SpaceX And/Or Rocketry In General

Mike Hewson
Mike Hewson
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Looks like a good piece of

Looks like a good piece of work. I reckon they've taken the height & velocity from the usual telecast format ( upper right of screen ). Yes, it is very helpful to understand the flight dynamics. Note how one can get a 6+ G slow down by firing those Merlin's. By then the payload has departed and most of the fuel to do that has been used, so it is a much less massive gadget than at lift off. It may seem counter-intuitive* but the grid fins are worth a heap of fuel that would be otherwise needed to slow the craft down. Thus one may not need to fire up an engine but stick some hands out to abrade against the air flow. Note how simple the waffle irons are c/w a rocket engine, and they do steering as well. I wonder how feasible the whole scheme would be without them.

Cheers, Mike.

( edit ) So the question becomes for a Mars mission : how much can aero-braking be relied upon ? I think that may vary per Mars season too .....

( edit ) Elon has tickled expectations via a brief twitter : "SpaceX announcement tomorrow at 1pm PST" { in context this will be 1pm PST on 27/02 }

* By that I mean the fins return a greater economy in fuel use over that which is used in carrying them about at all. Even when stowed flat against the hull they are an energy cost in mass to propel and contribute some amount of drag in any atmospheric flight phase. Every design choice has a benefit/cost aspect to consider.

I have made this letter longer than usual because I lack the time to make it shorter ...

... and my other CPU is a Ryzen 5950X :-) Blaise Pascal

Mike Hewson
Mike Hewson
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Wow : SpaceX to send two

Wow : SpaceX to send two people around the Moon and back !

Quote:

We are excited to announce that SpaceX has been approached to fly two private citizens on a trip around the moon late next year. They have already paid a significant deposit to do a moon mission. Like the Apollo astronauts before them, these individuals will travel into space carrying the hopes and dreams of all humankind, driven by the universal human spirit of exploration. We expect to conduct health and fitness tests, as well as begin initial training later this year. Other flight teams have also expressed strong interest and we expect more to follow. Additional information will be released about the flight teams, contingent upon their approval and confirmation of the health and fitness test results.

Most importantly, we would like to thank NASA, without whom this would not be possible. NASA’s Commercial Crew Program, which provided most of the funding for Dragon 2 development, is a key enabler for this mission. In addition, this will make use of the Falcon Heavy rocket, which was developed with internal SpaceX funding. Falcon Heavy is due to launch its first test flight this summer and, once successful, will be the most powerful vehicle to reach orbit after the Saturn V moon rocket. At 5 million pounds of liftoff thrust, Falcon Heavy is two-thirds the thrust of Saturn V and more than double the thrust of the next largest launch vehicle currently flying.

Later this year, as part of NASA’s Commercial Crew Program, we will launch our Crew Dragon (Dragon Version 2) spacecraft to the International Space Station. This first demonstration mission will be in automatic mode, without people on board. A subsequent mission with crew is expected to fly in the second quarter of 2018. SpaceX is currently contracted to perform an average of four Dragon 2 missions to the ISS per year, three carrying cargo and one carrying crew. By also flying privately crewed missions, which NASA has encouraged, long-term costs to the government decline and more flight reliability history is gained, benefiting both government and private missions.

Once operational Crew Dragon missions are underway for NASA, SpaceX will launch the private mission on a journey to circumnavigate the moon and return to Earth. Lift-off will be from Kennedy Space Center’s historic Pad 39A near Cape Canaveral – the same launch pad used by the Apollo program for its lunar missions. This presents an opportunity for humans to return to deep space for the first time in 45 years and they will travel faster and further into the Solar System than any before them.

Designed from the beginning to carry humans, the Dragon spacecraft already has a long flight heritage. These missions will build upon that heritage, extending it to deep space mission operations, an important milestone as we work towards our ultimate goal of transporting humans to Mars.

I'm speechless .... :-))

Cheers, Mike.

I have made this letter longer than usual because I lack the time to make it shorter ...

... and my other CPU is a Ryzen 5950X :-) Blaise Pascal

Anonymous

Interesting.  Just a few days

Interesting.  Just a few days ago Boeing announced a revamped timeline for manned space flight.  Now this with SpaceX.  The competitive timeline has kicked in. 

[EDIT] What is Blue Origin up to?  They have or are building a facility at the cape.  They have fallen quiet as of late.  

Mike Hewson
Mike Hewson
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Yeah, the industry has lit up

Yeah, the industry has lit up to SpaceX's competence as demonstrated .....

This sounds like a free-return figure of 8 path, just like Apollo 8 in fact. That, believe it or not, is the easiest bit. With precise aim & timing Newton will give you that for nothing. So the hard parts, as usual, are ascent and re-entry. It would depend upon a high/absolute degree of automation* if no professional astronaut is included. Watch that space ! :-)

Cheers, Mike.

* If it was me up there - I wish - the control panel buttons would have yellow sticky notes on them saying "DON'T EVER TOUCH THIS !". Of course there would be a catering unit to play with.

I have made this letter longer than usual because I lack the time to make it shorter ...

... and my other CPU is a Ryzen 5950X :-) Blaise Pascal

Gary Charpentier
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robl wrote:[EDIT] What is

robl wrote:
[EDIT] What is Blue Origin up to?  They have or are building a facility at the cape.  They have fallen quiet as of late.  

I think they want to sell the Alan Shepard experience.  Up and down in a few minutes, not even a once around.

Virgin Galactic seems to be selling the X-15 experience, Fly a parabola and land a bit downrange.

 

Mike Hewson
Mike Hewson
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On re-read I note : "SpaceX

On re-read I note : "SpaceX has been approached" ie. was propositioned to do this. So maybe two really rich people have looked at the field of possible providers and chose one ? BO and VG are a good magnitude down on the minimum energetics here, and as indicated don't show alot of progress by comparison. Plus "Other flight teams have also expressed strong interest". Hence a cadre of like-minded individuals out there .... I reckon there would be some degree of "faith in Elon" operating here too. He does inspire.

On the danger side it would be worth mentioning that :

- the CRS-7 Dragon did survive an epic blow up high, in all likelihood would have made it to water intact if activated.

- even the Amos-6 kerfoof would have given enough time for a Dragon pad jettison.

Cheers, Mike.

( edit ) @Gary : sadly I reckon an X-15 would give a better X-15 experience than Virgin here !

I have made this letter longer than usual because I lack the time to make it shorter ...

... and my other CPU is a Ryzen 5950X :-) Blaise Pascal

Mike Hewson
Mike Hewson
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I found from SpaceX a graphic

I found from SpaceX a graphic of the proposed Moon mission version of Dragon ( hey! A Moon Dragon ! ) :

spacex_moon_dragon.jpg

where the rear of the craft is a 'service module', currently where the unpressurised trunk is.

Cheers, Mike.

( edit ) I gotta stop reading article comments : alot of "One pundit once said that ...." floaters. So just like a cesspool you 'go through the motions' ...... maybe spending too much time online accelerates Entropy Of The Brain. :-))

I have made this letter longer than usual because I lack the time to make it shorter ...

... and my other CPU is a Ryzen 5950X :-) Blaise Pascal

AgentB
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ESA Sentinel-2B launch In

ESA Sentinel-2B launch

In about 1 hour 45 minutes

 

Mike Hewson
Mike Hewson
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I have a new design that Elon

I have a new design that Elon might like :

fireball.jpg

... I've been doing secret testing in Chum Creek for the last few years. Looks promising .... only 1:100 scale however .... got a newt to LEO the other day ..... gosh wasn't it pleased! Couldn't shut the bloody thing up afterwards ..... something about a 1x4x9 black slab ....

Cheers, Mike.

I have made this letter longer than usual because I lack the time to make it shorter ...

... and my other CPU is a Ryzen 5950X :-) Blaise Pascal

Chris S
Chris S
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Ah, Jerry Anderson's Fireball

Ah, Jerry Anderson's Fireball XL5, the stuff of boyhood memories.

got a newt to LEO the other day ..... gosh wasn't it pleased! Couldn't shut the bloody thing up afterwards ..... something about a 1x4x9 black slab ....

Ah, Clarke's monoliths. Oh yes they are out there! The 1:4:9 dimensions are of course 1²:2²:3² but we humans prefer to use Golden ratio of 1:1.61 as more aesthetic.

Waiting for Godot & salvation :-)

Why do doctors have to practice?
You'd think they'd have got it right by now

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