Développement du Space Launch System (1/2)

Lucas31 a écrit:Test reporté suite à un problème sur un ordinateur du booster. (simplement délayé ou complètement reporté...)

Sidjay a écrit:Étonnantes toutes ces petites fumées bien visibles à la surface du sol et en parallèle de l'axe principale de tir, à environ 30mn plus haut.... C'est dû à quoi à votre avis ? La simple propagation de la chaleur dans le sol ?

Aramis a écrit:Et toujours cette fâcheuse manie chez la NASA de tester seulement à l'horizontale les boosters "à poudre".

Aramis a écrit:
Et toujours cette fâcheuse manie chez la NASA de tester seulement à l'horizontale les boosters "à poudre".

peronik a écrit:

Aramis a écrit:
Et toujours cette fâcheuse manie chez la NASA de tester seulement à l'horizontale les boosters "à poudre".

 
ils n'ont pas toujours tester a l'horizontal

dans un programme parallèle a Apollo ils ont cherché a créer un super booster a poudre qui aurait pu remplacer le 1er étage d'une Saturn I, ils ont tester 3 booster

Motors 260 SL-1 , SL-2 et SL-3 :  diamètre 6.63 m X 24.59 m  842,900T poussé max 16 MN 

(cf : https://en.wikipedia.org/wiki/Solid-fuel_rocket   section history)

les booster étaient  installés à la vertical  tête en bas (bonjour la chandelle lors des tests)
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20000033816.pdf
le rapport de la nasa

cosmiste a écrit:

Argyre a écrit:
C'est à cause d'eux que la Terre a ralenti sur son orbite et qu'on a dû ajouter une seconde intercalaire :
https://fr.wikipedia.org/wiki/Seconde_intercalaire ;-)

Mr. Sarafin also noted that the Core Stage engines will probably throttle back in the last several seconds of their burn to limit vehicle acceleration, but the timing will also depend on more precise determinations of the thrust-to-weight* of the vehicle.

A primary objective of the test series with E0528 is to verify the new engine control system and new engine controller for the RS-25.

https://www.nasaspaceflight.com/2016/07/engine-0528-rs-25-testing-sls/ a écrit:Another difference for the engines between Shuttle and SLS is that the engines will be closer to the plume from the SLS solid rocket boosters; an ablative insulation is being tested on the RS-25 engine nozzles to protect them from increased heat due to the closer location to the booster nozzles.
The insulation may also protect the engines from other hazards due to the closer location to the aft separation motors on the boosters and to the hydrogen exhaust ports for the Core Stage auxiliary power units.

“Early on in the SLS program we thought we were going to need a lot more ablative than we actually need now,” Mr. Wofford said. “The question right now is whether we need it at all. The analysis is kind of borderline as to whether we need or not, but due to those uncertainties…we are going to incorporate it. It’s possible that we may not need it, but we’re doing it for safety’s sake.”

NSF a écrit:Interestingly, evaluations continue to show “over performance” against the baseline 70 mT and 105 mT ratings, which have been further aided by the future incorporation of the powerful Exploration Upper Stage (EUS).
It has been claimed internally, that the Block 1B, with advanced boosters and EUS, could achieve most – if not all – of NASA’s deep space exploration goals, potentially removing the need to evolve to the Block 2. NASA, however, continues to cite Block 2 for its main Mars missions.
Notably, the Block 2 isn’t expected to debut until the end of the 2020s at the earliest, by which time SpaceX’s even more powerful Exploration Class rocket for its Mars Colonial Transporter (MCT) system should already be flying.