Crist,
I am sampling faster than 1Hz (1s), but not as fast as possible (10Hz). With all my sensors (rpm, battery Current & Voltage, Airspeed, Altitude) , I can only hold 2 flights at a time at the lower (5Hz I think) recording rate. However your newer logger (V3) has more memory than mine, so if you track rpm, battery current &voltage, I would go at 10Hz. Remember you are flying 5s laps, so at 1Hz you would only get 5 points vs 50 points @10Hz. The higher rate will better show what is happening in the corners, vertical maneuvers etc.
To export the graph, click on the little icon on the bottom of the graph window where you can change the plot setup. When the window opens, there is an "Export" tab. CLick on that, and on chart (I think that is right, I'm doing it from memory right now). There is a button to save the graphic there as a jpeg.
One nice thing about this forum is that you can insert it without compressing to 50kB as over on SSW,