Historical launch accelerations follow specific g-force thresholds for human safety
the verdict
INSUFFICIENT LEANING
refutedsupported
the weight of evidence
3 sources for · 0 against
The evidence touches on historical launch acceleration values and human tolerance limits in spaceflight programs, but does not comprehensively establish specific g-force thresholds as definitive safety standards across all historical launches.
Extremes of low-frequency vibration cannot be long endured, while sustained zero gravity in space flight produces mild, transient malaise followed by adaptation in several hours. Aerospace flight biodynamics deals with human reactions to absence of gravity; sustained curvilinear acceleration; sustained acceleration and deceleration (launch and reentry in space flight); single impact force (collisions); low-frequency vibration in the whole human body resonance response range; whole-body tumbling and spinning, as in high-altitude free-fall; acoustical range vibrations; explosive blast in air or water; abrupt decompression, as in cabin pressure failure; static forces in tension, compression, torsion and shear. Biodynamic stress analysis takes into account whole-body responses, particular responses of rigid bone, viscous elastic soft tissues, pneumatic and hydraulic effects of gas and fluids in hollow organs, and displacements of solid organs suspended in body cavities.
NASA/TM-20205008196
## Artemis Sustained Translational Acceleration Limits: Human Tolerance Evidence from Apollo to International Space Station
James M. Pattarini, NASA Jeffrey T. Somers, KBR Jacquelyn Charvat, KBR Devan Petersen, KBR Nathaniel Newby, KBR Preston C. Greenhalgh, KBR Michael B. Stenger, NASA Stuart M. C. Lee, KBR
National Aeronautics and Space
Administration
Johnson Space Center Houston,
Texas 77058
#### November 2020
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# Launch Accelerations: Values, history
Tags: launch, rockets, apollo-program, crewed-spaceflight, uncrewed-spaceflight
- Score: 25
- Views: 39978
- Answers: 2
- Answered: yes
- Asked by: Kengineer (1788 rep)
- Asked: 2015-01-15
- Edited: 2015-01-16
- Site: space
## Question
This topic: What G-forces do different launchers cause? indicates that current satellite launchers are limiting peak acceleration to about 4g. I'm pretty sure the STS (Shuttle) did the same. My recollection from the Apollo days is that they threw 6g and 8g figures around for peak launch accelerations, or possibly peak re-entry forces.
What are typical peak accelerations of manned launchers? Soyuz, planned SLS (Orion), planned Dragon? What about re-entry?
What were values in the 60's? What was the astronaut experience then? How critical was it that we reduce the forces?
## Answers
### Answer by Russell Borogove (score: 30)
Ascent G-Forces
The Apollo 11 AS-506 launcher flight report contains a nice graph of the G-force curve of that famous Saturn V launch:
From this chart you can see that, off the pad, the Saturn V first stage is doing about 1.2g; this climbs rapidly as atmospheric drag falls and fuel m
Everything we examined (3)
This check searched the claim as stated. It did not run a separate search for evidence against it.