Microlight » Human Factors » G-Forces
G Forces
The human body is designed to cope with the normal force of Earth's gravity, known as 1G.
Additional G-forces are produced when an aircraft changes its speed or direction of movement.
Because blood has mass, increased G-force can affect the circulation of blood around the body.
Positive G
During positive G, such as when pulling out of a dive or making a steep level turn, blood tends to move towards the lower part of the body and away from the head.
As the G-force increases, less blood and oxygen may reach the eyes and brain.
The body generally begins to be noticeably affected at around:
2.5G
Effects of High G on Vision
The eyes are particularly sensitive to reduced blood flow.
As positive G increases, the pilot may experience:
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