G-load trials Spiral decent Airbase De Peel februari 9th 2008
Report • Preparation. • Execution. • Used registration devices. • Sensor calibration. • Retrieved data. • Conclusions. • Recommendations.
Conclusion • At relatively mild spiral descents with descent rate around 13 [m/s] a G-load of more than 3.2 G is reached. • G-load increases with descent rate. • Risk of G-LOC can’t be denied. • It may be assumed that recent fatal incidents during the spiral descent are caused by G-LOC.
G-LOC explained • Means:“G-load induced Loss Of Consciousness” • G-load forces the blood away from the head, no matter how hard the heart may work. • Oxygen and nutrition supply is interrupted. • Eyes and brains cease functioning.
G-tolerance • Average value for normal healthy human beings: 4.5 G • GLOC can occur anywhere between2 and 6.5 G. • A student F16 pilot went out at 2G.
G-LOC symptoms • Grey-out (loss of color in vision) • Tunnel vision (field of vision narrows) • Blackout (no vision any more) • Loss of consciousness • Brain death
Factors which contribute to a decrease in G-tolerance • Any illness, even a minor cold. • Chronic or acute hypotension. (low blood pressure). • Most medicaments. • fatigue. • Non-illegal drugs (alcohol, caffeine). • Dehydration (shortage on drink). • Hypoglycemia (shortage on food). • Stress.
Factors which contribute to a decrease in G-tolerance • The last 5 bullets are typical circumstances during a week of paragliding !!!!!
What to do when you notice one of the symptoms. • Stop spiraling immediately. • Keep your breath and tension all your muscles (this will provide you a couple of extra seconds). • Don’t try straining techniques like a fighter pilot (this requires long and repeated training. Incorrectly performed shall worsen your situation).
Recommendations • Organize training program for instructors and pilots. • Instructors should be trained to make sure they can relay this knowledge to their students. • Pilots have to be informed. • This knowledge should be included to pass the paraglider license examination.