초록 ▼

A thin frangible cork barrier conforming to the contour of the burning surface of individual solid propellant grains in a multiple grain rocket motor prevents premature ignition of the protected grain by the heat of combustion of previously ignited adjacent grains and is expelled through the rocket

A thin frangible cork barrier conforming to the contour of the burning surface of individual solid propellant grains in a multiple grain rocket motor prevents premature ignition of the protected grain by the heat of combustion of previously ignited adjacent grains and is expelled through the rocket motor nozzle upon ignition of the protected grain. In a second embodiment, the thermal protection afforded by the frangible cork barrier is augmented by bonding to a thermally-protective elastomer layer which is in turn bonded to the propellant grain burning surface. By virtue of the composition and structure of the embodiments, thermal protection is afforded. Upon ignition of a protected grain the thermal barrier breaks up so as to pass readily through the throat of a small motor nozzle.

대표청구항 ▼

Thermal protection for use with a protected grain of a multiple grain solid propellant rocket motor having a single combustion chamber and thrust nozzle, comprising: a flexible frangible barrier layer of pressed granular material held together by a binder material and bondable over the combustion su

Thermal protection for use with a protected grain of a multiple grain solid propellant rocket motor having a single combustion chamber and thrust nozzle, comprising: a flexible frangible barrier layer of pressed granular material held together by a binder material and bondable over the combustion surface of the protected grain said layer comprising means for preventing ingition of said combustion surface by the burning of an adjacent propellant grain and means for fracturing into small pieces to be propelled out through the thrust nozzle on ignition of the protected grain, and means for bonding said barrier layer over the entire area of said protected grain surface.