Living reference work entry
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“Gravity is a habit that is hard to shake off.” – Terry Pratchett
Short-term weightlessness created by allowing an airplane to perform a “free fall” during a parabolic trajectory.
Weightlessness can be defined as absence of any external mechanical contact forces. Accordingly, an object in a free-fall condition is weightless when exclusively affected by gravity. Therefore, short-term real weightlessness is created within Earth’s atmosphere by flying an airplane along a parabolic trajectory correcting for air resistance. The parabolic flight platform has been used to study immediate effects of weightlessness on human physiology, physical, or combustion science, as well as astronaut training since the late 1950s (Haber and Haber 2009). Depending on the aircraft and flight pattern, anywhere from 10 to 45 s of weightlessness is generated, which is preceded and followed by an acceleration and a...
KeywordsParabolic flight Weightlessness Microgravity Zero-G Flight pattern Physiology
- Bailliart O, Capderou A, Cholley BP, Kays C, Riviere D, Techoueyres P, Lachaud JL, Vaida P (1998) ‘Changes in lower limb volume in humans during parabolic flight’, J Appl Physiol (1985), 85:2100–5Google Scholar
- Lindley EJ, Brown BH, Barber DC, Grundy D, Knowles R, McArdle FJ, Wilson AJ (1992) ‘Monitoring body fluid distribution in microgravity using impedance tomography (APT (applied potential tomography))’, Clin Phys Physiol Meas, 13 Suppl A: 181–4Google Scholar