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Voyager 3 would have been Mariner 13, before the name of the mission was changed. It's actually fairly common when multiple spacecraft are designed to have one with flaws that is used primarily for spare parts. It is also common practice to build a spare spacecraft. In any case, when there were 4 spacecraft there would have been two Jupiter-Saturn-Pluto ...


16

NASA was the most concerned with the thrust oscillation happening near and on depletion of the first stage fuel, roughly 105-115 seconds into the flight after liftoff and just before first stage separation (see Ares I-X Mission Profile below), as it was shown by the computer modeling and early design analyses of the Ares 1 rocket.     This ...


13

Answers to this question are opinions. Assuming that the stackexchange police permit that, here is my opinion. The real objective is lowering cost through reusability. In my opinion, the VentureStar approach made the unnecessary and suicidal leap that reusability required single-stage-to-orbit. It does not. It was single-stage-to-orbit that killed ...


4

Many lessons learned from that activity are being applied to ongoing composite tank work at NASA.


3

Beyond vibration issues, which they were trying to address with a weight to detune the vibration mode, they had an abort issue. The possible blast radius of an SRB was greater than the abort range of Orion, and most likely the parachutes would come back down through the blast and likely melt.


2

After some self research: source SIM was an ambitious mission concept of optical interferometer in space. SIM was in development in period of 1998-2010 (in late years - as downsized SIM-Lite concept). The main science themes SIM was planned to address: How rare are Earth-like planets around closest stars (in habitable zone) How abundand are exoplanets in ...


2

Right up front, the government administrators listed a number of experimental technologies that they wanted incorporated in the VentureStar program. One of these technologies was a composite cryogenic fuel tank. The engineers stated immediately that this wasn't possible — the reason is obvious to anyone examining the facts: the composite material has a ...


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