There are specific inherent problems usually given with wig crafts, especially the centrifugal forces when taking turns and the resistance of the water at take-off. At taking turns, the vehicle is exposed to extremely high pressure, when the profile cleaves sometimes the air, sometimes the water, at the expense of speed and safety. The same thing happens mostly with the blades of the screw and the rudder (where these are used). This causes so much resistance, that the advantage of such wig crafts is strongly reduced. Besides, the lift capacity at high speed is so small that the resistance remains high as long as the vehicle doesn't get the full speed. 
The dilemma for most wig crafts: When they  "fliy" high to avoid contact with the waves, the 'ground effect lift' decreases rapidly, they soon loose their  advantages and they  become nothing more than  bad crafts. When they  "fly" low to maintain the aerodynamic advantage, the end plates get in contact with the waves and the vehicles are  exposed to high structural charges, which strongly obstruct their  manoeuvrability and  controllability 

An other problem of most wig craft , is the fact that it appeared to be  impossible to turn at high speed. Air cushion and surface effect crafts are characterized by their large turning circle, by which their value for defence purposes decreases. If they would take the turns slantwise, just like some water vehicles, then they get  exposed to high turning forces.
An other disadvantage of most  wig designs is the fact that because they get their lift capacity aerodynamically, they do not possess an inherent floating capacity of their own. Some designs have foreseen a built-in pseudo floating lift by adding floats in order to get a kind of floating lift (in the water). These floaters, which also  mostly serve as end plates, imply the danger of water contact at high speed. 

SOLVING THESE PROBLEMS MEANS SOLVING THE PROBLEM OF ENERGY:
THE INTERNAL DYNAMICS.

If a wig craft must possess not only a high speed, but also a great stability at a high flight height and a great controllability, the only way of solving  these problems consists in solving the problem of energy. As has been said before, all forces that influence the vehicle (as well internal as external) must be seen as a whole and must be reduced into one essential energy aspect: the "Internal Dynamics", that  aim  to maintain control of the "natural centre" during the whole operation.
 

Thanks to the "Internal Dynamics" ,  THETA is perfectly controllable, has great loading capacity and remains absolutely stable at high speeds. Its energy consumption is very low, it can take off almost immediately from out ground effect, so that one immediately gets  this  "dynamic stability" and its turning circle is very small: the centrifugal forces have very little influence on the craft because the "natural centre" (*) remains under control and its controllability remains very precise, even when the turning circle is extremely small.
                        (*)The "natural centre" is the position where all forces that influences the     vehicle, are concentrated. It is a spot which is not subject to the law of casualty.

The above shown  wig craft makes it possible to avoid the very heavy logistic (bases, people, tanks, etc.) due to its extremely great radius.
Besides, it can be equipped with all sorts of the newest defence apparatus, which makes it suitable for defense purposes.
 
 

The creative use of propulsion force in the most captivating electrical field around the earth and the understanding of the specific possibilities of this field cannot be solved satisfactorily through the approach of the mechanic models and their consequent designs.
It is not the mass density of the air, which will carry these wig crafts. On the contrary, it will rather hamper the speed, the loading capacity and the stability of the vehicle. Also, the constant supply of energy brings about intervals and deviations of flight.

As has been said before, we will have to leave the mechanical laws and models to a great part. The hydrogen technology will take the place it deserves, as hydrogen is a carrier of elements, which are electrically and magnetically usable.

The differences in the composition of the underground will determine the natural height of flight. Impulses of energy can correct this by increasing the resistance pressure. 
Researchers, engineers, naval architects and designers should work together with the physicists, or rather with "practical energy philosophers".