The outside-inside vertical 8 is probably the most physiologically demanding; the pilot experiences a maximum of -5.2G's in the upper outside loop and 5 seconds later pulls +5.0 G's in the lower inside loop. This amounts to 10.2 G's in 5 seconds, or over 2G's per second for 5 seconds. Even G-tolerant pilots may have changes in vision or possibly loss of consciousness in this maneuver.
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"If we could read the secret histories of our enemies, we would find in each story enough sorrow and suffering to disarm all hostility." Longfellow
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