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  • Plasma rocket progress....

    VASIMR VX-200 bus

    (note the hex structure - can you say "modular", as in able to use them in arrays?)



    Link...(PDF)

    Ad Astra Rocket Company achieves
    all major 2007 milestones, releases
    ’08 Q1 progress and VX-200 updated
    schedule.


    [Houston, TX. For immediate release] - In
    an internal report to its investors, presented
    in February of this year, Ad Astra Rocket
    Company reported the achievement of all its
    stated milestones in 2007 and presented a
    revised schedule of testing for the VX-200
    VASIMRâ„¢ prototype under development at
    its Houston facility.

    Short for Variable Specific Impulse
    Magnetoplasma Rocket, VASIMRâ„¢ is a
    new high-power plasma-based space
    propulsion technology, initially studied by
    NASA and now being developed privately
    by Ad Astra. A VASIMRâ„¢ engine could
    allow space operations far more efficiently
    and with much less propellant than today’s
    chemical rockets. Ultimately, VASIMRâ„¢
    engines could also greatly speed up robotic
    and human transit times for missions to
    Mars and beyond.

    Ad Astra Houston team at new facility
    Major 2007 milestones achieved included
    key results from a newly operational
    VASIMRâ„¢ 100kW test bed, the VX-100
    and initiation of manufacturing and
    subsystem integration for the first flight-like
    engine prototype, the 200kW VX-200. In
    addition, the company signed important
    agreements with NASA and NAUTEL Ltd
    of Canada.
    >
    Integrated tests for the VX-200 prototype
    are presently ongoing in Houston and will
    continue throughout most of 2008.

    Successful tests have been completed on the
    vacuum integrity of the engine’s first stage,
    as well as the operation of the control and
    propellant feed subsystems. The RF
    subsystem has passed its certification tests at
    its manufacturer, Nautel Ltd. of Halifax, NS.
    Canada, and is being readied for shipment to
    Houston for integration. The high power
    solid-state RF subsystem is a key
    VASIMRâ„¢ component and generates the
    needed radio frequency power to create and
    accelerate the plasma.

    An initial test firing of the full engine
    prototype has been postponed until the 2nd
    quarter of 2008 in order to give Scientific
    Magnetics of Culham, UK. the needed time
    to complete its certification of the
    superconducting subsystem. This is a critical
    component of the engine, which the British
    company is building under contract with Ad
    Astra.

    In the process of design, integration and test
    of the VX-100 and VX-200 systems, Ad
    Astra has generated new patents in the
    efficient production of high speed plasma
    jets and associated thermal management
    technologies. These are necessary in order to
    achieve the overall performance of which
    these engines are capable. These patents
    have now been formally submitted to the US
    Patent Office.

    “The Costa Rica team has matured, spirits
    are high. Nothing can top this adventure”
    said Ing. Ronald Chang D�*az, Ad Astra’s
    Director of Operations in Costa Rica. “The
    Company’s methodical and reliable record
    of meeting its milestones and achieving its
    goals continues to inspire confidence from
    both within and without” said Mr. Robert
    Singer, Ad Astra’s chief counsel and a
    member of its board of directors. “We’ve
    come a long way. At this pace, VASIMRâ„¢
    will reach Technology Readiness Level
    (TRL) 6 this year. The next level will be
    space flight, our ultimate goal” said Franklin
    R. Chang-D�*az, Ad Astra’s Chairman and
    CEO.
    Last edited by Dr Mordrid; 9 March 2008, 03:10.
    Dr. Mordrid
    ----------------------------
    An elephant is a mouse built to government specifications.

    I carry a gun because I can't throw a rock 1,250 fps

  • #2
    Now we only need a braking system that does not work on the principle of reverse trust
    If there's artificial intelligence, there's bound to be some artificial stupidity.

    Jeremy Clarkson "806 brake horsepower..and that on that limp wrist faerie liquid the Americans call petrol, if you run it on the more explosive jungle juice we have in Europe you'd be getting 850 brake horsepower..."

    Comment


    • #3
      Well...you plasma half way there then turn about and plasma-brake the the other half. No getting around physics

      One thing though: there is talk of using this basic design + a reactor & different fuel to make a fusion rocket. Imagine that.
      Dr. Mordrid
      ----------------------------
      An elephant is a mouse built to government specifications.

      I carry a gun because I can't throw a rock 1,250 fps

      Comment


      • #4
        Originally posted by Dr Mordrid View Post
        Well...you plasma half way there then turn about and plasma-brake the the other half. No getting around physics
        There are some ideas concerning inertia and magnetism that possibly could be used as a "space brake"
        If there's artificial intelligence, there's bound to be some artificial stupidity.

        Jeremy Clarkson "806 brake horsepower..and that on that limp wrist faerie liquid the Americans call petrol, if you run it on the more explosive jungle juice we have in Europe you'd be getting 850 brake horsepower..."

        Comment


        • #5
          Originally posted by Dr Mordrid View Post
          VASIMR VX-200 bus

          (note the hex structure - can you say "modular", as in able to use them in arrays?)

          Looks like we are geting closer to this:
          Better to let one think you are a fool, than speak and prove it


          Comment


          • #6
            Like what? No pic, but I have an idea
            Dr. Mordrid
            ----------------------------
            An elephant is a mouse built to government specifications.

            I carry a gun because I can't throw a rock 1,250 fps

            Comment


            • #7
              the pic is of the starship in 2001
              If there's artificial intelligence, there's bound to be some artificial stupidity.

              Jeremy Clarkson "806 brake horsepower..and that on that limp wrist faerie liquid the Americans call petrol, if you run it on the more explosive jungle juice we have in Europe you'd be getting 850 brake horsepower..."

              Comment


              • #8
                Technically, Discovery was not a starship. But the nuclear engines as envisioned for 2001 were somewhat primitive (advanced NERVAs?) compared to VASIMR.

                You could make a reasonable case that Bowman's space pod became a starship in the course of the film.

                Kevin

                Comment


                • #9
                  Dr. Mordrid
                  ----------------------------
                  An elephant is a mouse built to government specifications.

                  I carry a gun because I can't throw a rock 1,250 fps

                  Comment


                  • #10
                    The original design plans for Discovery had the exhaust ports hexagonal, like the housing.

                    I want one of these models so bad!

                    Kevin

                    Comment


                    • #11
                      Not to go too far off-topic, but it occurred to me that the centifuge on Discovery would have had to have been parked and locked and probably anchored while the ship was accelerating and decelerating otherwise it would tear bloody hell out of the motors and bearings in the hub.

                      Doubtful it was mag-lev, given how NOISY it was.

                      IIRC, the centrifuge's axis of rotation was parallel to and centered on the ship's long axis. The rotation of the centifuge would impart an opposite and equal rotation on the rest of the ship that the maneuvering thrusters would have to compensate for (allowing for the greater mass of the ship, of course). Unless they were able to use that counter-spin to advantage, letting the ship spin like a rifle bullet to better maintain course.

                      But my main question: how much thrust would be needed to accelerate the ship from lunar orbit to 100,000 mph as suggested by the novel as Discovery's cruising speed? One might assume no more than 1 or 2 g for the comfort of the crew. But for how long?

                      (My brother is an aerospace engineer but ironically he can't answer such questions because of his security rating!(At least, that's the excuse he uses. ))

                      Kevin

                      Comment


                      • #12
                        emmm maybe Vf = Vi + 1/2 a t^2 where a is the acceleration you want, t is in consistent time units , V is distance /t unit consistent with the units of a

                        Comment


                        • #13
                          I get to approx. 694 Newton assuming a mass of 100,000kg and accelaration for one hour at 1g. You'd have to be out of any gravitational field: 694 newton would not get you to lift off of the earth.

                          There is a reason why I am not an aerospace engineer and my results here may well establish that

                          (694.444 etc Newton to get to 45000m/s which is 162,000Km/hr)
                          Join MURCs Distributed Computing effort for Rosetta@Home and help fight Alzheimers, Cancer, Mad Cow disease and rising oil prices.
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                          • #14
                            VASIMR and other plasma/ion engines trade high thrust for duration, which in the end allows them to run 24/7/365 at lower thrusts. By doing this they can accelerate to very high velocities with a much lower fuel load.

                            ex: Deep Space 1 ran all around the solar system for 678 days. It used less than 74 kg of xenon fuel while generating a thrust of just 92 milli-Newtons of thrust while running on just 2.5kw of solar power.

                            Even with this meager power it gained over 9600 mph of velocity over its launch speed at its peak. It was only shut down when it finally ran out of chemical fuel for its attitude control thrusters.

                            Imagine what megawatt class VASIMR's could do in that time. You'd be up to 100,000 mph in no time with a theoretical top end of just under 300,000 mph.

                            Using a nuclear reactor with an array of 3 VASIMR's the NASA profile mission estimates an Earth->Mars transit time of months (depends on the size of the reactor) vs. 1-2 years with chemical rockets. The ship would take an expanding spiral orbit around Earth gaining speed then slingshot on a very quick trajectory to Mars. Half way there it would turn around and fire the VASIMR's to decelerate to a velocity appropriate for insertion into Mars orbit. The return trip would be the reverse procedure.

                            NASA concept video showing the long duration flight: http://www.youtube.com/watch?v=Zj53rVWK5z0

                            The fastest Earth->Mars transit they have numbers for is just 39 days using 3 VASIMR's, a 600 mt ship and reactors totaling 200 mw. Yes, they do have space reactor designs that could pull this off.
                            Last edited by Dr Mordrid; 12 March 2008, 11:42.
                            Dr. Mordrid
                            ----------------------------
                            An elephant is a mouse built to government specifications.

                            I carry a gun because I can't throw a rock 1,250 fps

                            Comment

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