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Re: starship-design: LINAC efficiency
> And again, our analysis here was that you couldn't scoop up as much mass as
> the mass of the scoop over any nearby mission.
You would need a large scoop cross-section, but it's not inconceivable.
Let's say your scoop can pick up on average 1 hydrogen atom per cubic
centimeter. Over a distance of 4.3 light years, you can pick up about 7
* 10^-5 kilograms of hydrogen per square meter of scoop area. So to
pick up 10^9 kg of hydrogen during that trip, for example, you'd need a
scoop with an area of 1.5 * 10^13 m^2, or some 2000 km in radius.
This is all just back-of-the-envelope calculation, of course, but it's
clearly an indication that you'd need a very large ramscoop to make a
reasonably-sized ship work.