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By the time a civilization is ready to use this technology, the carbon nanotube's manufacturing might be optimised enough for them to have a density lower than the 0.7g/m² mark, and the average sail density with rigging might be kept to 0.3 g/m² (a "spin stabilized" light sail requires minimal additional mass in rigging).
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We chose a graphene-based sandwich material for the light sail because of its low density.
The lightest carbon-fiber light sail material currently produced has a density – without payload – of 3 g/m², or about four times as heavy as would be needed to construct a solar statite.
Moreover, uncertainties in the density of interstellar matter and sail properties need to be explored.
If such a sail could be constructed at this areal density, a space habitat the size of the L5 Society's proposed O'Neill cylinder – 500 km², with room for over 1 million inhabitants, massing 3 tons – could be supported by a circular light sail 3,000 km in diameter, with a combined sail/habitat mass of 5.4 kg.
A statite deployed around the Sun would have to have an overall density of 0.78 grams per square meter of sail.
Contour maps were constructed by kernel density estimation as implemented in 'R' (v.3.0.2, 2013-09-25, "forsby Sailing" for Mac-OS X 10.6 Snow Leopard) using the spatstat package (Baddeley and Turner 2005) and included weighting for sample size.
(5) Since the annual estimation of outlet density exposure automatically includes people who move residence, (from using the WDS within SAIL), our main models will correct for population migration.
Its high density allows it to counterbalance the heeling effect of wind on the sails while at the same time occupying a small volume and thus offering the least underwater resistance.
The 5 Gyres team sails a highly efficient 72 foot cutter, and has decreased the cost of at sea plastic density data collection to around $2,000 a day.
More density, more personal density.
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