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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16
votes
1answer
938 views

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 ...
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? ...
20
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7answers
16k views

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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5answers
7k views

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 ...
55
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2answers
23k views

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 ...
7
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3answers
712 views

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.
26
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1answer
5k views

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 ...
20
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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 ...
18
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2answers
6k views

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?
6
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1answer
2k views

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] ...
14
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3answers
2k views

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?
10
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2answers
2k views

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 ...
68
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5answers
10k views

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 ...
61
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6answers
16k views

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 ...
13
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2answers
4k views

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. ...
8
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1answer
736 views

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 ...
6
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3answers
403 views

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. ...
14
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2answers
3k views

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 ...
14
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1answer
1k views

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 ...
12
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1answer
2k views

What went wrong, Falcon 9 1.1 first flight with first stage landing attempt?

They are reporting that the three engine relight in the upper atmosphere worked. But the relight of a single engine, lower down for pretend landing on the water generated too much torque and the fuel (...
11
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1answer
2k views

Does the Falcon 9 (v1.1) first stage have an explosive Flight Termination System?

Does the Falcon 9 first stage use an explosive FTS? An FTS can operate in many different ways. The key goal is to terminate thrust, break up large chunks of burny stuff, and avoid killing people. A ...
9
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3answers
1k views

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 ...
7
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1answer
590 views

SpaceX Falcon 9 Reusable first stage propellant for return

How much propellant is required to return the Falcon 9 Reusable's first stage after separation?
4
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1answer
834 views

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 ...
3
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2answers
347 views

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.
2
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1answer
1k views

How low can the single Merlin engine on the Falcon 9 first stage throttle?

As I understand it, the Merlin 1D engine on the Falcon 9 that is used to land the first stage, is fairly limited in how low it can throttle. This makes landing on the barge more difficult -- a ...
10
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1answer
550 views

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 (...
9
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3answers
1k views

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 ...
9
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3answers
1k views

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....
8
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2answers
1k views

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 ...
8
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1answer
583 views

Where will SpaceX take CRS-5 after it lands?

If SpaceX's plan to land the CRS-5 first stage on their Autonomous Spaceport Drone Ship goes perfectly, there will be a 50 (ish) meter rocket on a barge in the Atlantic. Leaving aside the interesting ...
3
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3answers
285 views

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 ...