Author Topic: Elon Musk IAC Mars Speech - Sept. 27, 2016 - DISCUSSION THREAD (Read 447128 times)

Seer · « **Reply #200 on:** 09/27/2016 07:50 pm »

The first stage has a dry mass percentage of 4%. Pretty sporty.

Welsh Dragon · « **Reply #201 on:** 09/27/2016 07:51 pm »

Size matters.

jimbowman · « **Reply #202 on:** 09/27/2016 07:54 pm »

Now that is interesting.

rakaydos · « **Reply #203 on:** 09/27/2016 07:54 pm »

Quote from: rst on 09/27/2016 07:48 pm

Quote from: Cherokee43v6 on 09/27/2016 07:43 pm
Quote from: Star One on 09/27/2016 07:39 pm
What happens if the booster and/ or tanker has an issue are all those colonists left twiddling their collective thumbs in orbit.

Smart move is to reverse the launch order. The fuel doesn't get quite so impatient as the passengers.

Obviously works for one refueling run -- but Musk said mission profiles could involve several (IIRC, up to five).

He also said the fleet could involve as many as 1000 BFS liner, launched and fueled over a 2 year period. That's a long time to wait for the tide to come in. Probably, the crew doesnt board till shortly before departure, which means the liner can wait just as long as the tankers.

Space Ghost 1962 · « **Reply #204 on:** 09/27/2016 07:58 pm »

ITS is a logical extension of RD and propulsive landing.

What distinguishes SX from BO is the focus on landing on solar system bodies.

S.Paulissen · « **Reply #205 on:** 09/27/2016 07:59 pm »

OMG, that is not just a burp to see transients. There was definitely steady state firing time in there.

jimbowman · « **Reply #206 on:** 09/27/2016 08:00 pm »

Welsh Dragon · « **Reply #207 on:** 09/27/2016 08:01 pm »

They've already build a full scale tank!

Usili · « **Reply #208 on:** 09/27/2016 08:01 pm »

Quote from: S.Paulissen on 09/27/2016 07:59 pm

OMG, that is not just a burp to see transients. There was definitely steady state firing time in there.

If you don't mind me asking, what do you mean by transients?

matthewkantar · « **Reply #209 on:** 09/27/2016 08:01 pm »

Tank built !!!!

Lars-J · « **Reply #210 on:** 09/27/2016 08:02 pm »

Quote from: matthewkantar on 09/27/2016 08:01 pm

Tank built !!!!

Biggest surprise (IMO) yet!

matthewkantar · « **Reply #211 on:** 09/27/2016 08:02 pm »

Quote from: Usili on 09/27/2016 08:01 pm

Quote from: S.Paulissen on 09/27/2016 07:59 pm
OMG, that is not just a burp to see transients. There was definitely steady state firing time in there.

If you don't mind me asking, what do you mean by transients?

Unevenness or burping in start up and shut downs.

Edited for bad spelling.

vandersons · « **Reply #212 on:** 09/27/2016 08:03 pm »

Oh my, that's a whopper of a tank! And all made entirely out of carbon fibre.

matthewkantar · « **Reply #213 on:** 09/27/2016 08:05 pm »

Quote from: vandersons on 09/27/2016 08:03 pm

Oh my, that's a whopper of a tank! And all made entirely out of carbon fibre.

And out of sight as well.

Matthew

ZachF · « **Reply #214 on:** 09/27/2016 08:09 pm »

Second question-asker...

S.Paulissen · « **Reply #215 on:** 09/27/2016 08:10 pm »

Guy might still be high from Burning Man asks an idiotic question. Elon handled him well.

Hotblack Desiato · « **Reply #216 on:** 09/27/2016 08:10 pm »

First question (helodriver, I suppose): great thing, regarding production of ITS and problems with road transportation.

Great answer too.

Second question: hey I was at burning man and there was a lot of sh*t, and it was a dry desert... It could have been an interesting question about ECLSS, which is a real topic... but just that?

jimbowman · « **Reply #217 on:** 09/27/2016 08:10 pm »

Quote from: ZachF on 09/27/2016 08:09 pm

Second question-asker...

Didn't seem like someone who attends Burning Man.

hrissan · « **Reply #218 on:** 09/27/2016 08:10 pm »

Quote from: Kaputnik on 09/27/2016 07:46 pm

Quote from: vanoord on 09/27/2016 07:26 pm
Looks like COPVs immersed in those tanks

Carbon fibre tanks?!

Autogenous pressurisation, so I don't think COPVs are needed.

Those spheres probably hold oxygen and methane @ high pressure for bipropellant CH4/O2 thrusters... So they might be considered a kind of COPVs...

There even might be an electric pump replenishing the pressure from main tanks...

Kaputnik · « **Reply #219 on:** 09/27/2016 08:12 pm »

Question about surface systems, radiation, and habitats.

Point rear of rocket at sun to act as radiation shield. On Mars, dose immediately halved by planet. Artifical magentic field is potential solution eventually.

Radiation risk is over blown.