Patent Number: 041475909
Section: claims

1. Nuclear propulsion apparatus comprising: a. means for compressing incoming air;  b. nuclear fission reactor means for heating said air;  c. means for expanding a portion of the heated air to drive said compressing means;  d. said nuclear fission reactor means being divided into a plurality of radially extending segments;  e. means for directing a portion of the compressed air for heating through alternate segments of said reactor means and another portion of the compressed air for heating through the remaining segments of said reactor means; and  f. means for further expanding the heated air from said drive means and the remaining heated air from said reactor means through nozzle means to effect reactive thrust on said apparatus.  a. means for compressing incoming air;  b. nuclear fission reactor means for heating said air;  c. means for expanding a portion of the heated air to drive said compressing means;  d. said nuclear fission reactor means being divided into a plurality of radially extending segments;  e. means for directing a portion of the compressed air for heating in one direction through alternate segments of said reactor means and another portion of the compressed air in the opposite direction for heating through the remaining segments of said reactor means to balance fluid forces on said reactor means;  f. means for further expanding the heated air from said drive means and the remaining heated air from said reactor means through nozzle means to effect reactive thrust on said apparatus;  g. said nuclear fission reactor means being a right circular cylinder in shape with the cross sections of said segments being circular sectors; and  h. pressure vessel means enclosing said segments to permit maintenance of circle arc geometry when the radius of said reactor means changes as a result of thermal growth. 2. The apparatus of claim 1 in which the partially expanded air from said drive means is further expanded through an annularly disposed thrust nozzle and the remaining heated air directly from said reactor means is expanded through a central thrust nozzle. 3. The apparatus of claim 2 in which the heated air for said drive means is derived from reactor means segments with air flow in one direction and the remaining heated air is derived from the remaining reactor means segments in the opposite direction. 4. The apparatus of claim 3 in which a portion of the compressed air prior to heating is mixed with heated air about to be expanded in said drive means. 5. Nuclear apparatus comprising: 6. The apparatus of claim 5 in which said pressure vessel means consists of multi-layered, thin-walled arc-shaped wall sections at the periphery of each reactor segment and resilient joint means located at adjoining reactor segments to interconnect adjoining wall sections. 7. The apparatus of claim 6 in which the fuel for said reactor means consists of tube-like elements extending parallel to the axis of said reactor means and in the direction of air flow through each said segment. 8. The apparatus of claim 7 in which the downstream end of each segment is provided with means to support said fuel elements against movement caused by fluid pressure. 9. The apparatus of claim 8 in which said support means includes a grid-like lattice structure and means to cool said structure and prevent overheating of the reactor end support structure. 10. The apparatus of claim 9 having air-cooled shielding means surrounding said pressure vessel means. 11. The apparatus of claim 5 in which said reactor means is provided with a hollow hub and means within said hub for exercising control over the reactivity of said reactor means. 12. The apparatus of claim 5 having means for directing air flow as aforesaid, said ducting means performing the additional function of providing some shielding for said reactor means.