Overlap the edge of the cloth over your snake-circle and sew the flap down. Try experimenting with different sizes of Floppy Flyer Frisbees. Try using different materials for the Floppy Flyer Frisbee. Try using different amounts of plasticine. The effects of lift are all around us.
Birds fly because of lift.
Air travels faster over the top of a wing because it's rounded. This means that the air has farther to go over the wing than under the wing where it's flat, so the air moving over the top goes faster. Pilots work with lift all the time. They can vary the degree of lift by extending or retracting flaps on the plane's wings. Lift even affects race cars, but in this case lift is a problem.