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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

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Jeffrey (Jefff) Smith, Tuesday, 3-18-14 March 19, 2014

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Jeffrey (Jefff) Smith, Tuesday, 3-18-14

http://archived.thespaceshow.com/shows/2210-BWB-2014-03-18.mp3

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Guest:  Jeffrey (Jeff) Smith.  Topics:  Space Expedition Corp Griffith Observatory event, XCOR, Lynx, NewSpace.  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.

We welcomed Jeff Smith to the program to discuss the recent Space Expedition Corp program held at the Griffith Observatory in Los Angeles.  We initially learned of this event when Doug Messier was recent a guest on the program and since Jeff was going to be in Los Angeles, he decided to attend the event while in Los Angeles.  During the first segment of our 91 minute, Jeff introduced us to Space Expedition Corp (www.spacexc.com) which is a Netherlands based space service company wanting to sell & service flights on the XCOR Lynx suborbital vehicle in Curacao.  Jeff described the audience attending the event, spoke about the qualifications, expertise, and knowledge regarding the Space Expedition Corp’s (SXC) speaker at the event and others in the company.  Listeners asked many questions, including environmental questions regarding rocket pollution in the atmosphere.  Jeff said this was discussed at the event.  Another listener asked about ITAR given XCOR was working with a company in the Netherlands. Both Jeff and then later another listener, Carl, responded and explained the ITAR situation vis a vis XCOR.  Jeff also talked about opportunities in aerospace as a result of many leaving the Air Force or other services after their 20 years.  Another observation Jeff offered was that he thought more companies were interested in marketing space, not doing space.  Jeff was asked if SXC planned Lynx flights at locations other than Curacao.  Listener Carl responded that XCOR was planning flights in the States and elsewhere but it was not clear if SXC would be operating in locations other than Curacao.

In the second segment, I asked Jeff for his thoughts on the NewSpace industry in general, plus the emerging suborbital industry.  Here, Jeff had lots to say, including some concern for market issues and the low barrier to entry for parts of the industry.  Betsy in Tulsa asked him what inspired his interest in NewSpace and like many of us, Jeff was addicted to space everything at a very early age, chose to get an education in a related field and follow a career in aerospace.  He also wanted to follow the entrepreneurial side of things through NewSpace.  He said NewSpace seems to be more ideologically driven than traditional aerospace.  We talked about star gazing in Tucson, the Planetary Science Institute plan for telescopes on a Lynx, & the ability of students, especially at the high school level, to do science experiments that were space related through cubesats and more.

Please post your comments/questions on TSS blog.  Jeff can be contacted through me.

Dr. Dmitriy Tseliakhovich, Sunday, 6-9-13 June 10, 2013

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Dr. Dmitriy Tseliakhovich, Sunday, 6-9-13

http://archived.thespaceshow.com/shows/2025-BWB-2013-06-09.mp3

Guest:  Dr. Dmitriy Tseliakhovich.  Topics:  Escape Dynamics microwave beam propulsion for launches.  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. Dmitriy Tseliakhovich, CEO & CTO of Escape Dynamics (http://escapedynamics.com) to discuss their work on making microwave beamed propulsion possible for space launch.  During our 1 hour 39 minute discussion, Dr. Tseliakhovich talked about his background and passion for space, including helping to open up commercial space.  His work and experience led him to creating Escape Dynamics in 2010 to find a better and more efficient way to space than by using chemical rockets.  Dmitriy then took us through many of the benefits of external launch, including a higher specific impulse, better payload ratios, and even the ability to use an SSTO frame for the vehicle.  During this segment, we also talked about safety issues and using the possibility of using the technology as a space weapon.  During this discussion, Dmitriy was very focused and precise in saying that their systems had to prove out as being safe on all of the issues we were discussing. Next, we learned that the initial beamed propulsion vehicles would be robotic but at some point in the future, eventually crewed launch vehicles would be possible.  We talked about their step by step incremental development and testing plan, including starting with suborbital launches.  I asked our guest about the probable cost of electricity and support from the existing electrical grid.  Our guest had much to say about the cost of electricity, the use of the grid for their power needs & the capability of existing systems to support their needs.  He also did not rule out partnerships with utility companies.  Listeners sent him emails asking about competition and markets as well as the use of hydrogen for fuel.  Our guest was also asked about their heat exchanger, a key component on the vehicle.

In our second segment, Dmitriy was asked about weather issues for launch & we learned that there were concerns and requirements suggesting launching in dry areas would be best.  Another listener asked about ocean launch possibilities & Charles called in expressing skepticism, to support chemical rockets, and to raise questions about the high g force, boost stations, and the size of the ground array needed for the beam propulsion launch system. Roger emailed us to ask about orbital fuel depots & beamed propulsion.  We then talked about the company timeline & learned about 2015 as a suborbital launch target date.  In response to an email about the main challenges, our guest said the challenges to the system were mostly non-technical.  John was our last caller asking about DARPA, project financing, fuels, and more. In closing we talked about available internships and the hiring opportunities at Escape Dynamics.

Please post your comments/questions on The Space Show blog.  You can contact our guest through his website or by using drspace@thespaceshow.com.