Wow, and it's contained in its own con-di nozzle too! I gotta get me one of those...
IFMU, what i mean is that the J60 thrust would be very low at slow speeds, increasing with airspeed - this is a turbojet not the later turboshaft version. This is because the intake area is relatively small, so needs airspeed to get enough mass flow. So to get up to that speed the rotor would have done most of the work, even though the J60s were spooling themselves silly. That's why the collective at low speed is 25-30%, since the PT6s are doing most of the work. With airspeed the PT6 Q, and collective, goes down to zero as the J60 takes over providing the thrust.
PT6s and J60s are connected together by means of sitting in the same airflow.
