Questions tagged [launch-vehicle]

Questions about a craft used to propel payloads into space, usually a rocket-powered vehicle

Filter by
Sorted by
Tagged with
4
votes
0answers
56 views

Low-pressure pump-fed rocket engine?

I saw the above suggested in LEO on the Cheap. In P.130 it says: A compromise between high-performance/lightweight pump-fed vehicle designs and cost-optimized pressure-fed vehicles with heavier ...
7
votes
2answers
986 views

In what ways is helium used on modern launch vehicles?

Helium is a fairly rare material and does not remain in the atmosphere. I'd like to know the uses of helium on modern launch systems? Do most launch vehicles use helium in several different ways, or ...
0
votes
1answer
165 views

Did the Perseverance rover's Atlas 5 really “leap off the pad”? If so, was it because the payload is tiny, or because it's going to Mars?

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: “This rocket is going to leap off the pad with ...
1
vote
1answer
98 views

Would an airship-launched rocket be practical?

This is essentially a mix of the rockoon (https://en.wikipedia.org/wiki/Rockoon) and air launch to orbit (https://en.wikipedia.org/wiki/Air_launch_to_orbit) concepts. A rockoon is a rocket that's ...
5
votes
1answer
144 views

What kind of rocket will ESA(?) launch from Mars? Who will build it?

The NASA-credited images below are from the BBC News article Europe pushes ahead with 'dune buggy' Mars rover which explains that it will drive around quickly on it's big 70 cm wheels (see article for ...
2
votes
0answers
88 views

What parts of a rocket are particularly cheap or inexpensive?

Related: What is the most expensive part of a rocket? What parts of a launch vehicle, if any, are particularly inexpensive? This can mean "similar in cost to common commercial-grade analogues", "...
6
votes
5answers
378 views

Has any rocket been launched into orbit from a plain flat surface?

Related: Why will Superheavy/Starship have a landing pad so close to the launch pad? Most launch vehicles are launched from somewhat complex launchpads with towers, erectors, flame trenches or ...
6
votes
1answer
181 views

How could the landing date of Perseverance Rover be fixed irrespective of 26 days launch window?

I am very much aware of this question from 2018 by @uhoh - Why would InSight's arrival date at Mars be fixed, and independent of the launch date?. I was led here by a similar question which arose in ...
2
votes
1answer
152 views

Is SLS capable of launching the core stage into LEO?

After watching the Hazegrayart video If Rockets were Transparent I realized that I didn't really have a clear idea what the Space Launch System (SLS) is capable of doing. Question: Is SLS capable of ...
6
votes
1answer
140 views

Who started conducting multiple-payload launches routinely, and on which vechicle?

I know multiple-payload launches are routine these days, and everyone seems to have their own reignitable kick-stage. But who were the first to start doing that? This is similar to this question, but ...
1
vote
0answers
52 views

Could any modern launch vehicle have put Ulysses in it's polar heliocentric without going to another planet first?

This answer to Why aren't satellites launched into a Polar LEO to get into Polar Heliocentric Orbit? leaves me wondering if it could be done today without the trip to Jupiter. Could a replica of the ...
4
votes
1answer
87 views

What criteria influence launcher aspect ratio?

One factor when designing a launcher is the total $\Delta V$ required. For a given $\Delta V$, engineers can define the propellant quantity. From this quantity they can define the volume of the ...
1
vote
0answers
73 views

Missing Launch Vehicle

Early Soviet era launch vehicles had a variety of designations, e.g. the well known Vostok launcher and its derivations have been known as the R7, 8K72, Semyorka, SS-6, Sapwood, A-1 and SL-3 . I'm ...
1
vote
0answers
70 views

Would the 6.5 ton capable Blue Moon lander fit in New Glenn?

As the 2 massive projects of the same company, are they designed to be compatible for NASA's CLPS program ? New Glenn's said to have a 7 m payload fairing diameter but as far as I know, Blue Moon's ...
4
votes
3answers
4k views

Why doesn't the USA use structurally stronger rockets for the more important launches?

Russia uses the R-7 ICBM-derived Soyuz launch vehicle for most of its space launches. The advantage of it is that there's no concern on what the weather is like on launch day and Soyuz launches almost ...
4
votes
2answers
288 views

How do spherical SRB's compare to long skinny ones? What do their thrust curves look like?

Most SRBs are long and skinny, probably because most are used low in Earth's atmosphere where aerodynamic drag is large. But here are some very short SRBs, one seemingly spherical except for the ...
2
votes
2answers
159 views

How many stages were used to put Iran's satellite NOUR 01 (45529) into its orbit?

Fox News' Iran-launched military satellite entered Earth's orbit, US Space Command announces says: “Iran’s first military satellite, Noor, was launched this morning from central Iran in two stages. ...
11
votes
2answers
294 views

Why are balloon tanks used by so few rocket designs?

Balloon tanks, first used on the MX-774 sounding rocket (the direct, though distant, ancestor of the Atlas family of missiles and launchers), are structurally stabilised by internal gas pressure, ...
3
votes
1answer
239 views

Does NASA really report the power of rockets in horsepower?

On a recent episode of The Late Show with Stephen Colbert, Dr. Neil deGrasse Tyson said: And to this day NASA will still report the power of rockets in horsepower, which is completely absurd, ...
2
votes
1answer
93 views

Shape of satellite launch vehicle

I was watching videos on YouTube, and I came across a fact that satellite launch vehicle has shape like a nose or you can ogive shape and I search on Google related to that, and I found that it ...
1
vote
0answers
69 views

Have studies / worked examples, including mass figures, been published for these reentry methods for reusable upper stages?

(Related: is there a general rule of thumb for thermal protection systems?) For a fully-reusable launch vehicle to be developed, we need a lightweight thermal protection system and method for (...
3
votes
1answer
1k views

Rockoon on steroids

In typical rockoon a balloon is the lifting body to the upper atmosphere where a rocket is released and ignited. But I would like to ask about a variation to launch small payloads to space. Instead ...
7
votes
2answers
440 views

Does Arianespace have a modified Soyuz launch vehicle?

Ars Technica's OneWeb joins the satellite Internet gold rush this week says: The company chose to partner with Arianespace and its modified Soyuz launch vehicle for the 2020 launches because, ...
4
votes
2answers
1k views

Launch system to get a 75,000 kg object to geostationary orbit?

Is there any current launch system that could get a 75,000 kg object to geostationary orbit? If not, am I correct in assuming the Saturn V could have gotten such an object there?
8
votes
0answers
131 views

Were there any launch vehicles with so heavily pronounced Plume Induced Flow Separation (PIFS), other than Saturn V?

This answer describes a very interesting phenomenon of Plume Induced Flow Separation on Saturn V vehicle. (Apollo-6 S68-29737 photo, courtesy NASA) This is, basically, when "fire" from ...
6
votes
0answers
210 views

Why is the diameter of the boosters of some launch vehicles smaller than the diameter of their payload fairing?

Whilst watching yesterday's Starliner launch I've noticed how skinny that Centaur (3.1m) looks compared to the CST-100 (4.5m). Looking up the Atlas V I was amazed to find out that it has even larger (...
3
votes
1answer
150 views

NASA's definition of a launch vehicle

Does NASA's use of the term launch vehicle apply only to those that ascend from the Earth's surface and leave the atmosphere? If so why is the term limited that way?
10
votes
1answer
138 views

Are RTG-powered spacecraft restricted to only some launch vehicles? [duplicate]

This answer by PearsonArtPhoto mentions for spacecraft powered by an RTG there's "only a single rocket that can launch them (Atlas rockets)". Of course that probably doesn't apply to non-US launches, ...
1
vote
0answers
73 views

Commercial 3DoF/6DoF trajectory simulation and optimization tool for launch vehicle

Is there any 3DoF/6DoF trajectory simulation and optimization tool for launch vehicles like POST available commercially? If there whether it's how reliable when it comes to using for real-time ...
1
vote
1answer
84 views

What is the purpose of the pairs of cylinders on the interstage of PSLV?

In the following images, it can be seen that the interstage (separating the first stage PS1 and the second stage PS2) of the Indian Space Research Organisation's (ISRO) Polar Satellite Launch Vehicle (...
2
votes
1answer
140 views

Can a lighter rocket lift more than a heavier rocket?

Let us consider two launch vehicles - "A" and "B". If "A" has a larger wet mass than "B", does this imply "A" has a higher payload capacity to a particular orbit, from a particular launch site than "B"...
0
votes
2answers
187 views

Are solid-fueled launch vehicles faster to orbit than liquid-fueled ones?

The (relatively) new Kuaizhou family of launch vehicles is described as "quick-reaction", and is based on ASAT and ICBM heritage. Solid-fueled rockets have been, historically, cheaper to launch on, ...
14
votes
4answers
2k views

Why do we need dedicated launch vehicles for small satellites?

The Wikipedia webpage on Small-lift launch vehicle gives a huge list of dedicated launch vehicles with a maximum payload capacity of 2,000 kg (4,400 lb) for small satellites, which are either retired,...
3
votes
1answer
348 views

Why doesn't Ariane-5 lift off at T=0 seconds?

I have seen Ariane-5 lift off at T+07 seconds and not at (or close to) T=00 seconds. The following statement is from the Ariane-5 User's Manual (Page 35, Section 2.3 - Typical Mission Profile): The ...
6
votes
2answers
514 views

How many space launch vehicles are under development worldwide?

I need to know how many space launch vehicles (across categories - small, medium , heavy etc) are under development, worldwide. For instance this report talks only about the number of Small Space ...
1
vote
1answer
117 views

If a comet-sniffing spacecraft were launched today, could it catch up to newly-discovered ε>3 C/2019 Q4 (Borisov)?

As found in this answer to What makes scientists already so certain that Comet C/2019 Q4 (Borisov) is a comet and not an asteroid? the orbital parameters of this eccentricity > 3 visitor to our solar ...
6
votes
1answer
128 views

What is “additional line load” [N/mm] for the Ariane 5 launch vehicle?

In the textbook Spacecraft Systems Engineering 4th ed. page 14, table 2.1 ("Acceleration values for the Ariane 5 launch vehicle") provides data on the loading of the Ariane 5 spacecraft. One of the ...
2
votes
3answers
492 views

Why don't launcher rockets ordinarily have names?

There are names for the class or family of launcher, e.g. Delta IV, Electron, Falcon. Sometimes the launcher is "named" for a specific configuration of a class, e.g. "Delta IV Medium+ (4,2)", "Chang ...
5
votes
1answer
148 views

Launch vehicle trajectory tool for ascent phase to orbit using PYTHON

Currently, I am developing a trajectory optimization tool for launch vehicle from lift-off to orbit using python for my project. Since I'm new to optimization problem, I am finding it hard to ...
2
votes
1answer
310 views

If there “won't be” rockets to launch individual cubesats, then why did JAXA build exactly that? (SS-520-xx)

The question Why isn't there a rocket to launch a single cubesat? has several good answers that explain why there isn't and/or will not likely be one, based mostly on commercial viability, consistent ...
4
votes
1answer
207 views

Is the space shuttle the only launcher that jettisson tank without any engines in its staging process?

All launcher I know jettison stages composed of both tank and engines. I do understand that: the jettison process is useful to get rid of dead weight jettison engines allows the use of more suited ...
7
votes
1answer
351 views

Why aren’t rocket stages modular and interchangeable?

Being an avid player of Kerbal Space Program, it is intensely frustrating to return to the real world and have to remind myself that rocket stages can’t generally be swapped out between rockets (...
3
votes
2answers
636 views

Why was the Energia’s payload capacity to lunar orbit greater than its payload capacity to geosynchronous orbit?

The Energia rocket, developed in the 1970s and 1980s to launch the Soviet Buran space shuttle, had the second-highest payload capacity (100 tonnes to LEO) of any rocket ever flown (and the highest-...
1
vote
1answer
216 views

How often did launch vehicles have a “Stage 0”, and what does it mean exactly?

While trying to do some reading for the question Need help understanding staging shown in infographic of Titan launch of Hexagon satellites I ran across the Wikipedia article for Titan III. This ...
2
votes
1answer
88 views

Need help understanding staging shown in infographic of Titan launch of Hexagon satellites

The NPR News item I Spy, Via Spy Satellite: Melting Himalayan Glaciers discusses use of declassified historical satellite images that include glaciers, and link to the newly published and Open Access ...
3
votes
3answers
301 views

Why does the Falcon 9 launch heavier payload in LEO than Ariane V and the other way around for GTO?

Browsing a comparison of orbital launch systems on wikipedia, I notice that launcher capable of launching payload in GTO can launch in GTO approximately all the mass of the payload they can launch in ...
0
votes
1answer
80 views

GLOM of a launch vehicle

What do you mean by GLOM of a launch vehicle? When I googled about it, it says it is a type of mass but I am unclear about it.
6
votes
1answer
80 views

History of multiple-payload launches?

Another question asks why Spirit and Opportunity weren't launched together. My gut response was that multiple-payload launches were less common then than they are today, but I don't actually know if ...
0
votes
1answer
100 views

How common are “parallel stages” in a launch vehicle?

I'm being told in this answer and in this comment that the fourth stage of the Farside rocketoon lies in the center of the four "cores" of the third stage. See this answer for several pictures of ...
12
votes
1answer
464 views

Was there any period of time when other U.S. launchers were abandoned in favor of the Shuttle?

The comments to this recent question disagree on whether the U.S. briefly abandoned other launch systems in favor of the Space Shuttle. The Shuttle was designed to be capable of bringing all U.S. ...