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posted by n1 on Monday April 10 2017, @10:13PM   Printer-friendly
from the what-goes-up dept.

http://www.satnews.com/story.php?number=1047896505

The US Air Force is open to buying rides on previously flown SpaceX rockets to put military satellites into orbit, a move expected to cut launch costs for the Pentagon, the head of the Air Force Space Command said on Thursday. [...] "I would be comfortable if we were to fly on a reused booster," General John "Jay" Raymond told reporters at the USSpace Symposium in Colorado Springs. "They've proven they can do it. ... It's going to get us to lower cost."

SpaceX has so far won three launch contracts to fly military and national security satellites - business previously awarded exclusively to United Launch Alliance, a partnership of Lockheed Martin and Boeing. All those flights will take place on new Falcon 9 rockets.


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  • (Score: 4, Insightful) by takyon on Tuesday April 11 2017, @01:38AM (3 children)

    by takyon (881) <takyonNO@SPAMsoylentnews.org> on Tuesday April 11 2017, @01:38AM (#492060) Journal

    Send rocket fuel to Earth? No, I think it will be used at refueling stations in space or to launch from lower gravity wells like the Moon.

    Imagine launching a payload to the Moon, attaching it to a set of rockets there, and then relaunching, achieving a greater velocity than could be done from Earth. New Horizons was the fastest launch at an escape velocity of 16.26 kilometers per second. With the lower gravity and lack of drag, you could launch faster from the Moon. So going from Earth to Neptune, Pluto, Planet Nine, whatever would benefit tremendously from the pit stop on the Moon, as long as you have the capability to manufacture rocket fuel using the water there.

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  • (Score: 2) by kaszz on Tuesday April 11 2017, @04:09AM (1 child)

    by kaszz (4211) on Tuesday April 11 2017, @04:09AM (#492122) Journal

    The idea would be to manufacture fuel from scratch in space on the cheap (moon ice + solar panels + accelerator?). And then send it with empty rockets returning back to earth. Kind of cabotage for space.

    • (Score: 0) by Anonymous Coward on Tuesday April 11 2017, @05:29PM

      by Anonymous Coward on Tuesday April 11 2017, @05:29PM (#492372)

      Yeah, but Earth is at the bottom of a hole, and it costs energy to climb down the hole without lithobraking at the end. Because you have to burn more fuel to land with fuel, you only get to sell a fraction of the fuel if you return it to Earth -- and then you're competing on price with locally-produced fuel. You can sell all the fuel (or, if the fuel's generated at the bottom of another hole, e.g. lunar surface, at least more of it) if you establish on-orbit fuel depots -- and now you're competing with fuel lifted to orbit, so you get a much higher price.

      Until you have enough manufacturing capacity to fulfill all current and foreseeable fuel needs in space, it makes no sense to ship any of it to Earth, or to the bottom of any hole where fuel can be produced locally.

  • (Score: 2) by mhajicek on Tuesday April 11 2017, @04:59AM

    by mhajicek (51) on Tuesday April 11 2017, @04:59AM (#492142)

    I also predict launching rockets from the moon through electromagnetic mountain guns, so they escape with considerable velocity before burning any fuel. Hyperloop technology will help with that.

    --
    The spacelike surfaces of time foliations can have a cusp at the surface of discontinuity. - P. Hajicek