Linked Questions

17
votes
5answers
5k views

Reusable spacecraft: why still have fairings detach, instead of open/close?

Why do reusable rockets (e.g. SpaceX Falcon 9) still utilize detachable fairings? SpaceX keeps trying to find a way to recover the $6M fairings for obvious cost saving reasons, why not have them ...
28
votes
3answers
10k views

What makes 21st century fairings so valuable that they'd potentially be recovered and re-used?

I've read in @geoff's answer that SpaceX is doing some experimentation that may lead to fairing recovery capability. In fact I remember hearing Elon Musk mentioning a few years ago that it was being ...
20
votes
2answers
2k views

What are the two bright objects separating from the Falcon 9?

On the recent Iridium 1 launch the separation of the first and second stages can be seen at T+3:50. In the following screenshot we see the second stage burning at the lower left of the frame and the ...
10
votes
4answers
5k views

Where can I find data for Atmospheric density vs. altitude?

I'm looking for information on atmospheric density in Earth orbit. All the atmospheric density tables and graphs I've found go no higher than 100 km. Definitions like the US Standard Atmosphere don't ...
6
votes
2answers
2k views

Do each of the fairing halves now use thrusters post-deployment? How does that work?

From Reddit Recap of the Elon Musk and Martin Halliwell press conference with lots of new info, March 31, 2017 (presumably not related to April fools day in some time zones?) Fairing and future ...
7
votes
1answer
2k views

How to determine $\Delta v$ loss due to gravitational pull from earth

How do I find the delta-v loss of a rocket while ascending to its apogee? Specification of Atlas V 541 rocket: Specification for Atlas V first stage: Dry Mass: 21054 kg Fuel and Oxidizer(RP1/LOX) ...
8
votes
2answers
1k views

Why did this fairing separation happen at such a high altitude? (SpaceX Iridium-6/GRACE-FO)

I noticed in the video of the recent Iridium-6/GRACE-FO launch that the fairing separation happened at an altitude of about 143 kilometers. This is significantly higher than any altitude I can ...
6
votes
1answer
565 views

Why are 22N and 440N liquid engines quite common?

One can often spot that liquid apogee engines are 440 N and attitude control systems are 22 N. Is there a reason why the thrusts are proportional? If the engines are scaled for reducing development ...
15
votes
1answer
634 views

How many people have returned to Earth in a different type of vehicle than the one that launched them into space?

Recently we had the 15 year anniversary of Expedition 1 of the ISS. That particular crew launched in a Soyuz (TM-31) and returned on a Space Shuttle (Discovery, STS-102), which I found a remarkable ...
7
votes
1answer
743 views

What was the object seen from the stage 2 camera of the CRS-10 launch at T+3:12

During the SpaceX launch of the CRS-10, at T+3:12, there is a circular grey object that passes through the frame. What is this? Launch Webcast
6
votes
1answer
424 views

Simulating launch velocity of falcon 9

Help! I finished my numerical simulation of falcon 9 launch in google sheets, where I calculate all the value changes with time. But, when I looked at real launch to compare the values, I got really ...
9
votes
2answers
948 views

SpaceX Falcon-9 fairing heating during launch?

In watching the SpaceX SES-12 launch last night, I noticed what looked like the fairing of the rocket glowing a bit a while after launch. This was most obvious in the SpaceX video SES-12 Mission ...
6
votes
1answer
276 views

How do ships catch fairings? Can fairings steer or do the ships do all the work?

A comment in The Pod Bay says it all: ...fourth Starlink payload launched. Booster landed on OCISLY. (Has now launched three times, LC-39A, SLC-40, SLC-4W once at each launch pad they own!) And they ...
2
votes
0answers
275 views

Infrared space interferometry - Why isn't it being done?

Spektr-R is a 10 meter diameter radio telescope in Earth's orbit with an apogee of 338,000 km, nearly a Lunar distance. It does interferometry together with the Very-Long-Baseline Interferometry ...
2
votes
0answers
179 views

Payload fairing separation- Event based or time based?

Refer the answer for this question How strong and "hot" is the wind on the payload after the fairing is deployed at ~110km? It is clear that the fairings are separated when the free ...