reinforced concrete mass the entire tower 12 is thus rotatable about such internally fixed support rail 50 not shown in fig1 an upper portion of the main body 32 of the tower 12 is defined by a rotor swept portion 27 the rotor swept portion 27 of the tower 12 is herein defined as that tower area most adjacent to and spaced immediately behind the spinning rotor 14 for optimizing efficiency main body 32 may have a non uniform cross section fig2 to accommodate any demanded azimuthal orientation of the tower 12 to the extent that the tower may in real time be rotatably and hence angularly yawed according to prevailing wind direction such non uniform cross sections may allow use of reduced amounts of materials for construction for example the use of an airfoil shape has been demonstrated to permit employment of smaller tower cross sections in a direction normal to the wind continuing reference to fig1 the tower 12 has a cone shaped or flared bottom portion 34 situated immediately above its base 26 to accommodate transition from the non uniform cross section 36 fig2 of its upper main body 32 to a circular cross section at its base 26 referring now specifically to fig2 the non uniform cross section 36 of the main body 32 of the tower 12 is depicted as having an aerodynamic or airfoil shape as shown the aerodynamic shape has a minor axis xx situated orthogonally to wind direction arrow w and a major axis yy situated parallel with the wind the major axis yy has a greater dimension than the orthogonal to the wind minor axis xx as earlier noted the use of non uniform including aerodynamic shapes may require use of less tower construction.