2008 Power Beaming Competition
The competition requires you to build a climber with the specs that follow:
"net weight is limited to 50 kg [110 lbs], and they must ascend the ribbon at a minimum speed of 2 m/s. [6.6 feet per second] carrying as much payload as possible. A high performance prize will be awarded to teams that can move at 5 m/s. [16.5 fps]"
Remember, this must be solar powered. Doesn't matter who wins this is an interesting engineering project, can't wait to see what people come up with.