Yeah, there was another thread on ROF a while back. As an experiment, I mapped (through my stick software), the secondary fire button to be a single key press and release of .01 seconds, and the YakT would rattle off between 1 and 3 rounds, whereas the 109 with the 30mm would fire only a single round. Didn't check anything else that I remember, but the Yak 37mm's unpredictable bursts surprised me.