New link to tumblewing build and fly videos by sciencetoymaker.org!
Cut two strips of light newsprint paper of dimensions 1"X4" and 2"X8" (same aspect ratio, different sizes) and make tumblewings out of them. Measure their rotation rates by making a video of each as it falls. Use frame by frame analysis to count how many frames per rotation (or half rotation). I used quicktime.
To prove the effect of the aspect ratio of the tumblewing paper strip, cut two more strips of light newsprint paper of dimensions 10"X2" and 5"X2" (different Aspect Ratios, same widths) and again measure their rotation rates. What affects the rotation rates more, the aspect ratio or the width of the paper strip?