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• 17:37, 28 September 2013 Ben (Talk | contribs) uploaded "File:Heliogyro.png" (Halley Rendezvous heliogyro solar sail. Spinning sail with long, thin blades. The blades are tilted like those of a helicopter to steer the vessel. Created 1999 by Benjamin L. Diedrich using POVRay, updated in 2013. Source file: File:Heliogyr.pov ...)