My first idea was to find a way to make some kind of directional dry adhesive like the Stanford gecko robot
http://nanolab.me.cmu.edu/projects/geckohair/ but although i thing it is possible would take a bit of time. So I started to think of something different that would do the same thing but simpler and sense there has been much talk of plungers/suction cups on chiefdelphi. I thought that a belt lined with many small plungers like the ones found in kids plastic gun toys may be a test worthy approach that may be able to lift a Frisbee from the top. Here is a link to the kind of suction cup i mean
http://www.acrylicdesign.co.uk/produ...ms%5Bid%5D=260