Dual propeller assemblies for driving engagement by a propeller drive shaft may include at least two propellers having a forward propeller and a rear propeller rearwardly of the forward propeller. The forward propeller may include a forward propeller hub with a forward propeller hub wall having a forward propeller hub outer diameter. A forward propeller hub bore may be formed by the forward propeller hub wall and configured to receive the propeller drive shaft for driving engagement of the forward propeller hub thereby. The forward propeller hub bore may form a passageway for flow of exhaust gas configured to traverse the forward propeller between the propeller drive shaft and the forward propeller hub wall. The rear propeller may include a rear propeller hub with a rear propeller hub wall having a rear propeller hub outer diameter less than the forward propeller hub outer diameter of the forward propeller hub wall of the forward propeller hub. A rear propeller hub bore may be formed by the rear propeller hub wall. The rear propeller hub bore may be configured to receive the propeller drive shaft for driving engagement of the rear propeller hub thereby. The passageway for flow of exhaust gas may be configured to traverse the rear propeller hub wall exterior to the rear propeller hub bore of the rear propeller hub.