Later this yr, China will mark the 15th anniversary of its first human spaceflight. On October 15, 2003, Yang Liwei launched into house on a Long March 2F rocket. After making 14 orbits round Earth, Liwei again to the planet as China received congratulations from countries around the globe. It had succeeded the place merely the United States and Russia had formerly.
On the time, the secretive Chinese language executive released few technical tips concerning the spaceflight. However it sounds as if there were some severe issues, highly throughout the launch of the rocket. In a new interview with Xinhua, the legit Chinese language news media, Yang published that he skilled intense vibrations between 30 and 40km above the ground.
“I concept I was going to die,” Yang spoke of. On the time, sitting inside the seat of his cramped Shenzhou spacecraft, he recalled telling himself, “Preserve on! Just continue on for just a little longer.”
The low, thrumming vibrations lasted for 26 seconds beforehand the rocket subsequently calmed down. The remaining of the flight proceeded extra nominally.
Even though the Xinhua article does not state so explicity, this vibration looks to be a manifestation of “pogo,” a metaphor used because the motion of the rocket is something equivalent to the vibrating of a pogo stick. That is brought on when the engines of a rocket thrust at quite exceptional degrees, inflicting changes in acceleration throughout the rocket, and introducing differences inside the stream of propellants.
NASA skilled this trouble most acutely in the course of the launch of Apollo 6, the second uncrewed look at various flight of the Saturn V rocket. For approximately 30 seconds during the launch, the rocket shook violently, unfavourable a number of its top-stage engines. After this flight, NASA took steps to dampen these vibrations and had satisfactory self assurance in these efforts to area human beings on the subsequent launch of the Saturn V rocket, and, indeed, to ship them around the Moon within the historical Apollo eight mission.---