SpaceX reusable rockets

Brane22 je 11. okt 2017 ob 02:21 izjavil:

Koneckoncev cockney genialec nima drugega kot YT kanal, oziroma vsaj ni znan po drugem, MUsk pa ima tri zelo vidne firme.

Khm... Coulomb explosion during the early stagesof the reaction of alkali metals with water

Ne. To je ta, ki dela z vakuumskimi cevmi in pozna vakuum; njegova celotna predpostavka pa je, da so varne vakuumske cevi predrage. Sicer to pove zelo baročno, ampak to je to. Ne trdi, da se ne da, ampak da je varna izvedba nepraktična in predraga in da ni trga, ki bi to plačeval - IOW, da je, če bo zadeva varna, hkrati tudi nerentabilna. Tako kot je nerentabilen Concorde.

Zgradit high-speed-rail, ki bi dosegal do 600 km/h je sigurno ceneje kot zgradit varno vakuumsko cev. Ker nihče ne rabi bit tako nujno v 30 minutah iz SF v LA, da bo teh 30 minut čepel v klavstrofobični konzervi, ko pa gre lahko na letalo in precej udobneje opravi to pot v 2 urah (z vstopnimi in izstopnimi procedurami vred), hkrati pa celo lahko opravi kako delo na laptopu. Ali pa se pelje s 600 km/h na maglev vlaku, pa isto pot opravi v cca 2x daljšem času kot v vakuumski cevi, v neudobni konzervi.

imagodei je 11. okt 2017 ob 13:54 izjavil:

Brane22 je 11. okt 2017 ob 02:21 izjavil:

Koneckoncev cockney genialec nima drugega kot YT kanal, oziroma vsaj ni znan po drugem, MUsk pa ima tri zelo vidne firme.

Khm... Coulomb explosion during the early stagesof the reaction of alkali metals with water

Wow. Pozabu sem. Ob enem igranju s high-speed kamero se mu/jim je nekaj usralo zadosti dobro, da so objavili papir na neko levo temo.

My bad. I take it back.

Me zanima, če bo tole kdaj aktualno...

https://www.reactionengines.co.uk/

Raketni motor, ki jemlje oksidator (kisik) iz zraka...

Jap, nimajo pravega blefiranja tipa Elon Musk .

Zahojeni Britanci s še bolj butasto vlado in investitorji...

Nikec3 je 11. okt 2017 ob 18:33 izjavil:

Earth to Earth z raketo, ki je narejena za Mars je zagotovo popoln bullshit. To je nekaj podobnega bi z avtomobilom poskusil priti v Ameriko.

Saj ne bo za tebe in podobne, vsaj ne še kmalu. Ampak 20 min potovalnega časa z raketo na drugo polovico je tudi precej vredno za nekatere.

Mislim, da ne bo težav najti potnike, pa naj se zdi še tako nesmiselno za nekatere v ekonomskem smilslu.

Dajte mal pospeške in pojemke poračunat pri takem podvigu ... meni to ne izgleda nekaj, kamor bi vtaknil enga zavaljenga bogatuna. No, mogoče če si želi umreti in style ...

Eh, ti pospeški so manj od 3G. Drobiž...

So sateliti bolj občutljivi na njih kot ljudje...

https://www.quora.com/How-many-Gs-of-ac...

Verjetno zato, ker lahko.
(močan motor, prazna raketa)

Gledal ravnokar tale video od Scott Manley in se mi je zdelo zanimivo. Mislite da bi bila možna helikopterska autorotacija iz vesolja na ta način? Ali bi samo blejde zlomilo takoj pri vstopu v atsmosfero? Namesto padal autorotacija

Kaj se varnosti tiče tudi če slučajno raznese kako raketo to sploh ne pomeni, da bo kaj problemov glede kapsule. Dodatni testi so zasnovan da v primeru take nesreče preživi posadka ter dragoon V2, boeingov CST 100, Orion morajo uspešno prestat razne teste, ki simulirajo podobne pogoje, preden bodo prevažali posadko. Do sedaj so na dobri poti.

Dragon V1 je res razneslo v zraku, vendar to je dobro. Kapsula je preživela na začetku, edino problem je bil, da se niso pravočasno odprla padala, to pa so zarad napake popravil ter se nekaj naučil.

Metan je cenejši, čisto verjetno je, da bodo ljudje plačal za prevoz med celinami z raketo, mogoče bo šla raketa dovolj visoko ter se bo zarad tega splačal ter bodo to tržil.

Tudi z Dragoonom 2 bi se lahko služilo z vesoljskim turizmom (poleg Moon tripa) ter Musk ima to v mislih, zato tudi hoče dezajn z "oknom" ter fancy oblekami. 7 Sedežev bo, ljudje bodo plačal, da bi šli v vesolje okrog Zemlje. Cenej ko bo, več jih bo hotl it ter SpaceX jih bo lahko peljal dosti višje kot "pocen" Virgin Galactic.

Sicer se pa z znižanjem cene vesoljskih poletov odpira veliko možnosti. Veliko lažje bo za razne misije ter tudi privatne vesoljske postaje, ki so v razvoju ter Bigelow tudi testira na ISS.

Čestitke Musku za innovativnost ter pogum le tko naprej!

Ce kdo ni gledal vceraj (oz danes zgodaj zjutraj) se splaca pogledat pristanek zlo crispy boosterja. :)

tolk daleč smo že, da se vam ne da niti linka na posnetek prlimat?
nič posebnega TM ...

Interesting items from Gwynne Shotwell's talk at Stanford tonight
vir Sticklefront


The introductory talk itself consisted largely of showing various SpaceX YouTube videos we have all seen before. She nonetheless included a few details here of interest:

On Falcon Heavy

Reaffirmed that the rocket is ready and they are just waiting on the launchpad

Confirmed plan to launch in December (this is not just an Elon-date)

On launch sites

Pad 39a will be used for Falcon Heavy launches and crew flights

Boca Chica launch site under construction is the "perfect location for BFR"

She did not mention anything else about Boca Chica other than its prime suitability for BFR

On Commercial Crew

Reaffirmed timetable for launching crew next year

Extremely proud of Launch Escape System

First manned flight will have two astronauts on board

On "Global Broadband Network"

"Does anybody like their cable company? [Laughs] No one!"

Dragon is a very sophisticated satellite, so in that light, sees internet constellation as a natural extension of their current work

Compared size of global launch market (~8 billion dollars/year) to broadband market (~1 trillion dollars/year) to further explain SpaceX's interest

On Mars

Perhaps it was just an awkward phrase, but used the term "propellant depot" to describe orbital refueling process for BFR

Talked about tanker BFR and mentioned how Elon wants the fuel transfer to actually be as fast as seen in the Adelaide animation

At this point, it became a Q&A session. Audience members submitted questions online and voted on other questions. Steve Jurvetson sat down on stage with Shotwell and selected top voted questions and skillfully modified them as necessary to make them more sensible. This is perhaps the best SpaceX Q&A I have seen, this format is worth emulating.

Does SpaceX have the resources to do the satellite constellation and the BFR together, or will they need to prioritize?

We can do it, no question. We can fund both developments, depending on the time frame you're talking about. But Elon is impatient to get to Mars, so we'll have to get a bit creative with the financing.

How far can SpaceX take reuse?

The second stage is not designed for reuse on the Falcon 9 or the Falcon Heavy. However, we do want to bring it back slowly. Currently, it reenters but too hot. On missions with extra propellant, we want to bring it back to see how it behaves, not to recover or reuse. This data will be very valuable.
Fairings have been recovered. We expect recovery will be good enough to start regularly reusing them in the first six months of next year.

Can normal people tolerate the g-forces of point-to-point BFR flight?

We are designing it so normal people can fly in it. We'll take care regarding the g-limit, but the experience will undoubtedly be sportier than an airplane.

Will SpaceX work with other companies regarding infrastructure on the surface of Mars?

SpaceX is focused on the transportation part of the Mars problem, but people need somewhere to go once they arrive. I don't think it's an accident that Elon started the Boring Company, tunnels will be very important in the first steps of living on Mars, before we build domes and terraform. We want other companies to start thinking about it and working on it, but we'll do it if we have to. I think the BFR might be ready before these other components of actually living on Mars.

Moon base vs Mars?

The moon is to some extent a practice to go to Mars, but given how government programs are, it'll take decades to even get to the moon. If the goal is Mars, then let's not waste resources going to the moon. But a real lunar base would be interesting, that's worth fighting for. Our ship will go to the moon, I'm sure we'll be part of the program that does go to the moon, but it will be designed for Mars.

What is the biggest obstacle to the BFR's success?

The composite tanks will be challenge, but we are doing it already. We are currently building a larger raptor right now, and currently have a scaled version of raptor on the test stands. Harder than the rocket, though, will be where poeple are going to live, what will life be like, what will they do there? Also, while the choice of fuel for the BFR was constrained by resource availability on Mars, it is no accident that the final choice of methane is the cheapest energy source here on earth. This will greatly facilitate the economics side of things.

How many BFR failures does SpaceX expect in development, and how many can it withstand?

I'm sure we'll have failures in the development program. However, as far as the launching piece, I'm going to say none (knocks on wood). Also, [referencing Mark Twain anecdote] we've learned so much from previous development programs, and have already hit all the sandbars, so I'm confident in our ability to design it properly.

Where will the BFR be built?

We're looking at building a facility by the water in LA. We thought we'd build it in our factory in Hawthorne, but we priced transport to the harbor, and it came out to $2.5m per trip. It would require taking down stoplights, and just wouldn't be worth it. So we will build a new facility by the water. We will eventually also have a number of production sites by out launch sites.

What is it like having been a part of SpaceX since the beginning? Both in terms of being this successful, and being able to stay on mission?

I wasn't sure we would make it when I joined SpaceX, but I knew I wouldn't want to be part of this industry if SpaceX didn't make it. I had a lot of experience in the industry before joining SpaceX and was sad at the lack of innovation in the industry. I was very disillusioned and decided to quit industry entirely and perhaps become a hairdresser if SpaceX didn't work out. Government money was being spent in stupid ways, and I wanted to show how to spend money on an exciting way, and it happened to be in space. The first time we went to the ISS, I didn't think we'd make it. If one more sensor had failed we'd have had to abort. But that success, and our first landing success, made it all worth it. Just being a part of that... When you watch the video of the Orbcomm landing, you can feel the energy that went up, the way everyone cheered... That's just not something they do on Wall Street.

vostok_1 je 12. okt 2017 ob 13:15 izjavil:

I smell chicken cooking.
Kaj je bilo to?

GTO --> speed --> chicken

To se vedn zgovarjajo na izgubo signala. Enkrat se spomnem jim je raznesl booster ob pristanku pa se je vse vidl live, od takrat so pa te "izgube" signala. Pol ko pa vidjo, da je vse vredu, pa je spet signal. Če bi blo kj narobe pa nebi nić dobil videa ter nebi bil ognjemet pokazan.

Sicer pa čestitke, da so spet ponovno uporabili 1 fazo ter jo pristali. Počas bo čas, da isti booster pošljejo v zrak tretjič.

Paul30 je 12. okt 2017 ob 21:07 izjavil:

To se vedn zgovarjajo na izgubo signala. Enkrat se spomnem jim je raznesl booster ob pristanku pa se je vse vidl live, od takrat so pa te "izgube" signala. Pol ko pa vidjo, da je vse vredu, pa je spet signal. Če bi blo kj narobe pa nebi nić dobil videa ter nebi bil ognjemet pokazan.

Sicer pa čestitke, da so spet ponovno uporabili 1 fazo ter jo pristali. Počas bo čas, da isti booster pošljejo v zrak tretjič.

lol Paul30, kako si se pa ti tole zdle gladko izmislil :D
Mendela effect ali samo #fakenews? :)

Kaj se zgodi ob 5.30 ha, nekam zamrzne vse haha, nič več prenosa tik ob pristanku

Drug pristanek.



Okol 8.47 spet mrk, pol na konc prikažejo ko je vsega konec,..

Več se mi jih pa ne de dat gor, dima tud ni toliko enako svetloba tud ni tko močna.

Gledali smo ze live pristanek direktno iz boosterja in hkrati posnetek iz letala pa ne samo enkrat.

A se ti res zdi, da karkoli skrivajo? :D

Evo, padala se za kapsulo niso dobra. ;)

http://spacenews.com/soyuz-capsule-suff...

Letos Aprila je prislo do izgube tlaka v Soyuz kapsuli, ker je del sistema za parachute deployment butnil ob kapsulo.

Simulacija delovanja raketnega motorja:

Najbolj zanimivo v članku je, kako poskuša ULA izničiti znanje in dosežke Blue Origin.

Očitno so te private funded firme dovolj dobre, da so postale huda konkurenca.

Če bo komercializacija vesolja postala realnost, to dejansko tudi pomeni ba bo vsaka država lahko kaj gor poslala.
Dobr, vesoljske smeti so en problem, kaj pa vojaške tehnologije?

Sicer ZDA prepoveduje ameriškim firmam izvajati polete, ki bi ogrozili nacionalno varnost, ampak takim firmam bolj malo brani, da se preselijo v kako drugi državo in tam ponujat prevoze.
Orbitalne assassinacije itd.
Scary shit.

Hja težko boš kakega pomembneža v temni ulici dobil. Manjši kos železa z terminalno hitrostjo pa naredi kar konkretno škodo + plausible deniability.

Wat?