Resin transfer molded rocket motor nozzle

A rocket throat insert comprising:

• an annular body having a radially inner annular wall portion and a radially outer annular portion;
• wherein the radially inner annular wall portion has a contoured radially inner surface defining a rocket nozzle throat;
• wherein the radially outer annular portion includes an annular buttressing structure supporting the radially inner annular wall portion and defining one or more insulation gaps arranged annularly around the radially inner wall portion for restricting the radial flow of heat through the annular body;
• wherein the radially outer portion further includes a radially outer wall portion, and the annular buttressing structure is disposed radially between the radially outer and inner wall portions;
• wherein the annular buttressing structure includes an intermediate wall portion, a radially inner annular array of first supports extending radially between the radially inner and intermediate wall portions, and a radially outer annular array of second supports extending radially between the radially outer and intermediate wall portions;
• wherein the first supports and second supports are both in the form of spokes radiating away from a central axis of the annular body;
• and
• wherein the spokes each have a length in the radial direction greater than a width.