A method for designing and manufacturing wheels that are simultaneously: a turbine, a propeller with blades that are hollow along the entire length thereof and which lead into peripheral circular chambers that operate as a powered engine (THRA), characterised in that for each turbine-propeller-engine assembly (THRA), this method makes it possible to build with strips the scalable section of the inner channel of the propeller blades, which are hollow along the entire length thereof, and rest on the profiles of the neutral fibres of the strips that are mostly portions of circles, and which are built for the turbine inlet and for the hollowed propeller blade inlets and where they arrive at the chambers, and are individually configured by giving initial values to the basic geometric elements, and are traced according to particular geometric arrangements, on circular plates with different diameters, which are then arranged at a plurality of levels on the wheel and are positioned at an angle on the same axis independently from one another, wherein the particular arrangement of the basic geometric elements applied to each circular plate is obtained by being inscribed within a circle from the centre of which extends a radius of a given numerical value that meets the circle at a preferred intersection point, the circle is the surface of revolution that is swept by the leading edge of the strip during the rotation of the wheel, another numerical value is given to the chord of the arc which is the portion of the circle of the neutral fibre of the strip in question, One of the ends of this chord starting from the preferred intersection point and the other being positioned inside the circle on an axis that starts from the preferred point and forms an angle of 45° with the radius, the position chosen for this axis on the right or the left of the radius determines the desired direction of rotation of the wheel (1 or 2), and another point is placed on the radius towards the centre and located at a numerical value which is that of the radius of the circle that surrounds the wheel minus a numerical value that is the square root of the sum of the square of two 1⁄2 chords (Pythagoras), a straight line with a numerical value identical to that of the chord extends from point, such that its midpoint aligns with the midpoint of the chord to which it is perpendicular, and generates a point at the other end thereof, the point located on the radius serves as a centre with a numerical value equal to that of the straight line (A B) for the portion of the circle that stretches between the two ends of the chord (A and E), which is the arc thereof and which is the circular profile of the strip in question, and the point located on the other end of the straight line that intersects the chord at its midpoint serves as a centre for tracing the portion of circle that stretches between the two ends of the chord (A and E), which is also the arc thereof and which is the other symmetrical circular profile of the strip in question, characterised in that other centres of circles located on the perpendicular straight line (B D), which have larger or smaller diameter values than points B and D, optionally allow them to stretch between the ends of the straight line (A E), and to generate portions of circles that have flatter or more curved profiles (PL1, PL2), but which may also benefit from this method, the portion of circle is not connected to points A and E, since the straight line (A E) is also a strip profile that can be used, characterised in that the profiles built using this method and with the same numerical values on each side of the radius are symmetrical, the mixing of the strip profiles obtained with this method makes it possible, by changing the parameters, to build scalable blades that have specific characteristics, characterised in that the numerical values of the profiles of the neutral fibres built according to this method are mathematically quantifiable, and characterised in that a single wheel can use different turbine strip profiles and different hollow propeller blade strip profiles that are defined using the same method but with different profiles on the same wheel.