<Li> Blackout, a loss of vision while consciousness is maintained, caused by a lack of blood to the head . </Li> <Li> G - LOC, a g - force induced loss of consciousness . </Li> <Li> Death, if g - forces are not quickly reduced, death can occur . </Li> <P> Resistance to "negative" or "downward" g, which drives blood to the head, is much lower . This limit is typically in the − 2 to − 3 g (− 20 to − 29 m / s) range . This condition is sometimes referred to as red out where vision is figuratively reddened due to the blood laden lower eyelid being pulled into the field of vision Negative g is generally unpleasant and can cause damage . Blood vessels in the eyes or brain may swell or burst under the increased blood pressure, resulting in degraded sight or even blindness . </P>

What level has resistance between the axis and the force