Dan Adamo, Tuesday, 9-14-14 September 10, 2014Posted by The Space Show in Uncategorized.
Tags: " SpaceX, "Range Safety Implications For Brownsville, Brownsville EIR Statement, Brownsville lunar & Martian window, Dan Adamo, debris, dollars to pound to orbit, FAA, Falcon 9. , Falcon Heavy, GEO launches, ground tracks, HSF launches, ISS as a destination, ISS inclination, launch destruct system, launch performance, orbital dynamics primer, possible Georgia spaceport, range safety & nominal ground track., range safety @ McGregor, range safety standards, reusability economics, reusability., Russian range safety issues, Space Enterprise Institute, Texas Gulf Coast launches, Texas launch site, Texas Launches to Earth Orbit
Dan Adamo, Tuesday, 9-14-14
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Guest: Dan Adamo. Topic: Range safety issues at the proposed Brownsville, Texas spaceport plus much more. Please direct all comments and questions regarding Space Show programs/guest(s) to the Space Show blog, http://thespaceshow.wordpress.com. Comments and questions should be relevant to the specific Space Show program. Written Transcripts of Space Show programs are a violation of our copyright and are not permitted without prior written consent, even if for your own use. We do not permit the commercial use of Space Show programs or any part thereof, nor do we permit editing, YouTube clips, or clips placed on other private channels & websites. Space Show programs can be quoted, but the quote must be cited or referenced using the proper citation format. Contact The Space Show for further information. In addition, please remember that your Amazon purchases can help support The Space Show/OGLF. See http://www.onegiantleapfoundation.org/amazon.htm. For those listening to archives using live365.com and rating the programs, please email me as to why you assign a specific rating to the show. This will help me bring better programming to the audience.
We welcomed back to the show Dan Adamo to discuss his paper, “Range Safety Implications for Brownsville, Texas Launches To Earth Orbit.” You can freely download the paper by registering for at http://www.spaceenterpriseinstitute.org. During the first segment of our 2 hour program, Dan started out telling us why he did the calculations and wrote this paper. Next and for the balance of the discussion, we talked about range safety issues, the enforcing organization which is the FAA, the Brownsville EIR, SpaceX launches & how they might work given the range safety constraints that may be applied to this launch site. As you will hear, Brownsville is a completely new launch site with zero history or data behind it so as Dan said, it might have been very easy to overlook or even defer the analysis regarding range safety issues. Also note that Dan said range safety issues are not concerned with the normal or the nominal ground track. The range safety rules consider what may go wrong and who might be impacted by a failed launch, even if it might be rare that such an incident would happen. In response to email questions, Dan said that range safety issues apply to the launch regardless of destination though clearly they can limit the choice of destination as in the case of limitations from Brownsville to the ISS. Dan does a good job of explaining this in the first segment and throughout our discussion. He also addressed listener questions regarding a possible difference in the range safety rules for cargo/satellite launches & human launches. Another issue that came up questioned if FAA range safety rules would be applicable to a private spaceport in the same way for a government launch center like the Cape, KSC, or Vandenberg. Dan said yes and explained the reasoning behind range safety rules. Joe emailed in about range safety for Russian launches, then as the segment ended, our guest addressed launching from other parts of the Texas Gulf Coast which he said presented similar constraints as Brownsville.
In the second segment, Alan asked Dan if he would write a simple primer for orbital dynamics to help the untrained person understand the issues better. Dan will be considering doing that. The question came up if SpaceX rockets would be required to use explosives on board for a destruct command or if the termination of thrust in a problem launch could be handled by other means. Dan got specific questions about the EIR and a possible Falcon Heavy launch as well as Falcon 9 launches. As we neared the end of the show, the subject of reusability came up and then the sparks flew as listeners did not like what Dan said and which I supported. For the most part, the controversy arose because Dan suggested that some customers may not want to pay for the launches of others through reusability and in fact may need more lift from the rocket or more fuel on board their satellite. Reusability requires putting extra mass for hardware and fuel on the rocket, not the customer’s payload. He noted that several Falcon 9 launches had already been made without the reusable hardware. I supported this economically & suggested that as we move toward a fully commercial launch market, customers will buy the launch that meets their needs. Some may be OK with the lower launch costs and less payload capacity while others may need all the fuel they can get on their satellite or all the launch power they can get to put their heavy payload into the right orbit. I made an analogy to the trucking industry where people rent or buy the type and size of truck they need to get the job done & suggested this would emerge for our launch industry in the future. Listeners objected, remained focused only on lower launch costs & not customer requirements. Several listeners sent in strongly worded emails of disagreement with Dan and me for our comments. Both Dan and I said over and over again we supported SpaceX in its reusability work and were glad they were doing this work. We only suggested that the economic of it were still unknown but that would likely change fair soon given the success SpaceX is having with its R&D for reusability. Still, this did not set well with some listeners.
If you have questions/comments please post them on TSS blog above. Even your critical emails but remember our rules for civility. Ideas are fair game, w e do not permit character assassination or name calling. If you want to disagree with Dan, do so with civility. Also, if you do want to disagree, brings facts to the discussion as that is always better than just ideas without supporting information to backup the ideas. You can email Dan Adamo through me. Be sure to download his paper and read it.
Dan Adamo, Dr. Jim Logan, Dr. John Jurist, Tuesday, 11-19-13 November 19, 2013Posted by The Space Show in Uncategorized.
Tags: celestial sphere, chemical rockets, Cislunar transportation, cryogenic fuels, Dan Adamo, Dr. Jim Logan, Dr. John Jurist, Earth departure windows, Earth reentry speed from Mars, Elliptical Earth Parking Orbit (EEPO), Ephemerides, equatorial launch, Grail mission, human spaceflight, inclination, Inspiration Mars, interplanetary payload, kinetic energy., LEO, locus of possible injection points., long way trajectory, Mangalyaan, Maven, nuclear propulsion, Oberth effect, orbit plane change, orbiting fuel depots, prograde orbit, radiation, reusable space infrastructure, short way trajectory, The Space Show Classroom, TMI geometric constraints, trajectory challenges for orbiting infrastructure in support of Earth to Mars departures, trans-Mars Injection (TMI), Van Allen Belts, v_infinity vs. departure date
THE SPACE SHOW CLASSROOM
Dan Adamo, Dr. Jim Logan, Dr. John Jurist, Tuesday, 11-19-13
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Guests: Dan Adamo, Dr. Jim Logan, Dr. John Jurist. Topics: “Trajectory Challenges Faced By Orbiting Infrastructure Supporting Multiple Earth Departures For Mars.” Please direct all comments and questions regarding Space Show programs/guest(s) to the Space Show blog, http://thespaceshow.wordpress.com. Comments and questions should be relevant to the specific Space Show program. Written Transcripts of Space Show programs are a violation of our copyright and are not permitted without prior written consent, even if for your own use. We do not permit the commercial use of Space Show programs or any part thereof, nor do we permit editing, YouTube clips, or clips placed on other private channels & websites. Space Show programs can be quoted, but the quote must be cited or referenced using the proper citation format. Contact The Space Show for further information. In addition, please remember that your Amazon purchases can help support The Space Show/OGLF. See www.onegiantleapfoundation.org/amazon.htm.
Welcome to this special Space Show Classroom program with Dan Adamo, Dr. Logan, Dr. Jurist, and myself. There was no break during this 2 hour 21 minute discussion which at times was very technical. For those of you interested in missions to Mars, orbiting space infrastructure including depots, Earth & LEO departure points, mission and launch trades, payload issues and trades, radiation concerns, and more, you will find this discussion to be extremely informative and educational. Guest Dan Adamo took us through the charts and graphs which you can access on either The Space Show Blog or The Space Show Classroom blog ((see http://thespaceshow.wordpress.com and http://spaceshowclassroom.wordpress.com). Access the document ReuseForMars to follow the MP3 audio transcript. The other document on the blogs is a longer white paper version of the .pdf we used for last night’s discussion. Dan introduced the topic to us, talked about his tangential work in this area at JSC last summer and the space community interest in orbiting infrastructure, especially fuel depots. Dan then took us through the .pdf document discussing and explaining each chart and graph. Rather than report on his page by page discussion, note that Jim, John, and I asked lots of questions per each chart and graph as did listeners by email and later in the discussion by phone. Some of the main points and take aways from this discussion focused on inclination, launch location, penalties and advantages relating to orbiting infrastructure reuse for Earth departures to interplanetary destinations. For example, Russian launch sites are far to the north and will not be as efficient for Mars launches as sites to the south. But as Doug discovered when he asked about equatorial launches, they benefit from a boost due to the inertial rotation of the Earth for higher initial launch speed, but otherwise there is no real benefit from the equatorial launch because minimum Earth orbit inclination is imposed by interplanetary geometry. Another important point had to do with the reuse of orbital infrastructure. As you will hear, it’s virtually worthless to reuse infrastructure in low Earth orbit to support Mars mission departure, including a depot, unless it can be repurposed for something else other than a Mars mission. Don’t miss Dan’s explanation of this. While we talked about Earth departure windows for Mars at two year intervals, we learned that not all these windows are equal. Here, using the tables in Dan’s document, we were able to see just how unequal the Earth departure windows can be. We talked a lot about Elliptical Earth Parking Orbit (EEPO) and the relationships with apogee and perigee for our payload departures for Mars. Later, Dan outlined how we can “store” the cryo in the upperstage of our rocket as kinetic energy in the EEPO shortly after launch, a way to store the cryo energy without having to mitigate boiloff or transfer it between spacecraft. Much was said about radiation and when you go through the trajectories and see them plotted as Dan has done, we learned that not all trajectories are equal as to radiation exposure. Other important elements of our discussion that we focused on included the trans-Mars Injection (TMI) and asymptotic Earth departure velocity (v_infinity). Listener Jimmy emailed us about another paper by a Goddard team that Dan was familiar with and he used some of their data and research. Access their poster at www.lpi.usra.edu/sbag/science/NHATS_Accessible_NEAs_Summary.png (note you may need to cut & paste the URL in your browser). As Dan & our Classroom panel went through charts, graphs, & tables, we applied the information to launches Earth departures in 2020 and 2022. It was valuable to see how the constraints change, not always for the better either. Note that we started with a 400 KM orbit but later dropped it to about 340 km above earth. I suspect you will find the changing constraints and parameters to be more than interesting. Near the end, Doug called in to ask about the reuse of the repurposing orbital infrastructure, including depots, as possible infrastructure for the Moon or a cislunar project. Not only is this a possibility, we learned that something like the orbits that would be involved in doing this were used for the recent NASA GRAIL Mission. During our discussion throughout the program, we talked about the two Mars missions now en route to Mars, Maven and the Indian mission Mangalyaan. Note what was said about Mangalyaan and how it is making use of the type of information we discussed in this program to do a lower energy mission to Mars. In fact, one of the hot topics of our discussion was the comparison between long-way trajectories and short-way trajectories to Mars, what each means for arrival at Mars, capture by Mars, and the return to Earth and capture by Earth. The reentry speed coming back to Earth is crucial as these speeds can be extremely fast with lots of heat to dissipate. Keeping speeds below 12k/s for a human Mars mission is vital.
Please post your comments/questions on our blogs and we will do our best to respond to you. If you want to reach any of our guests, do so through me using firstname.lastname@example.org.
Dan’s charts and graphs are here: MultipleMarsDeparturesR1
To best follow tonight’s discussion, refer to; ReuseForMars
Space Show Webinar with Dan Adamo, Dr. John Jurist, Sunday, 11-25-12 November 24, 2012Posted by The Space Show in Uncategorized.
Tags: antipode, BLEO, boiloff, capture, commercial space, cryogenic fuel transfer, Dan Adamo, Dr. John Jurist, EML1, EML2, Falcon Heavy, Flexible Path, flight trajectory analysis, HALO orbit, heavy lift, human spaceflight, INSITU Resource Utilization, Lagrange points, Lunar farside, lunar flyby, lunar space elevator., lunar water, Mars, Moon, Neo, orbital planning and analysis., Orion, payloads to LEO, Propellant Depots, SLS, Stepping Stones, Trans-lunar insertion
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Space Show Webinar with Dan Adamo, Dr. John Jurist, Sunday, 11-25-12
Video Stream: http://vimeo.com/channels/thespaceshow
Note that you must have the QuickTime player to play this movie if you intend to download it. You can watch it from the above URL without the QT player.