D4H has less than half the GLOW of Falcon Heavy. LOX/LH2 doesn't make a
great first stage propellant w/o a lot of applied cleverness (a lot more
than Boeing applied for D4/D4H)...
Jon
On Feb 6, 2018 7:02 PM, "Paul Mueller" <paul.mueller.iii@xxxxxxxxx> wrote:
Interesting that the FH is roughly the same size as the Delta IV Heavy,
but it has a much larger payload capacity to LEO. And this is with
lower-specific-impulse engines than the LOX-LH2 engines on the Delta IV
Heavy. Does anyone have the gross liftoff weight of the two rockets for
comparison (Henry S)?
On Tue, Feb 6, 2018 at 5:51 PM, Paul <dmarc-noreply@xxxxxxxxxxxxx> wrote:
On 07/02/2018 00:18, Kenning Lundermann wrote:
The Falcon Heavy launch was certainly very impressive, but I wonder
whether FH itself will ever do much of note. SpaceX itself has dropped its
own plans for the rocket (Dragons to Mars, circular flights with
passengers). If certified, FH could get payloads now flying on Delta 4
Heavy, but that's about one a year. It might get some planetary probes too
demanding for F9 but, again, that's not a lot.
Elon said 2-3 FH launches a year, qualified for National Security
missions in approx 4 years...
Estimated dev cost (self funded) $500M!! so I guess they want to recoup
some of that..
We have heard noises from VP Pence's entourage about a role for FH, which
I presume involves commercial resupply of the so-called Deep Space Gateway.
But aside from that, which may well never happen, is there much concrete
interest in FH among those with the ability to put there money where their
mouths are?
Elon said Spacex focus is now on Crew Dragon and then BFR (9m dia, >100m
tall!!) ...and I think he said SSTO...
On 2/6/18, 21:35 Henry Vanderbilt <hvanderbilt@xxxxxxxxxxxxxx>
<hvanderbilt@xxxxxxxxxxxxxx> wrote:
Your phrasing is ambiguous - have you seen word on the center booster
barge landing yet? All I can find is, result not known yet.
That aside - woo-HOO! An indication of the precision in the booster
recoveries was that thruster firings etc on the two boosters were pretty
much simultaneous throughout. (One did touch down a half-second or so
after the other, mind - but I'm not complaining.)
Seriously, an historic day. 64 mt to LEO, with I guesstimate well over
90% by value (27 of 28 engines) of the overall booster recovereable and
reusable. A major step forward on the path.
Henry
On 2/6/2018 2:17 PM, John Stoffel wrote:
Wow...just wow. Watching the liftoff, max-q, separation, side booster
landings, second stage ignition, etc. All just amazing. Even if they
lost the core stage on landing... wow.
Such an amazingly successful launch, congrats!
<http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient>
Virus-free.
www.avg.com
<http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient>
<#m_2211383681773241476_m_2728605387927348687_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>