Chapters 1 to 4 discussed the importance of the rocket propulsion in the first 50 years of spaceflight, and its limitations with respect to what space-faring nations (augmenting in number and quality) would want to accomplish in the solar system and beyond. Chapter 5 discussed the concept of sailing, first on Earth seas with conventional sailboats, then by extending the concept to space; there, the first similarities and differences between sea sailcraft and space sailcraft were emphasized. Chapter 6 detailed the principles of space sailing. Now we discuss what a space sail actually means through the great impact it can have on the design of the different systems, which is not as obvious as it might seem.
KeywordsSail System Total Solar Irradiance Solar Sail Astronomical Unit Deep Space Network
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