PROPELLER DEVICE FOR LAND AND/OR MARITIME TRANSPORTATION BASED ON THE MAGNUS EFFECT

The present invention refers to a structure (1) of prefabricated staircase formwork for the manufacture of a stair section, which comprises: a first space (A) for containing a concrete pouring, which is defined by two longitudinal beam elements (11, 12) parallel therebetween, and two transversal beam elements (13, 14) also parallel therebetween, which are coupled to the end portions of both longitudinal elements (11, 12); a plurality of profiled elements (15), each one defining a second contention space (S) for pouring concrete in the corresponding steps, where said profiled elements (15) are sequentially fixed over the longitudinal beam elements (11, 12); an element (16) for closing the lower portion of the formwork structure (1) and fixed to the longitudinal and/or transversal beam elements in opposite sides with regard to said profiled elements (15); and a structure (C) for reinforcing the concrete housed in said contention space (A). The present invention refers to a structure of prefabricated staircase formwork for the manufacture of a recess, which comprises: two longitudinal beam elements and two transversal beam elements that are coupled to said longitudinal beam elements, which define a contention space for pouring the concrete; an element for closing the lower part of the formwork structure, which is fixed to said longitudinal and/or transversal elements; and a reinforcement element for the concrete poured in said contention space. La invención se refiere a una estructura (1) de encofrado de escalera prefabricado para la realización de un tramo de escaleras que comprende: un primer espacio (A) para contener un vertido de hormigón definido por dos elementos (11, 12) de vigueta longitudinales, dispuestos paralelos entre sí, y dos elementos (13, 14) de vigueta transversales dispuestos también paralelos entre sí, y cada uno acoplado con dichos ambos elementos (II, 12) longitudinales mencionadas en sus respectivos extremos; una pluralidad de elementos (15) perfilados, cada uno de los cuales define un segundo espacio (S) de contención para un vertido de hormigón de las etapas correspondientes, estando dichos elementos (15) perfilados fijos en sucesión encima de dichos al menos dos elementos (11, 12) de vigueta longitudinales; un elemento (16) de cierre de la parte inferior de la estructura (1) de encofrado, fijo a dichos elementos de vigueta longitudinales y/o transversales en lados opuestos con respecto a dichos elementos (15) perfilados; y una estruc