![]() ![]() It does not like jolts, surpluses or shortages! The brain is particularly demanding in this area, both in terms of consumption (it is greedy) and the regularity of its supply. They are inherent to the inertial forces generated by acceleration and apply to all the organs of the body, and in particular to the cardiovascular system: the heart (the pump), the vessels (the circuit), the blood (the fluid).īlood circulation ensures the transport of oxygen, which is essential for the proper functioning of organs. The aircraft pilot is in fact subject to a wide variety of physiological effects during flight due to the combination of acceleration and gravity. How our body manages gravity in normal times To calculate the Gs to which they are subjected, airplane pilots, who are particularly exposed, are equipped with three-axis accelerometers: they can thus know in real time what they are undergoing. On the other hand, if the aircraft is flying on its back, for example, the load factor is expressed as a negative -G. When the apparent weight in motion is greater than the actual weight, the load factor is greater than +1G. Whether turning for a car or vertical for an airplane, a resistance opposed to the movement, the force of inertia, is added to the real weight due to gravity to give the "apparent" weight of the aircraft in flight. To further complicate the situation, for all three axes, positive but also negative G's are possible. from head to toe, since this is where we feel the force of the earth's gravity necessary to maintain its balance. We are particularly sensitive to these accelerations in the vertical axis (Gz), i.e. Finally, Gz occurs during a descent of the aircraft or following a sudden climb. For a horizontal acceleration or deceleration, we speak of Gx. We can experience lateral G's (Gy) during a turn resulting from the centrifugal acceleration that pushes us outward. In fact, there are three main types of Gs present in three axes of space. From 8-9 G, it is impossible to move his limbs, except for the extremities. A person weighing 80 kg on Earth (considering that it is a situation equal to 1G) will have the sensation of weighing 160 kg if he/she undergoes 2G. At 2G, for example by taking a 60 degree inclined turn, we already have a moderate compression sensation on our seat, a difficulty to move. When standing still on the ground, the acceleration felt is 1G. ![]() Some aircraft are capable of reaching 12G, with acceleration rates of over 15 G/s! How many G's do we go through on a daily basis? ![]() Any aeronautical maneuver can therefore expose our body to significant accelerations, with notable repercussions on the cardiovascular, cerebral and articular levels. We only have to see the last aerial circumnavigations of Pete "Maverick" Mitchell in the last Top Gun to be convinced.įlying consists in overcoming gravity to rise into the air, and speed is essential. When we get on an airplane, without crashing this time, everything we have learned about gravity and what we are used to changes abruptly. And its effects can be formidable.Īs children learning to walk, we quickly discover that a misstep will eventually result in a painful impact with the ground due to gravity. In aeronautics or in the automobile industry, specialists refer to the G (for gravitational), or load factor, as the unit of acceleration. Copyright Paramount Pictures - Top Gun: Maverick, CC BY-SA Stéphane Perrey, University of Montpellier Acceleration and aerobatics put the pilots' bodies to the test. However, there are circumstances where our body is subjected to more than the classical terrestrial gravity. Our species is acclimated to a world of constant gravity - in this case, a pervasive force of acceleration born of the Earth's attraction (the unit of gravity, g, is 9.81 m/s2). ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |