System for multiple burns from a rocket motor

A decompressive extinguishing plug nozzle, comprising:

• an outer cowl, wherein shelves formed in the outer cowl define a track along which a wheel bearing is configured to traverse;
• a plug;
• a plug housing that houses the plug;
• a plug seal;
• and
• a mechanically variable throat at least partially defined by the outer cowl and the plug, wherein traversal of the wheel bearing along the track is configured to cause movement of the outer cowl relative to the plug thereby transitioning the decompressive extinguishing plug nozzle from a sealed configuration to an active configuration, wherein the mechanically variable throat defines a choked sonic flowpath in the active configuration, and wherein the plug seal is configured to seal against an inside of a rocket body downstream from a combustion chamber.

A decompressive extinguishing plug nozzle, comprising:

• an outer cowl, wherein shelves formed in the outer cowl define a track along which a wheel bearing is configured to traverse;
• a plug;
• a plug housing that houses the plug;
• a plug seal, wherein the plug housing is connected to the plug via the plug seal, and wherein the plug seal is configured to seal against an inside of a rocket body downstream from a combustion chamber, and
• a mechanically variable throat at least partially defined by the outer cowl and the plug, wherein traversal of the wheel bearing along the track is configured to cause movement of the outer cowl relative to the plug thereby transitioning the decompressive extinguishing plug nozzle from an active configuration to a decompressive configuration, wherein the mechanically variable throat defines a choked sonic flowpath in the active configuration, and wherein the mechanically variable throat is also defined in part by the plug housing.