Questions tagged [ula]

United Launch Alliance (ULA) is an American joint venture between Lockheed Martin and Boeing that provides launch vehicle services.

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143 views

Why was an An-124, and not a C-5A Galaxy, used to transport theAtlas V?

First stages of Atlas V rocket used to be transported by air on Antonov-124 cargo aircraft. Later Lockheed-Martin switched to transporting by water. Why C-5 Galaxy wasn't used instead of An-124? ...
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Was there any overlap between United Space Alliance and United Launch Alliance?

United Space Alliance was a joint venture including Boeing and Lockheed-Martin, which provided services and operations for the Space Shuttle program. United Launch Alliance is a joint venture ...
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863 views

Is there a record for unbroken series of "successful launches" by some objective criteria? Who has it now? What has to happen for it to change hands?

From the (I'd say) historic and pivotal hearing Wednesday, March 5, 2014 Defense Subcommittee (Chairman Durbin) Time and Location: 10:00 a.m., in Room SD-192 of the Dirksen Senate Office Building ...
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Technical considerations aside, could I legally purchase three CCBs from ULA and build my own Atlas V Heavy?

We all know and mourn that the Atlas V will never fly in a three-core configuration. What, if anything, prevents me from legally purchasing three CCBs and launching my own Atlas V Heavy, provided I ...
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Why nozzle extensions for ULA's Vulcan; why not make them this long in the first place?

This answer to What is the difference between the Vulcan 562 configuration and the Vulcan 5H2 ("Heavy") configuration? explains that the 2nd stage nozzles were modified by extending them, ...
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What is the difference between the Vulcan 562 configuration and the Vulcan 5H2 ("Heavy") configuration?

I was looking up some information about ULA's Vulcan rocket, and noticed something odd. There are two configurations, Vulcan 5H2 and 562 that have the same number of boosters, the same size of tanks, ...
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Was ULA's mobile clean room on the ground floor or up near the top of the rocket? What were the logistics for getting Perseverance up there?

Spaceflight Now's ULA’s Atlas 5 is NASA’s go-to rocket for nuclear-powered space probes quotes Tory Bruno, president and CEO of United Launch Alliance: Bruno said the mobile clean room set up inside ...
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194 views

ULA's ACES upper stage with IVF - Why are they using internal combustion engines?

I recently read out about ULA's ACES (Advanced Cryogenic Evolved Stage) upper stage with IVF (Integrated Vehicle Fluids), which crazy as it sounds, has two six-cylinder engines developed by Roush that ...
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Out of which alloys are the Common Core Booster and Common Booster Core propellent tanks manufactured?

All sources that I can find indicate that they are isogrid (or possibly orthogrid?) structural tanks manufactured of milled aluminum. However, I cannot find further detail about of which alloy ...
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394 views

Why would rocket bodies use specifically ablative coatings to reduce boil-off of cryogenic propellants? Is ablation important for this?

The end of YouTube video Delta IV Heavy Pad Tour, (with CEO Tory Bruno) - Smarter Every Day 199 points to Destin's second "Smarter" channel's video UP CLOSE Delta IV Heavy Launch Pad Tour (...
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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) ...
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202 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?
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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 ...
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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, ...
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366 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 ...
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745 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 ...
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749 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 ...
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192 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?
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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 ...
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702 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 ...
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361 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 ...
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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 ...
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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.) ...
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113 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 ...
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695 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 ...
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717 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 ...
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539 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 ...
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2k 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 ...
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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 ...
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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 ...
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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 ...
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703 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 ...
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8k 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 ...
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710 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 ...
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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-...