Abstract: The invention relates to a jet propulsion engine, especially for watercraft, comprising a rotor (1) on the inside of which blades (2) are disposed, and a housing (3) in which the rotor (1) is rotationally received. The bearing system between the rotor (1) and the housing (3) is produced from carbide that is resistant to sea-water. (57) Zusammenfassung: Die Erfindung betrifft einen Strahlantrieb insbesondere für Wasserfahrzeuge mit einem Rotor (1), an dessen Innenseite Schaufeln (2) angeordnet sind und einem Gehäuse (3), in dem der Rotor (1) drehbar gelagert ist, wobei die Lagerung zwischen Rotor (1) und Gehäuse (3) seewasserfestes Carbid aufweist.

Abstract: A molded thermal insulator body, in particular a thermal insulator plate comprises, for the purposes of a better flexibility, a prepressed base body (1) substantially containing at least one center layer (3), predominantly made of a highly dispersed ceramic material such as silica aerogel (SiO.sub.2), and an upper and a lower support layer (2), predominantly made out of flexible paper, foil, cardboard, or felts of ceramic material, or of a mixture of at least two of the same, preferably of ceramic paper, foil or cardboard, and wherein the base body is enveloped by a shrinkable plastic foil (4).

Abstract: A jet propulsion drive element is disclosed for the increasing of the power yield of jet engines, in particular for watercraft, employing a rotary-driven jet propulsion pipe (11). A thrust propulsion element is disposed at the inner jacket of the jet propulsion pipe (11), covers an outer annular face (A), and is formed as a screw (17). The outer edge of the screw (17) is connected to the inner jacket of the jet propulsion pipe (11). The edge screw (17) is furnished with a through borehole, such that a part of the fluid entering into the jet propulsion pipe (11) is not directly accelerated by the edge screw (17). In addition, drive elements such as a screw propeller (18) can be furnished at the outer jacket of the jet propulsion pipe (11). The invention structure can be employed also for circulating pumps in addition to applications in aircrafts.