Author Topic: Red Dragon Discussion Thread (2)  (Read 220767 times)

Online guckyfan

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Re: Red Dragon Discussion Thread (2)
« Reply #740 on: 05/12/2017 05:33 PM »
No need to waste a Dragon for that. The com sats have their own Hall thruster. With enough propellant they can brake into orbit on their own. Send one or two in the trunk and deploy them early. Or send a whole bunch of them on a dedicated F9 launch.

Offline rsdavis9

Re: Red Dragon Discussion Thread (2)
« Reply #741 on: 05/12/2017 05:53 PM »
No need to waste a Dragon for that. The com sats have their own Hall thruster. With enough propellant they can brake into orbit on their own. Send one or two in the trunk and deploy them early. Or send a whole bunch of them on a dedicated F9 launch.
I didn't think a f9 had enough delta-v(with light payload) to get to mars?
With ELV best efficiency was the paradigm. The new paradigm is reusable, good enough, and commonality of design.
Same engines. Design once. Same vehicle. Design once. Reusable. Build once.

Offline Ictogan

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Re: Red Dragon Discussion Thread (2)
« Reply #742 on: 05/12/2017 06:15 PM »
No need to waste a Dragon for that. The com sats have their own Hall thruster. With enough propellant they can brake into orbit on their own. Send one or two in the trunk and deploy them early. Or send a whole bunch of them on a dedicated F9 launch.
I didn't think a f9 had enough delta-v(with light payload) to get to mars?
It can do 4t to Mars.

Offline Kaputnik

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Re: Red Dragon Discussion Thread (2)
« Reply #743 on: 05/12/2017 06:25 PM »
Might they attempt aerocapture with one of the RDs? it'd be a good test for when they eventually send a bunch of comm/gps sats to Mars.

Also, might they test their life support system on one of the RDs? it wouldn't have a 'load' without people but it would be a good longevity test, and quite a PR coup. "The first livable place on Mars." maybe even send the plant that got Elon started so many years ago.

They would have to drop the trunk prior to entry, leaving the Dragon with no solar power- so it wuld have to proceed to landing immediately, or have a very short orbital mission.
Waiting for joy and raptor

Offline Jimmy Murdok

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Re: Red Dragon Discussion Thread (2)
« Reply #744 on: 05/13/2017 02:31 AM »
They would have to drop the trunk prior to entry, leaving the Dragon with no solar power- so it wuld have to proceed to landing immediately, or have a very short orbital mission.

Why? The trunk is just to carry items. It does deploy stuff into the ISS without self disposing itself. Only need a deploying mechanism.

Offline Phil Stooke

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Re: Red Dragon Discussion Thread (2)
« Reply #745 on: 05/13/2017 02:47 AM »
The trunk carries the solar arrays.

Offline mikelepage

Re: Red Dragon Discussion Thread (2)
« Reply #746 on: 05/13/2017 03:54 AM »
Also, might they test their life support system on one of the RDs? it wouldn't have a 'load' without people but it would be a good longevity test, and quite a PR coup. "The first livable place on Mars." maybe even send the plant that got Elon started so many years ago.

This is my thinking.  At first, they probably wouldn't send anything which is actually alive for planetary protection reasons, but I'd assume something close to standard temperature/pressure will be necessary for ISRU operations in order to be able to pump liquid water.


Online guckyfan

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Re: Red Dragon Discussion Thread (2)
« Reply #747 on: 05/13/2017 06:06 AM »
The trunk carries the solar arrays.

And the radiator. Dragon does not survive without the trunk.

Offline woods170

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Re: Red Dragon Discussion Thread (2)
« Reply #748 on: 05/13/2017 01:17 PM »
The trunk carries the solar arrays.

And the radiator. Dragon does not survive without the trunk.
In fact it does. Just not for very long. But long enough to get to the surface.

Online guckyfan

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Re: Red Dragon Discussion Thread (2)
« Reply #749 on: 05/13/2017 02:19 PM »
The trunk carries the solar arrays.

And the radiator. Dragon does not survive without the trunk.
In fact it does. Just not for very long. But long enough to get to the surface.

We were talking about braking into orbit though.

Offline woods170

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Re: Red Dragon Discussion Thread (2)
« Reply #750 on: 05/13/2017 04:25 PM »
The trunk carries the solar arrays.

And the radiator. Dragon does not survive without the trunk.
In fact it does. Just not for very long. But long enough to get to the surface.

We were talking about braking into orbit though.
Yeah I know. And given that that won't happen you don't have the potential associated problems.

Offline Star One

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Re: Red Dragon Discussion Thread (2)
« Reply #751 on: 05/17/2017 08:12 PM »
This article seems most appropriate in here.

Elon Musk is rushing to beat NASA to Mars, perhaps during Trump presidency

https://www.cnbc.com/amp/2017/05/17/elon-musk-is-rushing-to-beat-nasa-to-mars-perhaps-during-trump-presidency.html

Offline Dalhousie

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Re: Red Dragon Discussion Thread (2)
« Reply #752 on: 05/17/2017 10:35 PM »
This article seems most appropriate in here.

Elon Musk is rushing to beat NASA to Mars, perhaps during Trump presidency

https://www.cnbc.com/amp/2017/05/17/elon-musk-is-rushing-to-beat-nasa-to-mars-perhaps-during-trump-presidency.html

So many errors in that article is hard to understand how a supposedly reputable news agency could make them.
"There is nobody who is a bigger fan of sending robots to Mars than me... But I believe firmly that the best, the most comprehensive, the most successful exploration will be done by humans" Steve Squyres

Offline Star One

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Re: Red Dragon Discussion Thread (2)
« Reply #753 on: 05/17/2017 10:36 PM »
This article seems most appropriate in here.

Elon Musk is rushing to beat NASA to Mars, perhaps during Trump presidency

https://www.cnbc.com/amp/2017/05/17/elon-musk-is-rushing-to-beat-nasa-to-mars-perhaps-during-trump-presidency.html

So many errors in that article is hard to understand how a supposedly reputable news agency could make them.

What are they then?

Offline JamesH65

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Re: Red Dragon Discussion Thread (2)
« Reply #754 on: 05/18/2017 11:07 AM »
This article seems most appropriate in here.

Elon Musk is rushing to beat NASA to Mars, perhaps during Trump presidency

https://www.cnbc.com/amp/2017/05/17/elon-musk-is-rushing-to-beat-nasa-to-mars-perhaps-during-trump-presidency.html

So many errors in that article is hard to understand how a supposedly reputable news agency could make them.

What are they then?

Mostly the words they used.

Offline Star One

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Re: Red Dragon Discussion Thread (2)
« Reply #755 on: 05/18/2017 11:08 AM »
This article seems most appropriate in here.

Elon Musk is rushing to beat NASA to Mars, perhaps during Trump presidency

https://www.cnbc.com/amp/2017/05/17/elon-musk-is-rushing-to-beat-nasa-to-mars-perhaps-during-trump-presidency.html

So many errors in that article is hard to understand how a supposedly reputable news agency could make them.

What are they then?

Mostly the words they used.

Well that's helpful.....

Offline su27k

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Re: Red Dragon Discussion Thread (2)
« Reply #756 on: 05/18/2017 12:09 PM »
This article seems most appropriate in here.

Elon Musk is rushing to beat NASA to Mars, perhaps during Trump presidency

https://www.cnbc.com/amp/2017/05/17/elon-musk-is-rushing-to-beat-nasa-to-mars-perhaps-during-trump-presidency.html

So many errors in that article is hard to understand how a supposedly reputable news agency could make them.

What are they then?

Mostly the words they used.

Well that's helpful.....

LOL, seriously I read the entire article and I didn't see any errors, some numbers may be argued but not indefensible. But I'm not sure why the article is here, it has no new information, Red Dragon is literally just mentioned in one sentence, it's mostly just an overview of SpaceX and the Mars plan for layperson.

Offline envy887

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Re: Red Dragon Discussion Thread (2)
« Reply #757 on: 05/18/2017 01:48 PM »
What are they then?

Quote
But this vision also presents a unique set of challenges. Before SpaceX can land its first manned mission on the Red Planet, engineers need to develop the company's planned Interplanetary Transport System, a two-part vehicle combining the most powerful rocket ever built, and a massive spacecraft designed to carry at least 100 people to Mars per flight.
After hauling the spaceship into Earth orbit, the ITS rocket will return to Earth, where it or another rocket will then carry a fuel tanker into orbit to rendezvous with and fuel up the orbiting spaceship (which will initially launch with very little fuel on board so it can carry more people and cargo).
Once fueled, the spaceship will light its own thrusters — nine of the Raptor engines SpaceX successfully test-fired for the first time in September — and blast off toward Mars. Musk expects the ITS spaceship to make the trip in just 80 days, far shy of the six to nine months it currently takes spacecraft to travel to Mars.

ITS is designed to carry up to 100+ people, not at least 100 on every flight. Some will have none at all.

The launch sequence for ITS is a bit confusing; the only part that goes to orbit and immediately back is the fuel tanker, not the "rocket" which probably means booster. For a mainstream article this isn't too bad though.

ITS could make the trip in as little as 80 days on a favorable alignment, so this is a little misleading. But it does get the factual point across that SpaceX is targeting very fast transfers.

Quote
While it may happen during Trump's presidency, there's no indication that Musk and company will stop pushing for it—potentially dragging NASA and the U.S. government along with them if necessary, Caceres says.


Makes a lot more sense as "While it may NOT happen during..."

Otherwise the article is factually correct statements or reasonable informed opinions. It's solid for a mainstream article about space.

Offline TheKutKu

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Re: Red Dragon Discussion Thread (2)
« Reply #758 on: 07/16/2017 10:58 AM »
Someone on reddit said that "Red Dragon is canned for the foreseeable future, if not forever." according to some employees. Can anyone comment/confirm/deny it?

Online Robotbeat

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Re: Red Dragon Discussion Thread (2)
« Reply #759 on: 07/16/2017 02:09 PM »
Someone on reddit said that "Red Dragon is canned for the foreseeable future, if not forever." according to some employees. Can anyone comment/confirm/deny it?
A later comment notes they're going for an intermediate vehicle or straight to BFR.

SpaceX was going to build and launch Red Dragon with their own money. I suspect they figured it'd be better spent going straight to BFR or some intermediate.

I don't think this is a bad decision.
« Last Edit: 07/16/2017 02:10 PM by Robotbeat »
Chris  Whoever loves correction loves knowledge, but he who hates reproof is stupid.

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