Author Topic: SpaceX Falcon 9 : Iridium NEXT Flight 4 : December 22/23, 2017 : Discussion  (Read 80695 times)

Offline Eagandale4114

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How far away from Vandenburg was the farthest confirmed viewing of the launch. We saw it very clearly here in San Diego, it was spectacular. But San Diego is not that far from the ground track, there is video from Phoenix. Anything farther away?

Some guys in Tucson were able to see it! There were some pictures on reddit. I forget the user but they posted this.

Offline Lar

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it's a moot point regardless - as SpaceX has specifically said that without bottom mounted RCS they don't have enough control authority for that level of precision. I wouldn't anticipate that they will put any development into cradle landing on the Falcon family. They are already gearing up for the BFR family development and will engineer in that type of fine control from the outset.

 

I think it is possible to take a flown stage and make it into a mule, including adding bottom mounted RCS, to do these kinds of tests. However I don't think it's necessarily cost effective. I also don't think we'd ever see it on a customer flight.

...I expect the first mules will be Raptor engined. Which means off topic for here.
"I think it would be great to be born on Earth and to die on Mars. Just hopefully not at the point of impact." -Elon Musk
"We're a little bit like the dog who caught the bus" - Musk after CRS-8 S1 successfully landed on ASDS OCISLY

Offline dcporter

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Apologies, morning confident that this has been discussed but it will have been back ?? pages: what happened to booster recovery this mission?

Apologies, morning confident that this has been discussed but it will have been back ?? pages: what happened to booster recovery this mission?

This booster was not recovered, hence no booster recovery thread.

Offline Yeknom-Ecaps

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Was there a payload fairing recovery attempt? If so, any results?

Was there a payload fairing recovery attempt? If so, any results?

Probably since Mr Steven moved in the area, but it seems we'll have to wait for her to return to see whether they've succeeded or not.

Online speedevil

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I think it is possible to take a flown stage and make it into a mule, including adding bottom mounted RCS, to do these kinds of tests. However I don't think it's necessarily cost effective. I also don't think we'd ever see it on a customer flight.

...I expect the first mules will be Raptor engined. Which means off topic for here.

They have said it doesn't have enough control authority, which presumably is true for the assumptions made, and no on-vehicle mods.

Several things might in principle be done to make those assumptions not hold with limited investment.
A) Much, much better wind prediction for landing winds.
    Taking the mispredicted worst case error from winds from 10m/s over the last 4 seconds to 0.5m/s. Feeding a local instantaneous wind model from high power LASER based doppler radar for studying wind flow out to ~200m, a swarm of drones at 200m radius, or even something as simple as a field of anemometers.
B) Non-fixed cradle
   This might vary from at the high end something able to dynamically control orientation and position of the cradle to catch and slow the caught stage to rest. Or, rather more simply, to accelerate at Tesla truck type speeds, tracking the predicted optimal impact point, then clamp to the deck after braking rapidly.

B) is clearly (probably) useless for a BFR with properly sized control thrusters.

However, A) might be moderately useful for BFR, and perhaps even more useful in the near-term for fairing recovery.
Might even be useful for the rather sillier idea of catching S2 in a net.

Offline dcporter

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Apologies, morning confident that this has been discussed but it will have been back ?? pages: what happened to booster recovery this mission?

This booster was not recovered, hence no booster recovery thread.

Yes right sorry, I was asking why there was no booster recovery, not why there was no thread.

Online hkultala

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Apologies, morning confident that this has been discussed but it will have been back ?? pages: what happened to booster recovery this mission?

This booster was not recovered, hence no booster recovery thread.

So, who is the first to recover some parts of it with a submarine?

The chinese, to py on spacx tech?


Online FutureSpaceTourist

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Quote
I think last night might have been the biggest Rorschach test ever

https://twitter.com/elonmusk/status/944700127100497920

Quote
Having a sinking feeling that most people actually do think it was aliens …

https://twitter.com/elonmusk/status/944779560104574977

Quote
So strange that people often believe things inversely proportionate to the evidence. Given a set of possible explanations, why pick the extremely unlikely one!?

https://twitter.com/elonmusk/status/944787213430034432
« Last Edit: 12/24/2017 06:05 AM by FutureSpaceTourist »

Apologies, morning confident that this has been discussed but it will have been back ?? pages: what happened to booster recovery this mission?

This booster was not recovered, hence no booster recovery thread.

Yes right sorry, I was asking why there was no booster recovery, not why there was no thread.

Seems like Block 3s are starting to be phased out in favor of Block 4 and soon Block5 cores.
« Last Edit: 12/24/2017 10:52 AM by tvg98 »



So I was wondering whether there were accidents caused by people being distracted with the launch, and sure enough it happened.

PS: Some strong language's present

Offline cambrianera

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Apologies, morning confident that this has been discussed but it will have been back ?? pages: what happened to booster recovery this mission?

This booster was not recovered, hence no booster recovery thread.

Yes right sorry, I was asking why there was no booster recovery, not why there was no thread.

Maybe they had no set of legs available.
Three sets are matched to the FH boosters, one set is on Zuma.
The legs are ligth, but not cheap.
Oh to be young again. . .

Offline Herb Schaltegger

Apologies, morning confident that this has been discussed but it will have been back ?? pages: what happened to booster recovery this mission?

This booster was not recovered, hence no booster recovery thread.

Yes right sorry, I was asking why there was no booster recovery, not why there was no thread.

Maybe they had no set of legs available.
Three sets are matched to the FH boosters, one set is on Zuma.
The legs are ligth, but not cheap.
This booster was previously-recovered. There's not a shortage of legs.

And there's some insight on L2 about why the booster wasn't recovered and lack of legs wasn't the reason.
Ad astra per aspirin ...

Offline Skylab

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Mr. Steven, reportedly charged with capturing a fairing has been in port for some time now. Hope we get to see some results soon!

Offline Oersted

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So I was wondering whether there were accidents caused by people being distracted with the launch, and sure enough it happened.

PS: Some strong language's present

The US is finally catching up to Russia when it comes to dashcam excitement!

Offline Nomadd

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So I was wondering whether there were accidents caused by people being distracted with the launch, and sure enough it happened.

PS: Some strong language's present

The US is finally catching up to Russia when it comes to dashcam excitement!
It kind of looks like we're returning fire for Chelyabinsk.

Offline Stan Black

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In this age of recycle and environment considerations, and Blue Planet II, I find dumping a rocket that can be recovered leaving me conflicted.

OTOH think of all the diesel they saved by not steaming out there with an ASDS...
But yeah I kind of agree with you. Single-use launch vehicles are starting to look like how we used to do this...
In a strange way, the idea of dumping a reused booster actually validates the economics of reuse.

Recalling the days when people said "They'll never be able to recover them" which quickly turned into "They can recover them, but they won't be able to refly them." Now, they're so successful at recovery that they can actually make a business decision about expending a booster after one reflight.

Those kinds of economic profit-and-loss decisions are what you'd expect if reuse was actually about profitability and not just one charismatic rich guy's obsession.

Should the rocket be dumped in the sea or recovered then scrapped?
« Last Edit: 12/24/2017 02:48 PM by Stan Black »

Offline sevenperforce

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In a strange way, the idea of dumping a reused booster actually validates the economics of reuse.

Recalling the days when people said "They'll never be able to recover them" which quickly turned into "They can recover them, but they won't be able to refly them." Now, they're so successful at recovery that they can actually make a business decision about expending a booster after one reflight.

Those kinds of economic profit-and-loss decisions are what you'd expect if reuse was actually about profitability and not just one charismatic rich guy's obsession.

Should the rocket be dumped in the sea or recovered then scrapped?
Exactly.

Offline hootowls

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In this age of recycle and environment considerations, and Blue Planet II, I find dumping a rocket that can be recovered leaving me conflicted.

OTOH think of all the diesel they saved by not steaming out there with an ASDS...
But yeah I kind of agree with you. Single-use launch vehicles are starting to look like how we used to do this...
In a strange way, the idea of dumping a reused booster actually validates the economics of reuse.

Recalling the days when people said "They'll never be able to recover them" which quickly turned into "They can recover them, but they won't be able to refly them." Now, they're so successful at recovery that they can actually make a business decision about expending a booster after one reflight.

Those kinds of economic profit-and-loss decisions are what you'd expect if reuse was actually about profitability and not just one charismatic rich guy's obsession.

Should the rocket be dumped in the sea or recovered then scrapped?

(Non reflight booster) Dumped unless someone pays for recovery. ASDS deployment itself (excluding the rest of the booster handling) is not inexpensive. And there’s the risk of damage to the ASDS that might impact the schedule of a needed recovery.

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