Ultralights have done many spectacular things, including topping Mt. Everest and crossing the English Channel. Gerard Thevenot flew the Channel under a La Mouette wing powered by an Eck/Geiger motor driven by three fuel cells in 2009 – six years before the recent flights with faster electric craft. For that matter, Paul MacCready and his team flew a solar-powered aircraft from near Paris to an RAF runway on the eastern English coast in 1981. Hang gliders, paramotors, and other rigid and non-rigid-wing craft might benefit from new sailcloth that incorporates flexible solar cells into its makeup. Used on sailboats, the solar fabric helps run auxiliary motors and can help extend the cruising range of a boat when the sails are furled. A French company named UK Sailmakers France has started a new company, SolarClothSystem®, to make mainsails with “a film containing high efficiency photovoltaic cells.” The solar cells can be used on sails that will be rolled or folded, as …