My one great passion is flying. It's satisfying on several levels - just being up there has to be the greatest reason, but there's also the satisfaction of being in control of all the flight dynamics, and then there's the technical satisfaction of understanding aerodynamics, weather, navigation, navaids, instruments etc. I remember my first solo, back in 1987. I had previously flown ultralights from a farm, but landing after having done your first solo in a Piper and having the tower give you clearance to cross runways and their congratulations on first solo in the same call - that was a special moment. I've flown many hours since then, yet the enjoyment never diminishes. I find bumpy weather more exciting. I remember before gaining my license, an 18yo instructor checking me out for cross-wind landings, in a busy circuit with a lot of tower calls. There was only time for a few circuits as a storm front was approaching. On take-off I'd kick the rudder so the plane would fly straight, despite pointing some 20 degrees off the centreline. With the approaching storm, the wings were all over the place. Around the circuit we'd go and line up the runway, again pointed some 20 degrees off the centreline, then a kick of the rudder just before touchdown. We did 4 circuits like this and I was loving it. The instructor looked at me as the winds tipped us one way then another and said, "You're enjoying this, aren't you?" With a big grin, I said yes. That's when he ticked the sheet and signed me off. From the aerodynamics, I learned about how the curved foil creates the pressure differential. But years later, talking to a US Airforce pilot who later became an airline pilot explained that in advanced aerodynamics, they learn that lift is also created by the vectoring of air against the raised wing (as in take-off). He was fascinating to talk to. I've also spent a bit of time with MS Flight Simulator. Had some interesting discussions there. FS2002 apparently used a very realistic model, that was "trimmed" in FS2004. For example, in FS2002, they modeled the aerodynamics of wings at several points (root, middle, tip etc), whereas in FS2004, they changed it to something like an average over the whole wing, for the sake of processor performance. Anyway, that's my great passion. Any other pilots out there?