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Questions tagged [ula]

United Launch Alliance (ULA) is the combination of the Delta 4 and Atlas V production into a single company.

6
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2answers
361 views

Why is NASA buying expensive rockets from ULA when SpaceX is offering the same thing for almost half the price?

Source: https://www.teslarati.com/spacex-ula-nasa-launch-contract-win-vastly-overpriced-official-protest/ SpaceX has filed an official protest with the US Government Accountability Office (GAO) ...
0
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1answer
107 views

What is the Oxidiser/Fuel Ratio of the Atlas V Centaur Upper Stage?

I can't find this information anywhere for the single or double engine variant. could it be variable? Or is it a secret?
10
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1answer
316 views

Are all payload fairings this floppy?

When I watched the launch of HYLAS-4 and Superbird-B3 on Ariane 5 ECA, for a moment it seemed that ESA is also experimenting with fairing recovery - with a fairing which flaps its wings and flies like ...
5
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0answers
52 views

Black-and-white camera images on GOES-S launch

During todays launch of ULA's GOES-S, the public NASA TV coverage showed the rocket during its ascent, filmed from earth. Sometimes, the image changed to a more coarse grained black and white image, ...
2
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1answer
227 views

How might an internal combustion engine generate substantial external thrust?

This answer mentions the proposed use of an internal combustion engine (ICE) in ULA's ACES upper stage to extract energy from LH2/LOX in multiple forms for multiple uses, which is described further in ...
1
vote
1answer
316 views

ULA's plan for LH2/LOX 2nd stage that can maintain propellant for an extended period of time?

Business Insider's (long) article SpaceX's biggest rival has a 'genius' plan to cut its rocket launch costs more than 70% contains the statements sourced from ULA's CEO Tory Bruno: Vulcan should ...
5
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0answers
261 views

What is the source of the 'whoop' sound made before the liftoff (T-3s) of Atlas-V rocket?

For reference, you can hear the distinct 'whoop' sound at T minus 3 seconds mark of the recent TDRS-M launch. This sound has been distinctive for most previous Atlas-V launches as far as I can ...
4
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1answer
141 views

Human Rate the ICPS on EM-1 of SLS

What specifically must be done to Human Rate the Interim Cryogenic Propulsion Stage (ICPS) to fly humans on Exploration Mission 1 of SLS?
11
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2answers
2k views

Why does the BE-4 use methane as fuel?

I understand the Mars ISRU reasoning for SpaceX's Raptor which is also going to be methalox based. But why would ULA, who is the prime customer for BE-4 besides Blue Origin itself, chose to support a ...
9
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1answer
359 views

Why do the shapes of these two exhaust plumes from an Atlas V 411 look different?

The Atlas V 411 configuration is interesting because there is a single SRB on one side of the first stage, requiring the main engines to vector substantially to keep the thrust mostly axial. The ...
1
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2answers
288 views

ULA: bringing propellants from Earth “Avoids Earth's Deep Gravity Well”?

I read SpaceX’s biggest rival is developing “space trucks” to ferry cargo in an orbital economy in Quartz which linked to this April 2016 outline of ULA's view of Transportation Enabling a Robust ...
-3
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1answer
156 views

Boeing starliner launch vehicle [closed]

Boeing and Spacex is practically in race to human flight launch first. It's rocket-ULA Atlas-V have excellent record already in industry. But the Starliner aerodynamic problems aerodynamic/mass due to ...
2
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0answers
85 views

ULA/Ball Aerospace Intern Sport Rocket

So I've seen ULA post about their intern rocket launch a couple of weekends ago and was curious: What are the performance specs on the motors used for the first/second stage? (Class, quantity, etc.) ...
5
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1answer
104 views

What does the US Govt get out of its Assured Access funding of ULA?

ULA gets a so called subsidy (currently purported to be $800 million a year, since it is being considered to be cancelled) for Assured Access to space. Their lack of a bid on the GPS3 launch contract ...
7
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1answer
614 views

Why are there no more Delta II rockets?

The Delta II is a rocket capable of up to 6 metric tons to LEO, and has the best safety record of any launcher in history. ULA still has the launcher listed as one of its products because it has one ...
2
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1answer
381 views

What was the thrust-to-weight ratio during liftoff of the Atlas V OA-4 launch?

It seemed to me that today's (Dec. 6, 2015) launch of ULA's Atlas V carrying Orbital ATK's Cygnus spacecraft in orbit and towards the International Space Station on the OA-4 mission had a particularly ...
6
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1answer
416 views

How do the secondary payload abilities of different launchers compare?

ULA with their Atlas V seems to be the leading launch service provider for secondary payloads. This FISO presentation is convincing anyway. And good for them since miniaturization of satellites ...
9
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1answer
1k views

What is the object protruding from the left side of the payload fairing during ULA Atlas V 501 AFSPC-5 launch?

OK, What is it? I have not noticed it on previous launches. It's also visible in AFSPC-5 launch videos, for example in this one: And it also comes into view ...
4
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1answer
280 views

What are the actual economics for the ULA reusability plan?

From this article, I gather that ULA is trying to build reusability into their next generation of launch vehicles. Their plan is summed up nicely in the picture: In the article, they seem to do some ...
3
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0answers
168 views

How does ULA propose to get “350% more lift” out of the Vulcan design?

I listened to the annoucement of the Vulcan NGLS booster from ULA. The graphics released and show at SpaceFlightNow.com show a line. "350% more lift" but I could not figure out where that is coming ...
7
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2answers
1k views

What is the point of ULA's IVF? (Integrated Vehicle Fluids)

ULA (United Launch Alliance) mentioned a new upper stage they are working on that will use IVF. Sounds like an internal combustion engine, running a generator, fueled on propellant and oxidizer that ...
11
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1answer
572 views

Are the three core boosters in a Delta 4-Heavy interchangeable?

I was reading an article about the 2 of the 3 cores arriving by barge from Decatur at CCAFS and it noted that the two would be the Starboard and center cores. This made me wonder what differences in ...
7
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3answers
5k views

What are the consequences of Vertical vs Horizontal integration for SpaceX?

One of the issues the Air Force has with using SpaceX as a launch provider is that their payloads are designed for vertical integration. That is, the booster stands on the pad upright, and the ...
8
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2answers
687 views

What ULA innovations was Michael Gass alluding to during latest U.S. Senate address?

I've read an interesting article that mentions Michael Gass, president and CEO of United Launch Alliance (ULA), alluding to ULA innovations during the latest Senate Appropriations Subcommittee hearing ...
17
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1answer
1k views

Why have a 10 minute pause at T-4 minutes?

I was watching the United Launch Alliance (ULA) Atlas 5 rocket launching NASA's MAVEN (Mars Atmosphere and Volatile EvolutioN) to Mars today, and the countdown contained a planned 10 minute pause at T-...