Sisyphus
A vehicle is driven by means of a rotor. The rotor is so big, that it screens the whole vehicle. From its central axis an axle protrudes bearing a fin at its end. The fin assures that the object is directed ever against the wind. The whole thing is put on an underlying round pane which is pivoted. Whenever the vehicle is on the verge to fall off the pane, the pane will swerve with the object out of the wind. So far for the scheme. Finally, the rotor was chosen to be somewhat smaller and the pane was slanted for the vehicle's weight to supply swerving impetus. Sisiphus now, as in the myth, is incessantly and vainly climbing uphill.
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