Questions tagged [launch]

Questions regarding the takeoff or the liftoff phase of the flight of a rocket and the set of activities required for preparation of the launch vehicle leading to it.

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9
votes
1answer
2k views

Speed-mass graph of starting rocket?

Could someone provide a graph of speed vs mass of a typical spacecraft - say, Soyuz or Dragon, as it rises towards LEO? If not graph, then a single fixed point of mass at speed of 2 km/s will do. ...
13
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2answers
2k views

What are the mystery Falcon 9 v 1.1 objects?

There are 20 objects in orbit associated with the Falcon 9 v 1.1 launch. So far only 1 has been identified. 5 were payloads of the launch, plus the booster and some debris. Bottom line, 11 objects ...
13
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1answer
411 views

Primary payload influence on hitchhiking CubeSat integration and testing?

Integration is the process of assembling or otherwise combining the separate subsystems into your final overall system. Testing involves making sure your components, subsystems, and overall system ...
11
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2answers
588 views

Payload mass scale economy

What is the "payload mass" curve in relation to "cost to orbit?" I mean: preparing a whole launch system for delivering a single cubesat to LEO would be an overkill, the cost to bring such a small ...
8
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1answer
440 views

Does cost to orbit make the sale for a satellite launch service?

Wikipedia writes to say ...The Space Race sparked unprecedented increases in spending on education and pure research, which accelerated scientific advancements and led to beneficial spin-off ...
5
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0answers
1k views

What is the average cost of satellite construction over the last 10 years? [closed]

In the last 10 years what was the Highest and lowest, construction cost of satellites launched? What are the mean and average costs of satellite construction over the same period? Where "a" ...
7
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1answer
476 views

Would a frog on the side of a rocket be enough to steer it substantially offcourse?

Recently, someone posted this picture in The Pod Bay, our chatroom: It shows a frog being blown off of the launch of LADEE, a lunar probe. It got me thinking: Would a frog, successfully holding on ...
4
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1answer
276 views

Launch from the top of high places [duplicate]

Would launching space ships at the top of high places (like buildings or mountains) would have significant effect? What would be the height where launching would be less energy-/fuel-consuming than ...
3
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1answer
1k views

What advantage or disadvantage when the craft moves through the axis of rotation?

Spacecraft typically launch close to the equator along Earth's rotation. This contributes some velocity to the craft. In addition Earth's gravity is weakest along the equator (bar mountainous regions)....
6
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2answers
917 views

Can a “free launch” from a space elevator really be free?

The question Benefit of sling shot effect with a space elevator implies that you can get free $\Delta V$ from a space elevator launch. As highlighted in this answer on SciFi quoting Sheffield book "...
25
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2answers
2k views

What are the possible legal consequences of an unauthorized launch of a satellite?

Consider the situation, where the private company (let's say, registered on some Caribbean country, but owned by the citizen of United States) does the unauthorized launch of satellite or other ...
17
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2answers
569 views

Can solid fuel leak?

Recently the ISRO GSLV launch was called off on account of a fuel leak. Other launches too have, on occasion, been called off for similar reasons. Fuel used to launch a craft to orbit may be solid, ...
11
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3answers
507 views

Have all spacecraft on record been launched from land?

Water is a little buoyant which may be part of the reason a lot of commerce happens on the waves. How much of a difference in terms of fuel would it make if the craft were launched from a water-body?...
9
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1answer
2k views

During launch, how is the launch vehicle tracked?

Obviously a launch vehicle needs to be tracked quite precisely during launch, but how is this accomplished? Is it all done from the ground, or do launch vehicles normally fly with GPS receivers? Is ...
20
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2answers
444 views

Does the Perseid peak affect mission launches?

Tonight (Aug 12 2013) is the annual peak of the Perseid meteor shower. Since meteors are chunks of rock flying through the atmosphere at crazy high speeds, I'm wondering if there are any ...
16
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4answers
5k views

Could a ship take off from Earth using ion thrusters?

If you had enough ion thrusters, could you take off from Earth's surface into low Earth orbit? If not, why not?
6
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3answers
255 views

Are payload and impulse the sole criteria to decide the engine?

There do not appear to be a definite number of stages to launch a craft. Amongst others entries under the 'launch', 'spacecraft-development' tags mention as many as 4 stages. Engines and fuel vary too....
15
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1answer
2k views

Why are satellites and other payloads always placed at the top of rockets?

In all rockets that launch satellites to orbit, the satellite is always placed at the top. Why are payloads always placed at the top of rockets?
8
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1answer
1k views

Gravity drag Delta-v calculation for launches to orbit

It would appear that gravity drag has a exact formulation for an instantaneous moment in a rocket launch. I'm tempted to think that some calculus could get you an exact number for Delta-v of an ...
7
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1answer
414 views

Does the delta v requirement of a rocket to place a satellite in orbit depend on the position of other planets?

Does the necessary delta v given to a satellite (earth orbiting) by the rocket during its launch depend on the positions of other planets? Please justify your answer.
5
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0answers
120 views

How much cheaper would a high level launch be from a sea level launch? [duplicate]

What is the difference in delta-V required for a launch from the highest natural point on Earth (about 8,800 m or 29,000 ft) as opposed to a sea level launch? Assuming a completely ground based ...
5
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1answer
90 views

Would fuel depots allow lighter fuel tanks for post LEO use?

In addition to the benefits of smaller and more frequent launches (and perhaps other benefits), could fuel depots also provide a modest benefit in reducing the mass of fuel tanks for vehicles leaving ...
2
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0answers
77 views

When is Fēngyún-3C planned to launch? [closed]

When is Fēngyún-3C planned to launch? The CEOS/ESA EO Handbook states July 2013, but this was last updated October 2012, and I don't think it's actually been launched. WMO-sat.info says >= 2013, but ...
7
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3answers
476 views

What is the basic idea of the Truax “Space Truck”?

Robert Truax is said to have advocated a "space truck". From the NYT: He did calculations showing that complexity, not size, drove costs. Hence, his proposed “space truck,” two football fields ...
17
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2answers
1k views

Is it more efficient to assemble spacecraft in orbit, or assemble on the ground and launch?

My friends and I were trying to figure this out a while ago. I was thinking that by transporting smaller pieces into space via a lighter re-entry spacecraft, there would be overall less fuel used ...
21
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1answer
772 views

Is there any ongoing research in nuclear pulse propulsion?

Nuclear pulse propulsion seemed to be quite actively researched up until the 1990's, with a few projects that saw some rather promising results (some that could theoretically reach over 4% light speed....
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0answers
83 views

What are the barriers to partial nonrocket spacelaunch? [closed]

What technological and financial barriers prevent proposals for partial nonrocket spacelaunch such as magnetic levitation trains from becoming a reality? These systems, if created, could ...
9
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2answers
357 views

Are there any significant differences in launch failure rates between different agencies/countries?

NASA, ESA, Roscosmos, and others, all have somewhat different cultures and attitudes when it comes to building and launching spacecraft. I don't have a source, but one anecdote I heard from someone ...

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