So, it's been a while since I've posted up photos, but I got the Flanger done in time for the Open Streets Festival in Corvallis. It was a big hit!
I had to learn how to work with hydraulics in order to hook up the drive pump and motor. The bicycle in the foreground in the last picture has a hydraulic pump on it, driven by the rear wheel. That pushes fluid through a hydraulic hose to the drive motor at the center. As the bikes gain speed, they fling out. Unfortunately, I had the hoses made a little short, so they pull tight when the riders go too fast, but that's easy to fix with longer hoses.
The Flanger took up most of my spare time over the past few months, so I am now back to working on other projects.