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Questions tagged [reliability]

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2
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1answer
139 views

Which Cubesat Cameras Actually Worked in Orbit before 2019?

Short question: Which Cubesat Cameras Actually Worked in Orbit before the year 2019? Context and explanation: The very few missions which published at least one image I've found: Planet Labs ...
2
votes
1answer
96 views

What is a “delta-qualification” program?

In the NASA Independent Review of the Antares Orb-3 failure, they refer to a "delta-qualification program": As a result, this area of the turbopump is vulnerable to oxygen fire and failures. The ...
8
votes
2answers
585 views

How reliable are pressure fed hypergolic engines?

A fair amount of "what-if" discussion surrounds rocket engine failure at critical points in various manned missions -- lunar ascent and trans-Earth injection on lunar landing missions, retrorocket ...
3
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0answers
231 views

Could multimode (polymer) optical fiber Gigabit Ethernet be a better choice than WiFi inside future satellites?

In this answer the recent question Are and should satellites use wireless communication internally, rather than cables? it is stated that: This is actually an open research area and despite ...
3
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5answers
438 views

Are and should satellites use wireless communication internally, rather than cables?

Some applications on Earth replace wires with radio communication, standard stuff like Bluetooth. It saves mass and maybe complexity. Is this done for intra-satellite communication and deep space ...
24
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4answers
6k views

Is the Pi really fit for outer space?

Recently, there has been growing interest in using Raspberry Pis in CubeSats. NASA is even in on the trend. But, considering that outer space is pretty harsh on electronics (i.e. radiation and cosmic ...
7
votes
1answer
2k views

What exactly does it mean to human-rate a rocket? As opposed to the escape system?

The escape system is that thin pointy part at the very top of the rocket. It has powerful solid rockets that basically act as an "ejection seat" for the entire crew capsule. So when we talk about "...
5
votes
1answer
941 views

Most common causes of 21st century launch failures and how often do launches fail?

In this document (Page 7, point 4.3), Garrett Reisman notes that an analysis by Aerospace Corporation showed the most common causes for launch failures between 1980 and 1999. This document shows the ...
28
votes
1answer
791 views

How do we know that Voyager's data is correct?

I was wondering for some time how we know that the scientific data received by the Voyager spacecrafts are correct? Specifically, I'm wondering about the recent "tsunami-wave" (frequency of ionized ...
17
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3answers
5k views

Why are the very reliable rockets Atlas V and Ariane V not rated for human flight?

During the last ten years all 100 or so launches by Atlas V and Ariane V together have been successful. (One Atlas V payload entered too low orbit, but that would hardly have risked the life of a crew)...
10
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2answers
695 views

What caused the Lunar Landing Training Vehicle to be unreliable?

The Lunar Landing Training Vehicle was used during the Apollo missions to simulate flying the lunar lander at 1/6th the force of Earth's gravity: Many sources have indicated a conflict between ...
7
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2answers
150 views

Flight testing before manned flights: what are various countries' requirements?

How many technology demonstration/certification unmanned flights does it take to man-rate a spacecraft in the US, Russia, and China? What Loss-of-Crew probabilities are considered acceptable in those ...