My son Mark Howell has been working on a 1.5x size Superfan project for the past year at the local university. He was asked to participate in the "Earth Day" activities on campus a couple of weeks ago to demonstrate alternate forms of solar energy. The idea is to power the fan by using a large magnifying glass, thus of transforming solar energy to mechanical energy (they did this outside - not in photos). Also in the photos are Dad's original Superfan, Miser, and mini-Miser.
Here's a youtube video of the project: