from escaping from the gas path between adjacent flaps in operation to deploy the flaps from the position shown in fig4 for reducing the size of the throat of the nozzle at the juncture of the divergent and convergent flaps and changing the c d configuration the actuators 46 are actuated by fuel not shown in a well known manner which causes the actuator connecting rod 86 to move toward the right at the same time the pressure from the fan discharge air depicted by arrows b which is admitted through a plurality of holes 90 spaced around the circumference one being shown causes the pbsr 30 to add to the force produced by actuator 46 this force is transmitted to the fulcrum 32 via the linkages as described above the fulcrum 32 in turn positions the flaps to the desired c d configuration hence pressure balancing is achieved by virtue of the fan air pressurized piston and since the piston is in reality a synchronizing ring which is attached to all of the convergent and divergent flaps the necessity of the balancing flaps disclosed in the prior art is eliminated this obviously results in a shorter c d exhaust nozzle and requires fewer parts since the divergent flap links 66 are.