I did both days with the quest velomobile. The rain didn't bother me too much as I didn't get wet at all. It did slow my pace a bit however. Saturday I ended up with a 24.8mph average while sunday was a 22.7 average. 3 tire tracks plus rain droplets all over the shell hurts the aerodynamics a bit plus all the droplets add up to almost a pound of extra weight. Riders were shouting that they would glady trade bikes as I went by. Here is a clip from last year riding with another velomobile. We were really gettin it in this clip.
http://youtu.be/xaxfgUA8FYY