Questions tagged [falcon9-r]

Variant of the SpaceX Falcon 9 rocket with reusable first and second stages using recovery systems demonstrated by the SpaceX Grasshopper and F9R-Dev1.

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23
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4answers
4k views

How does the Falcon 9 know where the landing barge/pad is?

The descending Falcon 9 has got to hit (preferably gently) the tiny target of the Autonomous Spaceport Drone Ship (ASDS) in the middle of the ocean. How does the Falcon 9 know where the ASDS is? ...
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Will SpaceX attach its fairings to a booster to recover them?

Elon Musk has said that SpaceX is going to try to recover the fairings that protect the payloads on the upper stage. If SpaceX were to try and 'fly' the fairings back safely, they would have to add ...
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Why does the SpaceX reusable launcher use vertical rather than horizontal landing?

As alternatives to vertical retro-engines landing: horizontal landing using wings, already discussed in Why is it preferable for SpaceX to land their booster vertically rather than fly it down with ...
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1answer
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What was the first time a “re-used booster” was used to put a payload into orbit?

In the excitement about SpaceX's Falcon recovery and relaunch development program, it's often forgotten in articles like this one that reusable spacecraft were in regular use far back in the 20th ...
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Avionics Systems on board Falcon 9 (Reusable)

What kind of control systems are active and how do they function on board a Falcon 9 booster while it's landing ?
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3* Tonnes Unaccounted for in Falcon 9 FT Weight Wikipedia Calculation?

On the Falcon 9 FT Wikipedia page, the fully fuelled weight of Falcon 9 is only 546 300kg instead of 549,054kg as stated on SpaceX website. 546,300 kg - Wikipedia ...
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2answers
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Why does the SpaceX first stage booster boost up and back after separation not just back?

By boosting up and back after separation aren't you just putting more energy in that you'll have to counter with additional deceleration later? Why not just accelerate back, which will use less energy ...
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2answers
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How does the Falcon 9 first stage avoid burning up on re-entry?

Now that a Falcon 9 first stage has successfully landed after a launch mission, I want to know how the first stage can avoid burning up when coming back down to earth. There doesn't appear to be any ...
16
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1answer
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Cause of apparent plume deflection on SES-10?

While watching the SES-10 flight, starting a little after T+1:30, I noticed that the direction of the first-stage exhaust plume started to diverge from the alignment of the rocket body. The ...
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2answers
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Falcon 9R as SSTO

Seeing as the Falcon 9R first stage is close to being reusable, could it be the basis for an SSTO rocket? In other words, does it have enough performance to make it into orbit, and then boost back and ...
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How will SpaceX achieve landing of the Falcon 9 first stage?

What mechanisms and technologies will be used to control the descent and movement of the falcon 9 rocket's booster stage on its way to the landing pad?
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Is it possible the Falcon Heavy Demo flight could be done with three previously flown boosters?

Thanks to their now recently official reusability capability, and after looking at the SpaceX flight manifest that showcases at least five new v1.1 FT before the Demo, it made me ponder: By the time ...
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Could Falcon 9 splash down IN water?

Why don't they let the Falcon 9 splash down IN water, and then recover it? Wouldn't this reduce both fuel use & potential damage?
26
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1answer
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Falcon 9 design: Why is the cargo fairing so much wider than the lower parts?

Why does the cargo fairing have a much larger diameter than the lower part of the rocket? Of course a larger diameter lets thicker payloads fit. But then the first, inter, and second stage could have ...
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2answers
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Why did SpaceX choose gas thrusters over reaction wheels/CMGs?

For the Falcon 9R, and the Dragon spacecraft, the use thrusters for attitude adjustments on both the stages returning and to control the rotation of the descending Dragon. ...
7
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Was there a barge landing attempt on Launch 16 (EUTELSAT 115 / ABS 3A) March 1st

I've been reading here (SX) and SpaceX website and other sites and can see no reference to any attempt to try the barge landing of the first stage booster on the recent Falcon-9 launch on March 1st. ...
7
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1answer
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What did SpaceX change in the upgrade of the ASDS?

The original ASDS (Autonomous Spaceport Drone Ship known as "Just Read The Instructions" (JRTI) was based on the Marmac 300 hull. It has been replaced with the Marmac 304 hull for use in the CRS-7 ...
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524 views

What are the version number and identification names for each Falcon 9-r boosters?

I would like to track the all the Falcon 9-r boosters that are landing or are attempting to land. I know that the third booster which landed successfully is the F9-0024-S1 but I don't know the ...
3
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1answer
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Falcon 9 - relief valves closing times

From what I understand, prior to the launch, the relief valves are open to allow some of the boiling LOX to evaporate and be replaced with fresh, cold one (we can see oxygen evaporating - and "...
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Difference between BlueOrigin and SpaceX rocket landings?

So, SpaceX has finally landed their booster back to the land. BlueOrigin has achieved the same thing in a recent past, but I have read so many people commenting and criticizing the comparison of ...
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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 ...
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1answer
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What is the cycle life of the Merlin 1D?

I was doing some back of the envelope calculations to see improvements SpaceX would have to make to reach a cost target of $100/kg into orbit. After doing some basic calculations, it seems that SpaceX ...
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Mathematics used for F9R flyback and landing [duplicate]

I was wondering if anyone may have useful links to the mathematics used by the F9R that allowed it to fly back to LZ-1 and land successfully. I'm hoping to find some papers that will give the broadest ...
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How stable would a Falcon 9 first stage be after it has landed on a drone ship?

Presumably, the booster would be a very light, very tall tube (Most of the fuel spent) standing on 4 fairly small legs on a ship in the middle of the ocean. It would also still contain some LOX and ...
14
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How is SpaceX going to land their Falcon first stage?

SpaceX's attempt at a reusable first stage rocket sounds amazing, but how they're going to get it to land back on the launchpad is beyond me. Assuming that the first stage will separate with a speed ...
5
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1answer
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Why is the Falcon 9 charred like this? [duplicate]

Every time we've seen a falcon 9 land or attempt to land, it's had a start change in coloration on the outside, just above the spaceX logo. It seems that the charring/exhaust smoke/residue suddenly ...
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How far downrange would a reusable Falcon 9 first stage land (without fly-back)?

Let's imagine a rocket like the Falcon 9 recovers its first stage via a soft landing, but doesn't attempt a return to the launchpad. For the sake of argument, let's imagine that there are no ...
8
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1answer
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Is it a problem that Falcon 9R landing legs are getting sizzling hot and catching flames during booster landing?

The videos of the test and live landings appear to show smoke and a few times flames coming from the landing legs. Will this be engineered out in later development or is it something else? Would it ...
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Now that they can land a Falcon 9, what will they do with it?

As most of you, I am super stoked by the amazing success of SpaceX with their Falcon 9 first stage landing back on land! We also know that they have a huge backlog (over 50 flights) and are building ...
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Falcon 9 - fuel needed to hop back from a barge

There were multiple mentions of the future ideal first stage ASDS landings - if the mission won't have enough deltaV to do a RTLS, then just land on the barge, refuel and "hop" back to the launch site....
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1answer
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What is the burn time for the F9 boostback / reentry / landing burns?

I'm trying to figure out the timing of the 3 recovery burns and the total fuel reserve needed to perform them. [Answers Inlined] Boostback: [30] seconds of 3-engines at full-thrust. Reentry: [20] ...
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Are the Falcon 9 landing legs aerodynamic surfaces as well?

With the CRS-3 (SpaceX-3) launch of a Falcon 9 v1.1 with a Dragon capsule to the ISS the F-9 will launch with landing legs for the first time. Elon Musk Tweeted an image of the legs mounted on the ...
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Why did SpaceX use LC-13 as LZ-1?

SpaceX got access to LC-13, a former Atlas launch pad, to convert to LZ-1 (Landing Zone 1) for landing Falcon 9 first stages. What considerations went into the decision on using LC-13? Clearly the ...
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Could SpaceX start testing to return the Falcon 9 first stage to land instead of water?

My thinking is that: The primary reason to try to land on a barge instead of land appears to be safety (Answers to this question). Ultimately, it looks like they want to return it to land. SpaceX ...
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1answer
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How far from launchpad did Falcon 9's first stage go?

On December 21st, 2015 on the Orbcomm OG2 mission, Falcon 9's first stage landed 6 miles from its launchpad. What was the highest altitude reached by the first stage, and how far did it go from the ...
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Will we see the barge landing live during the SpaceX CRS-5 webcast?

I wonder if SpaceX will cover the barge lading of the Falcon 9 first stage live during the upcoming launch for the fifth SpaceX cargo mission to the International Space Station or not? NASA TV's CRS-5 ...
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Why not land booster stages in a cone or net?

Why must you land the boosters on a flat surface? Why not aim for a cone a deep net that can accommodate rough seas, winds, etc? A picture is below - obviously I am not an artist nor an engineer.
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1answer
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Could a rocket first stage be rapidly reusable after landing in freshwater?

Landing a first stage rocket (F9R) in the ocean has been stated that it is corrosive and will damage rocket components, thus making rapid reusability impossible or too expensive to repair each ...
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1answer
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What control engineering techniques are used for the landing maneuvers of Falcon 9-R?

Which are the main control theories behind the landing maneuvers of the Falcon 9? For the hovering part, as it approaches the landing surface, I guess the inverted pendulum control approaches would do ...
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Is there any information about the second and further use of first stage of Falcon 9 v1.1 if it will be landed as intended?

Is there any information available about, If first stage of Falcon 9 v1.1 will land as intended: How many times it can be used again? After which time it will be ready for launch? What need to be ...
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When do the landing legs on a Falcon 9R first stage deploy in a landing attempt?

At what point in the flight do the legs deploy on a Falcon 9R landing? Originally they were described as opening fairly early, to help avoid spinning the stage, (cause of first landing failure on ...
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Did CRS-6 landing fail because the steering fins are ineffective at low speed?

Images of the second attempt to land the first stage of the Falcon 9 on a barge, following its successful launch of CRS-6, show how it suddenly swung more than its cold gas engines could compensate ...
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Could a Falcon 9 land carrying its second stage and payload?

I'm afraid this is a highly speculative question, but I wanted to put it out and see if anyone can provide more insight. Let's say that at some time in the future, during a Falcon 9 launch, but ...
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Why did the RCS thrusters on Falcon 9 fire in the wrong direction?

In the video below we can briefly see the valiant attempt of a lone Nitrogen RCS thrust to keep the Falcon 9 upright during the failed landing attempt of CRS-6. However, as the stage continues to tip ...
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ASDS Position during Falcon 9R first stage recovery

For the coming CRS-7 mission to the ISS, where exactly will SpaceX position the ASDS for the Falcon 9R first stage recovery attempt? Obviously it will be in the Atlantic Ocean.
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How will the Dragon 2 perform a pinpoint landing without aerodynamic controls like the F9R did?

On Friday May 6, A SpaceX Dragon capsule successfully completed a pad abort test at Kennedy Space Center. The abort test was performed by the same propulsion system that is envisioned to land Dragon 2 ...
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1answer
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Does SpaceX performed low subsonic speed wind-tunnel runs of Falcon 9 booster in landing configuration and with legs eventually opened?

There are NASA reports on Falcon 9 runs in transonic in wind tunnel. Tests were conducted at several orientations and speeds ranging from Mach numbers 0.3, or 228 miles per hour at sea level, to Mach ...
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When the CRS-6 Falcon 9 first stage hit the ASDS, did the Flight Termination System explode due to the heat of the fire?

In the question: Does the Falcon 9 (v1.1) first stage have an explosive Flight Termination System? It became clear that the Falcon 9/9R first stage has an explosive flight termination system. ...
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Would it have taken much to steady SpaceX's CRS-6 returning stage so it landed alright?

Looking at this pretty awesome video of the CRS-6 first stage almost making it back to the barge, it sort of seems that if something could have steadied it just a bit, it would have been okay. ...
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1answer
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Numbers for Falcon 9 booster MECO scenarios?

I hoping to look at learn more about Main Engine Cut Off (MECO) for various scenarios. 5 quantities I want are: 1) Booster mass at lift off. 2) Booster mass at MECO 3) Booster velocity at MECO (...