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Dr. John Jurist Webinar, Sunday, 4-26-15 April 25, 2015

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                Dr. John Jurist Webinar, Sunday, 4-26-15

Selecting The Rocket Motor, Fuel, & Trade To Optimize The Mission

http://archived.thespaceshow.com/shows/2461-BWB-2015-04-26.mp3- audio

https://vimeo.com/126223310– Webinar video

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Guest:  Dr. John Jurist.  Topics:  Choices and consideration in configuring launch systems.  Please direct all comments and questions regarding Space Show programs/guest(s) to the Space Show blog, https://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.  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.

 

Welcome to this two hour webinar regarding the choices and considerations that can be made in designing and configuring launch systems.  TO VIEW THE WEBINAR VERSION OFTHIS PROGRAM, GO TO https://vimeo.com/126223310.   Note that on the blog for this program are two Power Point presentations for your use.  Dr. Jurist referred to both of them during the webinar, especially the presentation titled “Choices: Some Considerations in Configuring Launch Systems.”  I urge you to follow along with them during the webinar.  During the first segment, Dr. Jurist explained the target market for the webinar and his two presentations.  He then talked about how hard it was to go to Mars and do other missions.  Then he got to the point by saying in designing or configuring the launch system for a mission, you started with the payload requirements which then provide additional constraints once the payload has been defined.  He also talked about the application of the basic rocket equation and explained the importance of exhaust velocity, the Delta-v, and the mass ratio.  Listeners started asking questions so two stage compared to single stage was discussed.  John pointed to the Choices presentation, slide 8.  He talked about propellant and pressures, both in a pressure fed system and with a turbo pump system.  Another listener asked about solids versus liquids, then Marshall called to talk about rocket g forces.  Dr. Jurist talked about designing the rocket envelope environment to the payload specifications.  He then brought in and discussed the vibration envelope.  Helen asked how things would be different with a human payload rather than a satellite or cargo.  Reliability was a big concern.  Near the end of the segment, Dr. Jurist talked about payload mass in Leo and BLEO.  Doug inquired about the gravity loss during the launch, then the segment ended talking about heavy lift, solids and proportional cost factors for SRBs.

 

In the second segment,  Penny asked how the variable that had been discussed would change were one launch from the Moon or Mars.  Adrian emailed in about the NERVA rocket and nuclear propulsion.  Dr. Jurist used the German V2 as an example of launching from the Moon.  Specific impulse and exhaust velocity came up again, then the focus turned to rocket motor cooling systems.  Questions continued coming in asking about 3D printing of rocket motor parts to lower the cost and the use of hybrid rocket fuels with their advantages and disadvantages.  Regulatory issues came up in this segment as did political issues, plus our guest got a question about amateur rocketry.  A listener asked about environmental concerns over rocket fuel . Dr. Jurist directed the audience to the Choice presentation, slide 22, and talked about ways to possibly shed some weight such as dumping the payload shroud.  Near the end, John got questions about the Falcon Heavy, Doug called in with questions about lunar lander economics and more.  In closing, Dr. Jurist said “the fundamental theme of the presentation was the many variables that come into play in designing or configuring a space launch system, how the many variables are inter-related, and how every decision in the process constrains or narrows the remaining options.”

 

Please post your comments/questions on The Space Show blog above.  You can contact Dr. Jurist through me.

                                                       Choices

                                   Launch Vehicle Business Workshop

Dr. Edythe Weeks, Tuesday, 11-20-12 November 21, 2012

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Dr. Edythe Weeks, Tuesday, 11-20-12

http://archived.thespaceshow.com/shows/1897-BWB-2012-11-20.mp3

Guest:  Dr Edythe (Edy) Weeks.  Topics: We discussed her book, various commercial space development models, benefit sharing & more.  Please direct all comments and questions regarding Space Show programs/guest(s) to the Space Show blog, https://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. We welcomed Dr. Edythe (Edy) Weeks to the program to discuss her book, “Outer Space Development, International Relations and Space Law: A Method for Elucidating Seeds.” You can buy her book on Amazon & if you use the following URL, Amazon will contribute to The Space Show/OGLF: www.amazon.com/Outer-Space-Development-International-Relations/dp/1443839655/ref=onegiantlea20.  During our first segment of this 2.5 hour discussion, Dr. Weeks introduced us to her book and the need to understand space development from an international relations perspective.  We talked about how the industry has evolved over the last 20+ years, innovations such as citizen science suborbital missions, new commercial players, & innovative business ideas such as asteroid mining.  Dr. Weeks talked extensively about the need for an ideological shift toward space throughout the non-space population & within our global educational systems.  When Todd from San Diego emailed Edy as to how to create the ideological shift, that opened a discussion on how such shifts are created.  It was very interesting that one of the major examples cited by our guest included the growth & popularity of tattoos.  This sparked quite a conversation, some of it laced with humor, lots of fun, but also relevant points to our discussion.  As our segment was ending, our guest talked about the need to include other perspectives in the space benefits, those coming from outside the STEM fields.
     In our second & very long segment, I opened up asking Edy about the ideas in her book in support of benefit sharing & the Common Heritage of Mankind concepts found in some of the U.N. space treaties.  This discussion prevailed for the balance of our program as our guest is looking for new and different business & social models for space to be more inclusive which she believes will lead to more space commerce.  I took a challenging & argumentative position throughout most of the discussion in explaining why most in the NewSpace and commercial space industries do not support benefit sharing and why. We talked about the need for property rights & why such rights would facilitate commercial development.  Dr. Weeks was not supportive of the property rights positions, looking more for space development to accomplish much needed social change and reform around the world. Also, she made the case that property rights were not needed nor supported by the treaties & their working papers. Dr. Weeks did clarify her position regarding capitalism, the U.S., commercial space companies & benefit sharing ideas so don’t miss her clarification. Let us know your thoughts on our blog. Tax revenues were discussed but as you will hear, our guest focuses on actual benefit sharing beyond tax payments to help create wealth for everyone, including those that would be the recipient of the benefit sharing programs & the commercial space business.  We talked about voluntary charitable giving as compared to mandatory or government required giving through benefit sharing.  I cited Microsoft & Google models for why private sector giving with the pursuit of business unfettered by government induced benefit sharing is better.  Tim called in to express his very strong views in support of the private sector & his opposition to reallocation of resources regardless of how it is termed by either government or the UN.  Edy referenced the OST & the Moon Treaty in making her points, making the case that outer space resources belong to everyone, not just the developer.  While we did use an outrageously successful multi-trillion dollar model for our discussion of the space mining example, the idea was made that the company could easily afford to “give” a percentage to the benefit sharing process, over & above taxes, assuming the company was profitable, even at more realistic levels.  Our guest was very articulate in presenting her views & ideas, plus her book does a very good job of comprehensively dealing with what we just barely had time to scratch during our program.  For more information, check out Edy’s blog and YouTube video:  www.youtube.com/watch?v=okyVWJglxow & http://blogs.webster.edu/globalthinking/blog/2012/07/16/outer-space-development-is-subject-of-new-book-by-hpirs-edythe-weeks/#more-2802.
     Please post all comments/questions about this discussion on The Space Show blog.  I will bring all comments to the attention of Dr. Weeks on a regular basis.
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