Thrustcurve shows slightly higher total impulse for the C5 (9.1 vs. 8.8 N-s), slightly shorter burn time (1.7s vs. 1.9s), slightly higher average thrust (5.3 N vs. 4.7 N), and significantly higher max thrust (21.9 N vs. 14.1 N). Yeah, I'm too lazy to create a table. So basically, it's stronger than the C6 in all regards, with only slightly shorter burn (assuming the Thrustcurve data tells an accurate tale). I would probably use it instead of C6's in all my larger/heavier 18mm rockets, since I would *always* like to get more speed off the pad to reduce weathercocking. Does anyone know why the C5 was discontinued instead of the C6 in the first place?