approximate factorisation of the lateral/directional characteristic quartic AX + BX' + CX' + DA + E = a(A2 + B) x + Ca+> >+5-o The coefficient E is given by E = LH2 ( LN. - L, N. ) and the coefficient D is positive. [8 marks]