High temperature nozzle for rocket motor

Claim 1

A NOZZLE FOR A ROCKER MOTOR COMPRISING A STEEL HOUSING, AN INSULATOR SECURED TO THE INNER SURFACE OF THE HOUSING, A CONVERGENT-DIVERGENT PORTION FORMED FROM GRAPHITE AND COMPRISING A HEAT SINK SECURED TO SAID HOUSING WITH SAID INSULATOR POSITIONED THEREBETWEEN, A TUNGSTEN INSERT TRAPEZOIDAL IN CROSS-SECTION MOUNTED IN THE THROAT OF SAID CONVERGENT-DIVERGENT PORTION WITH THE SMALL BASE OF SAID INSERT FORMING A CONTINUATION OF THE INNER SURFACE OF THE CONVERGENT-DIVERGENT PORTION AND ADAPTED TO BE EXPOSED TO THE HOT GAS STREAM PASSING THROUGH THE NOZZLE, THE LARGE BASE OF SAID INSERT BEARING AGAINST A SURFACE OF THE HEAT SINK SO THAT A DECREASING TEMPERATURE GRADIENT IS FORMED IN THE INSERT EXTENDING FROM THE SMALL BASE TO THE LARGE BASE WHEREBY THE TEMPERATURE OF THE LARGE BASE IS LOWER THAN THE TEMPERATURE OF THE SMALL BASE, A PLURALITY OF PYROLYTIC GRAPHITE PLATES EMBEDDED IN THE GRAPHITE HEAT SINK, AT LEAST SOME OF THE PLATES BEING POSITIONED SO THE INNER EDGES THEREOF ENGAGE THE LARGE BASE OF SAID INSERT, THE CRYSTAL FORMING THE PYROLYTIC GRAPHITE PLATES BEING ORIENTED SO THAT EACH OF THE PLATES IS A GOOD CONDUCTOR OF HEAT IN DIRECTIONS PARALLEL TO THE SURFACES OF THE PLATE TO EFFECT A RAPID TRANSFER OF HEAT FROM THE LARGE BASE OF THE INSERT TO THE HEAT SINK AND THEREBY REDUCE THE TEMPERATURE OF THE INSERT AND DECREASE EROSION, THE SIDES OF THE INSERT BEING COVERD BY RESPECTIVE WASHER-SHAPED PLATES OF PYROLYTIC GRAPHITE WITH THE INNER EDGES THEREOF BEING EXPOSED TO THE HOT GAS STREAM, THE CRYSTALS IN SAID LATTER PLATES OF PYROLYTIC GRAPHITE BEING ORIENTED SO THAT EACH OF SAID LATTER PLATES IS A GOOD HEAT CONDUCTOR IN DIRECTIONS PARALLEL TO THE SURFACES OF THE PLATE AND A GOOD INSULATOR IN DIRECTIONS TRANSVERSE TO THE SURFACES OF THE PLATE, SAID LATTER PLATES COVERING THE SIDES OF THE INSERT ACTING BOTH TO COOL THE THROAT OF THE NOZZLE AND TO PREVENT HEAT FROM THE HEAT SINK FROM ENTERING THE INSERT THROUGH THE SIDES THEREOF, WHEREBY THE NOZZLE CAN BE OPERATED AT A HIGHER GAS TEMPERATURE WITH A STABLE PERFORMANCE CHARACTERISTIC.