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.