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Dr. Erik Seedhouse, Sunday, 1-27-13 January 28, 2013

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Dr. Erik Seedhouse, Sunday, 1-27-13


Guest:  Dr. Erik Seedhouse.  Topics:  Dr. Seedhouse talked about his new book, “Pulling G: Human Responses to High and Low Gravity.”  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. Erik Seedhouse back to discuss his latest book, “Pulling G: Human Responses to High and Low Gravity.  I strongly recommend this book as it is a terrific resource on the subject of G-force on the human body.  If you buy it using this URL from Amazon, Amazon will make a contribution to The Space Show:  http://www.amazon.com/Pulling-Responses-Gravity-Springer-Popular/dp/1461430291/ref=onegiantlea20.  Our 1 hour 42 minute discussion was in two segments but as our topics overlapped segments, there will be no part one and part two for today’s program summary.  Dr. Seedhouse began the discussion talking about the different types and sources of gravity on the human body.  This included acceleration, lateral, reentry, vibrational, and more. We talked about helmet restraint issues, Formula One race cars and taking corners at high speed producing a high lateral G force, jet fighters, rocket flight, roller coasters, and more.  Erik went over the proposed flight profile in g terms for Virgin Galactic and other proposed vehicles.  He also talked about centrifuge research and findings with the general public at the NASTAR facility.  He then switched to g-load force, fighter pilots and the Anti-G straining maneuver and breathing that they do to help counter excessive g’s.  Suborbital flight came up and here, Dr. Seedhouse had much to say given the small amount of suborbital human spaceflight history.  We also talked about bone loss and density issues, osteoporosis, and obesity.  Erik said the best physical profile for resisting high g force was short and stocky.  The worst was tall and thin.  Don’t miss his explanation for this. He also said smokers do better in high g’s over nonsmokers.  Erik got lots of question about the Bill Weaver SR-71 ejection.  Then he mentioned the Armstrong Line and said above that point, blood boils without a pressure suit. Erik also talked about orthostatic intolerance (OI) in the context of g tolerance.  He talked about professional astronaut training for suborbital missions such as with Astronauts4Hire.  We then discussed the financial problems hitting the Canadian aerospace industry with layoffs, closures, and the possible sale of valuable space hardware.  Listeners wanted to know about anti g countermeasures, if any, and laser eye surgery was discussed although Erik said it was no longer a problem.

      Please post your comments/questions on The Space Show blog. You can email Dr. Seedhouse through me at drspace@thespaceshow.com

Dr. John Jurist, Sunday, 4-29-12 April 30, 2012

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Dr. John Jurist, Sunday, 4-29-12


Guest:  Dr. John Jurist.  Topics:  High altitude sky diving, space vehicle crew escape, free fall from space.  You are invited to comment, ask questions, and discuss the Space Show program/guest(s) on the Space Show blog, https://thespaceshow.wordpress.com. Comments, questions, and any discussion must be relevant and applicable to Space Show programming. Transcripts of Space Show programs are not permitted without prior written consent from The Space Show (even if for personal use) & are a violation of the Space Show copyright. We welcomed Dr. John Jurist back to the program to discuss his latest research dealing with high altitude bail out, space vehicle crew escape, free fall from space, and more.  Dr. Jurist introduced us to the subject by talking about the history of experiments and research in the 50’s and the 60’s for high altitude bail out and the possibility of orbital speed crew escape.  He discussed many technical issues and jump/escape parameters so do listen carefully to our entire discussion.  Issues we addressed included aerodynamic stability, acceleration, deceleration, turbulence, spinning, heat dissipation, and the need to trust one’s equipment.  For example, he cited the famous Capt. Joe Kittinger jump as well as the latest effort to surpass the Kittinger jump by Red Bull and Felix Baumgartner.  Dr. Jurist discussed the differences in suborbital and orbital bailouts and we discussed the generic escape scenarios for upcoming suborbital flights.  John talked about the old Air Force Project Moose program and a listener asked about a free fall from orbital flight, perhaps from the ISS.  Dr. Jurist explained how this might happen and what would be needed for the person to deorbit, free fall, return to the atmosphere, and to survive the experience.  We also talked about the possibility of entering the atmosphere at too steep an angle and skipping off it with the potential of not ever returning.  He said this would not happen.  Don’t miss this fascinating discussion.

In our second segment, Carl asked Dr. Jurist to explain the SR-71 accident that he mentioned in the first segment. This is an amazing story.  You can read about the SR-71 incident described by Dr. Jurist at www.916-starfighter.de/SR-71_Waever.htm.  When asked for lessons learned, John said always trust your equipment and your training.  We talked about cabin pressurization in this segment and John got lots of questions comparing aircraft pressurization systems to those of a space vehicle.  This brought up the use of pressure suits, space suits, and possible shirt sleeve environments for space vehicles.  Later in this segment, John talked about spinoffs, specifically accident improvement with results showing up in the auto industry with safer cars.  Later, he was asked if he thought we were on the right track with HSF crew safety and escape issues and he said we were and that it was an evolutionary process.  Near the end of the program in response to a question, he said the most likely failures would take place in the boost phase of the flight.  Informed consent was mentioned as an issue to be aware of, then he concluded by saying that people are tough and can survive accidents and catastrophic events with the proper equipment and training.

Please post your comments/questions on The Space Show blog.