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SpaceX General Section / Re: BFR and the space industry
« Last post by guckyfan on Today at 10:35 AM »
Quote from: envy887
And you are assuming that SpaceX cannot profit sufficiently from downmass.

Yup.  I've seen nothing even close to a business case.  Anything involving people or even tonne-quantity downmass can use a Dragon (whatever rev is current at that time).

Elon said more downmass will be useful for point to point on earth. Makes a lot of sense to me.
2
ISS Section / Re: US EVA 46 - October 20, 2017
« Last post by centaurinasa on Today at 10:32 AM »
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ISS Section / Re: US EVA 46 - October 20, 2017
« Last post by centaurinasa on Today at 10:31 AM »
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SpaceX General Section / Re: BFS is an SSTO?
« Last post by guckyfan on Today at 10:30 AM »
Elon said they can fire the vac engines at SL.

> The "vacuum" or high area ratio Raptors can operate at full thrust at sea level. Not recommended.

I am assuming they can for a test, but not operationally.
5
SpaceX General Section / BFS is an SSTO?
« Last post by IainMcClatchie on Today at 10:25 AM »
The BFS has three medium-expansion Raptors with 1700 kN thrust each, and is 1250 tonnes fully fuelled with no payload.  It's thrust-to-weight ratio on the pad is 4.1 m/s^2.

If we reduce the propellant load from 1100 tonnes to 307 tonnes we can get the liftoff TWR to 13 m/s^2, which is more usual for sea level liftoff.  But now the stage delta-V is around 5400 m/s.

Seems like BFS is not even close to an SSTO unless they replace all the vacuum engines with sea-level engines.
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ISS Section / Re: US EVA 46 - October 20, 2017
« Last post by centaurinasa on Today at 10:24 AM »
Ready for MetOx canisters changeout
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Space Science Coverage / Re: NASA - Dawn updates and discussion
« Last post by as58 on Today at 10:22 AM »
Have they said what the 'other target' would have been this time?
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ISS Section / Re: US EVA 46 - October 20, 2017
« Last post by centaurinasa on Today at 10:21 AM »
Final cycle of exercises...
9
I don't think they can send deluge water through miles of pipe, so they would need a tower on the launch platform also.

So are they planning some type of saltwater deluge system?

Or is the offshore BFR launch platform Elon showed in the presentation just notional?
10
Space Science Coverage / Re: NASA - Dawn updates and discussion
« Last post by Star One on Today at 10:15 AM »
Dawn Mission Extended at Ceres:
https://www.jpl.nasa.gov/news/news.php?feature=6980

For a second time they’ve been blocked from moving it on to another target.
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