1: tower wheel and fixed pulley between the cable is not horizontal state, act on the tower wheel cable force is not the weights of gravity, but than gravity is small, if the cable and the horizontal direction of the angle of A, then the force to make the tower rotate the force of the weights of gravity multiplied by the cosA. when you are still using the original gravitational force, of course, to get the inertia of rotation will be become larger

2: fixed pulley and the choice of the radius of the tower wheel is not perpendicular to the above situation is very similar, you should be able to get a little analysis of the conclusion