1. AAE 450 – Human Factors Preliminary Design Review Sherri Spreadbury

2. Human Factors Overview zG-Factors zERV Internal Design zMars suit

3. G-Factors z2-4% loss of total body calcium z Bone Growth Stimulator: vibrating platform at frequencies of 20-50Hz. z Sections from sheep femurs showed 20-percent bone growth after a year of 20-minute daily sessions on the platform, as compared to the control group

4. G-Factors zMission G-Loads (1) zShuttle: 3 g’s zApollo: 6 g’s zMercury Atlas: 7.8 g’s zMercury Redstone: 11 g’s

5. G-Factors z Colonel Stapp, 1954: experienced a g-plateau of twenty-five g's and peak force of forty g’s z Primates have experienced forces above one hundred g's with only minor injury, and in one case actually lived through a deceleration of almost 250 g's. (2)

6. G-Factors zPositive Gz Effects. z1. Grayout z2. Blackout z3. Loss of Consciousness (3)

7. G-Factors z Thresholds in Relation to +Gz Tolerance z --------------------------------------------------------------- z Average Standard z Symptom Threshold Deviation Range z --------------------------------------------------------------- z Grayout 4.1 G ± 0.7 G 2.2 to 7.1 G z Blackout 4.7 G ± 0.8 G 2.7 to 7.8 G z Unconsciousness 5.4 G ± 0.9 G 3.0 to 8.4 G z ---------------------------------------------------------------

8. ERV Design z Crew Living Area: 260m 3 z 2-Levels z ht: 2.6m (~8.5ft) z dia: 8m (~26ft) z 2-exit areas z 4-pressurized suits ~100kg (~220lb) (4)

9. Mars suits z4-6 suits zWeight: under 220lb (weigh 85lb on Mars) zPressure zInsulation zPower: rechargeable batteries needed? zManeuverability zRescue mission

10. Future Work zERV Design: better layout, both levels zMars suit: mass, cost efficiency

11. References z(1)History of Manned Spaceflight, David Baker, PhD  (2) History of Research in Space Biology and Biodynamics http://www.hq.nasa.gov/office/pao/History/afspbio/contents.htm z(3) A Hazard In Aerobatics: Effects Of G-forces On Pilots http://avstop.com/AC/AC91-61.html z (4) G-Factors & Weightlessness http://getty.net/texts/spacemed.txt