Développement du Space Launch System (2/2)

josé a écrit:près de 900 tonnes d' H2,  cela fait des litres  !!!!

ICPS -- The qualification test article, without the engine, is around 29 feet tall and 16.8 feet in diameter. It will be filled with liquid nitrogen for testing, rather than liquid oxygen and liquid hydrogen. "Liquid nitrogen is the safest cryogenic media to use for testing," VanCleave said. The ICPS was designed and built by Boeing and United Launch Alliance.
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It will be the first integrated piece of SLS hardware to arrive at the Cape and undergo final processing and testing before being moved to Ground Systems Development Operations at NASA's Kennedy Space Center.

The aft dome of the LOX qualification tank, which will be used for structural testing, was loaded into a tool called an “in feeder” that positions domes and barrels underneath the existing structure as they are welded together in the VAC.  Final preparations for welding the dome to the rest of the LOX tank were being completed when the mishap occurred on May 3.

“We were processing the qualification oxygen tank and we were ready to move [the dome] into position,” NASA Associate Administrator for Human Exploration and Operations Bill Gerstenmaier noted in a media teleconference on May 12 regarding the Exploration Mission-1 (EM-1) crew study.

“As we were getting ready to move it in underneath the tank, to remove some protective covers on that dome a technician lowered the dome down and when they did that it essentially ran the dome into eight fixtures that hold the dome in the device [and] caused significant damage to the dome.  It’s probably not repairable.”

“This was a significant event for us, we call it a Class B mishap,” Gerstenmaier continued.  “Boeing has formed a team to go look at it, NASA has formed a team to go look at the event, we’ll learn from this event and we’ll move forward.”  Although there were no reported injuries, property damage values in Type B mishaps are categorized as losses of “at least $500,000, but less than $2,000,000.”

https://www.nasaspaceflight.com/2017/06/asap-nasas-dsg-stepping-stone-mars/ a écrit:au plus tôt Août 2019 pour EM-1 et Juin 2022 pour EM-2 - L'écart entre les 2 missions est inévitable, avec le lancement d'EM-1 sur un SLS block 1, avant des changements majeurs - notamment sur le mobile launcher (ML) - qui devront être effectués pour le SLS Block 1B d'EM-2.

Thierz a écrit:L'avantage est-il optique pour avoir un moyen de contrôle visuel de l'attitude ?

Les damiers en noir et blanc servent de «cibles» pour les caméras situées dans des endroits stratégiques sur le véhicule et sont utilisés pour la photogrammétrie, science de l'utilisation de la photographie pour mesurer la distance entre les objets.

Wakka a écrit:Les "Swooshes" officiellement abandonnées pour laissé place à un damier sur les SRB du SLS.

Les damiers en noir et blanc servent de «cibles» pour les caméras situées dans des endroits stratégiques sur le véhicule et sont utilisés pour la photogrammétrie, science de l'utilisation de la photographie pour mesurer la distance entre les objets.