Rocheworld

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And you can see more from Display Cabinet Lighting LED Up Light Fire Rated Light 20W Halogen Bulbs Lighting Floor Lamp 12 Volt Lighting Circular Fluorescent Bulb Full Spectrum Bulb Laser Show Light Rocheworld (1985), also known as The Flight of the Dragonfly (1984) is a science fiction novel by Robert Forward in which he uses a light sail propulsion system to set the crew on an interstellar mission. The spaceship and crew of 20 have to travel 5.9 light-years (ca. 34 trillion miles; ca. 56 trillion km) to the double planet that orbits Barnard's Star, which they call Rocheworld.Its sequels include Return to Rocheworld, Marooned on Eden, Ocean Under the Ice, and Rescued from ParadiseContents1 Plot 2 Forward's Light-Sail Propulsion System 3 Flouwen 4 Rocheworld Shape 5 James (The Christmas Bush) 6 See also // PlotIn Rocheworld, a small group of civilian and military personnel crew humanity's first manned exploration of another star system. Using a laser-pumped light sail spacecraft, the journey to their destination of Barnard's star lasted 40 years. The crew used a drug called "No-Die" which slowed their aging process, whilst proportionately lowering their effective I.Q., and arrived only a decade physically older than when they left.While exploring the ocean covered lobe of a double planet, named Rocheworld, using one of their space-planes (the Dragonfly), a portion of the crew are caught in a violent storm that causes their plane to experience a crash water-landing. The flooded propulsion systems of the space-plane are unable to provide enough thrust to break free and take off from the ocean surface. The crew decide to use the plane's lift fans as propellers to make their way to the inner pole of the double planet, where the gravitation from the other lobe of the double planet should help them to break free.While making this journey, the space-plane attracts the attention of one of the native species of the planet: the very intelligent, but technologically lacking, Flouwen. The Flouwen and the artificial intelligence aboard the space-plane establish communications and the two species begin to exchange cultural and scientific knowledge.The Flouwen realize the humans are travelling to the pole and warn the humans that they are approaching a period where the configuration of the star and planets of the system allow for a phenomenon where the ocean on the water lobe of Rocheworld can partially flow to the rocky lobe. They try to stop the humans from continuing because this is a violent event. However, the humans have left their SSTO spacecraft on part of the rocky lobe that will be flooded. They convince the Flouwen to release their plane and use the weather phenomenon to their advantage to help break free of the ocean surface. They race the flood to their ground to orbit spacecraft and return to their interstellar ship.Forward's Light-Sail Propulsion SystemThe light-sail system consists of three functional parts: a powerful laser, a large focusing lens, and a giant space-sail. The idea behind the solar sail is that the laser provides a small force on the sail when the sail reflects the light. This small force provides the acceleration of the spaceship. With the ship's primary source of energy coming from the outside, it would not be limited to traveling distances that it had enough fuel for.The light used in the system was an array of a thousand laser generators, which were focused through lenses and aimed at the sail. The lasers provided up to 1500 terawatts of power. Two different lenses were used to magnify the laser beams. The acceleration lens was 100 km in diameter and was able to accelerate the ship at 0.01g; the deceleration lens was 300 km in diameter and was able to decelerate the ship at 0.1g. Although these accelerations are relatively small, over time they result in enormous speeds.To catch the energy, Forward used a 1000-km-diameter, circular aluminum sail. The sail resembled a flattened doughnut with the doughnut hole visible but still intact. That is, the 300-km center sail could be separated from the outer as needed. When traveling to Rocheworld, the entire sail was used. When the ship needed to decelerate, the smaller sail was separated from the larger outer sail. The large sail focused the light onto the smaller sail, which 鎻硃plied the brakes, so to speak.Using the Light-Sail Propulsion system, the spaceship Prometheus continued to accelerate for 20 years, traveling 2 light years' distance toward Barnard's Star before going into coast mode and traveling an additional 20 years' time at a constant speed of .2 c, covering the remaining 4 light years (ca. 23 trillion miles; 38 trillion km). The crew used a drug called "No-Die" which slowed their aging process, and arrived only a decade physically older than when they left.FlouwenFlouwen (the Middle English word for 'flow') are the alien creatures in the book. They are the sole inhabitants of the planet Eau, which makes up the watery half of Rocheworld; Roche is the dry, rocky half....(and so on)


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