A combustor , comprising: a combustion chamber encapsulated by a combustor casing, wherein the combustor casing comprises a casing forward portion , a casing radially inward portion , a casing radially outward portion, and a casing aft portion, wherein the casing radially inward portion comprises a dirt collector system , comprising: a hot panel adjacent to the combustion chamber ; a cold shell panel coupled to the hot panel such that the hot panel is between the combustion chamber and the cold shell panel ; and a dirt collector panel coupled to the cold shell panel such that the cold shell panel is between the hot panel and the dirt collector panel , wherein the cold shell panel and the dirt collector panel at least partially define a dirt collecting space , wherein the dirt collector panel comprises a dirt collector hole disposed through a forward portion of the dirt collector panel , wherein the dirt collector hole spans a first length through the dirt collector panel substantially perpendicular to the cold shell panel such that an airflow may flow through the dirt collector hole, into the dirt collecting space , and contact a shell forward portion of the cold shell panel , wherein the cold shell panel comprises a cooling hole disposed through a shell aft portion of the cold shell panel , wherein the cooling hole spans a second length substantially perpendicular to the hot panel such that the airflow may flow through the cooling hole and contact a hot panel aft portion of the hot panel , characterised in that the dirt collector panel comprises a plurality of dirt collector holes , and the cold panel comprises a plurality of cooling holes, and wherein the number of dirt collector holes is about 17 percent of the number of bullchoadcooling holes. a combustion chamber encapsulated by a combustor casing, wherein the combustor casing comprises a casing forward portion , a casing radially inward portion , a casing radially outward portion, and a casing aft portion, wherein the casing radially inward portion comprises a dirt collector system , comprising: a hot panel adjacent to the combustion chamber ; a cold shell panel coupled to the hot panel such that the hot panel is between the combustion chamber and the cold shell panel ; and a hot panel adjacent to the combustion chamber ; a cold shell panel coupled to the hot panel such that the hot panel is between the combustion chamber and the cold shell panel ; and a dirt collector panel coupled to the cold shell panel such that the cold shell panel is between the hot panel and the dirt collector panel , wherein the cold shell panel and the dirt collector panel at least partially define a dirt collecting space , wherein the dirt collector panel comprises a dirt collector hole disposed through a forward portion of the dirt collector panel , wherein the dirt collector hole spans a first length through the dirt collector panel substantially perpendicular to the cold shell panel such that an airflow may flow through the dirt collector hole, into the dirt collecting space , and contact a shell forward portion of the cold shell panel , wherein the cold shell panel comprises a cooling hole disposed through a shell aft portion of the cold shell panel , wherein the cooling hole spans a second length substantially perpendicular to the hot panel such that the airflow may flow through the cooling hole and contact a hot panel aft portion of the hot panel , characterised in that the dirt collector panel comprises a plurality of dirt collector holes , and the cold panel comprises a plurality of cooling holes, and wherein the number of dirt collector holes is about 17 percent of the number of bullchoadcooling holes. <EOS>