Stiffening the blades as much as you want won't help as long as they are attached to the mast via a hinge. What you are describing is more like a rigid rotor system, but I don't think this works on a two-bladed system for the lead-lag reasons already given.. .. .To work as you suggest, it would be possible to lift the helicopter via the blades when they were not going round - i.e. you would have to have a rigid connection between the blades and the mast, and blades of sufficient strength to act as a beam. These would be much too heavy.. .. .Vertical force is transmitted to the mast by the blades being in tension. Thus the amount of vertical force transmitted form each blade is equal to [Tension]*[Sin of coning angle]. Coning angle = 0 gives no vertical force transmitted to the mast.