Just throwing in a quick note: Pad B is NOT clear, so no static fire testing from S24 today.
Why were there no frost/condensation lines on the booster for it's firing yesterday?
So the word has been that all the outer engines startup using GSE-supplied fluids. However, obviously there has to be a transition to vehicle-supplied propellants pretty darn quick as the vehicle lifts off.
Quote from: Herb Schaltegger on 08/11/2022 08:42 pmSo the word has been that all the outer engines startup using GSE-supplied fluids. However, obviously there has to be a transition to vehicle-supplied propellants pretty darn quick as the vehicle lifts off.It's possible that I'm lost, but "GSE-supplied fluids" to me means nitrogen, helium (whatever) for spin-up and other start neads but they always run on vehicle-supplied propellants.
How many Raptors are they firing in these recent static fires of B7? Looks like a single engine?
So the word has been that all the outer engines startup using GSE-supplied fluids. However, obviously there has to be a transition to vehicle-supplied propellants pretty darn quick as the vehicle lifts off. Today's longer 21 second test is interesting because Elon specifically tweeted that it was a test of autogenous pressurization - which means that after startup, it had to transition cleanly to internal tanks, which then maintained internal tank pressure throughout.
Whoa there. The one up there now may not be, and probably isn't, the flight article. "Close" might be a tad bit optimistic.
Today's longer 21 second test is interesting because Elon specifically tweeted that it was a test of autogenous pressurization - which means that after startup, it had to transition cleanly to internal tanks, which then maintained internal tank pressure throughout.
Odd, I would have thought they'd not bother with autogenous feeds from the rim engines, only the center engines, to keep the plumbing simpler
Anyone know why they didn't use the water deluge? At least I didn't see evidence of it.
Quote from: Herb Schaltegger on 08/11/2022 08:42 pmToday's longer 21 second test is interesting because Elon specifically tweeted that it was a test of autogenous pressurization - which means that after startup, it had to transition cleanly to internal tanks, which then maintained internal tank pressure throughout.Odd, I would have thought they'd not bother with autogenous feeds from the rim engines, only the center engines, to keep the plumbing simpler
Quote from: Vettedrmr on 08/11/2022 11:13 pmAnyone know why they didn't use the water deluge? At least I didn't see evidence of it.What they call water deluge is more consistent when compared with other domestic and international launch complexes with launch abort and pad fire suppression system given nozzles have horizontal and diagonally upwards facing high pressure nozzles. Water deluge and sound suppression systems generally use a different design using high flow rate rainbird nozzles (similar concept used in organ pipe slit design) in addition to a high concentration ratio of nozzles. The latter two systems do kot physically appear to be present whereas the fire suppression system seems to have a reasonable number of nozzles present.