Human Tolerance and Safe Limits
Positive G Head to Foot is denoted by +gz
Negative G Foot to Head is denoted -gz
Linear G Chest to Back is denoted +gx
Linear G Back to Chest is denoted -gx
Lateral G Right to Left is denoted +gy
Lateral G Left to Right is denoted -gy
The tolerance levels are taken from Paul M. D's "Bioastronautics Data Book," NASA SP-3006, 1964 "G Tolerance in 4 vectors".
Positive G-Force Tolerance
The human body can usually tolerate about +9gz with the aid of a protective suit. Positive G-Force becomes uncomfortable for the human body at +5gz.
At 1gz, humans exhibit no ill-effects except for gradual ageing as this is the natural level on earth.
At 2gz, facial tissue sags and hands feel heavy
At 3gz, movement is difficult
At 4gz, visual symptons and slowed awareness
At 5gz humans are at risk of loss of conciousness
When under high positive G, blood is being forced from your head to your feet so you 'Grey Out'
Negative G-Force Tolerance
The human body exhibits alarming symptons at just -2gz and on a roller coaster a level higher than -1gz would be considered dangerous.
At -1gz, humans exhibit a sense of pressure in their head
At -2gz, there will be a severe headache, nose bleeds and swelling of the eyelids
At -3gz, Eyes will bleed, vision will fade, eyes will feel as though they are popping out their head
At -4gz, mental confusion and unconiousness
At -5gz humans are at risk of losing their eyeballs and death.
When under high Negative G, blood is rushing to your head and can cause very serious 'Red Out' and cause your brain to bleed.
Linear G-Force Tolerance
Human's can tolerate up to 17 Linear G Front to Back and
-7 Linear G Back to Front.
Lateral G-Force Tolerance
Humans can tolerate high levels of lateral G if properly restrained, otherwise injury to the body can occur.
The text above was copied from the CoasterForce web site:
http://www.coasterforce.com/coasters/te ... -a-coaster
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