Tier 2 thruster stick [video with 9 kills]
WATCH THE VIDEO BEFORE RATING!!!!
This thing uses the massive ignorance that tier 2 has against flyers to get 3-5 kills per match, or even more sometimes (watch the video, I got 9 kills in one match). It can handle taking about 5 smg shots and still fly properly.
You can directly convert it to tier 3 by putting a tier 6 plasma on it.