As I was taxiing through the Aviat gate on the north end, I heard a Cessna pilot announce he had just started to back taxi from mid field, to take off on 34, I was all warmed up and ready to go, so I asked him if I had time, how far along the taxi he was, to take off on 16 as I was right there and cocked and loaded. He responded he would be several minutes, or word to that effect, and 10 seconds later at most I was off and climbing out. About mid field and 4-500' up, I eyeballed him still a couple hundred yards from where he would start his run up, and thought "that went good, I'd been sitting there for 5 minutes at least waiting on him," and then a yellow RV of some type went under me, directly under me with no offset. The Cessna pilot remarked on it, as did I,
If he's reading this, nah..., not going to go there, he knows he screwed the pooch, and I will for sure take some blame for somewhat being lulled into a sense of complacency after clearly communicating with the C driver and both of us not seeing or hearing anyone else in the pattern. Both of us assuming we were the only active aircraft there, and we had it all figured out. I don't recall clearly if I actually eyeballed the end of the runway for opposing traffic, my usual habit, before taking off. Probably not, wanting to get up and out way before the C guy, that's the complacent part. I'm also not sure, IF the RV was positioned for takeoff if I could have seen him, as the runway has a bit of a slope, not much but not level. The C guy and I both assumed the RV'r had a radio issue of some kind, or maybe was on the wrong freq. Turns out I was safer on the 8600' ridge landing I had made a few minutes earlier then at the paved airport. What pisses me off, is I almost always immediately offset my path off the center line after takeoff, an old habit from when I had unreliable engines (ultralights), to make a possible turn around easier, in this case that practice would have offset us instead of nosed to nosed us. Nice flight otherwise.

