Question 1 - Answer each question briefly in no more than 2 sentences. Equations are not necessary, but may be used.

a) How does nonlinear elasticity influence the lift distribution?

b) Does the rigid body angle of attack affect the control reversal speed?

c) Given a flexible wing. Define the divergence and control reversal speeds. Are these related to each other?

d) Can one vary the value of the divergence speed without affecting the other one? Explain briefly.

e) What are the differences and similarities, if any, between wing span wise bending and chord wise bending?

Question 2 - Given a wing in level flight with a trapezoidal plan form as shown in the Fig. Mass, material properties and moments of inertia are all functions of y - the span-wise coordinate. Additionally, material properties and lift are both nonlinear functions of the deflections. Do not include chordwise or in plane bending in your answers. Write the differential equations for the static conditions for the twist θ(y) and the bending deflection w(y).

a. State all applicable boundary conditions.

b. Indicate, but do not solve, how you would solve the nonlinear DEs for w(y) and θ(y). Conceptual answers only, no detailed manupulations of equations to be written out.

c. Indicate, but do not solve, how you would proceed to determine the steady-state torsional divergence speed. Conceptual answers only, no detailed manupulations of equations.