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#1460
by
Jim
on 25 Jan, 2018 13:47
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Saturn V didn't have a sound suppression water deluge
Edited.
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#1461
by
Star One
on 25 Jan, 2018 13:56
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Saturn V didn't have a water deluge
Not to go off topic but why was that?
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#1462
by
stcks
on 25 Jan, 2018 13:57
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#1463
by
Hankelow8
on 25 Jan, 2018 14:01
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Saturn V didn't have a water deluge
Yes it did, in the photo (of me) standing in the flame trench, you can see two pipes protruding into the trench, they pumped water to each side of the rocket thrust deflector.
Although not a clear photo you can see water cascading down the launch tower just after the Saturn V had left the pad.
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#1464
by
.Scott
on 25 Jan, 2018 14:05
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Here is a shot of the Falcon 9 with the Merlin engines.
There's less fire and you can seen hints of Mach diamonds.
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#1465
by
Jim
on 25 Jan, 2018 14:08
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1. Yes it did, in the photo (of me) standing in the flame trench, you can see two pipes protruding into the trench, they pumped water to each side of the rocket thrust deflector.
2. Although not a clear photo you can see water cascading down the launch tower just after the Saturn V had left the pad.
1. That was for cooling the deflector and not a "deluge"
2. That came on after lift off
The Saturn V did not have a water sound suppression deluge like the shuttle or FH. It was only for deflector cooling and firex after launch. It was a much less volume.
The firex and surface cooling water came on after liftoff. See here
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#1466
by
CeeJayDugan
on 25 Jan, 2018 14:09
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#1467
by
ugordan
on 25 Jan, 2018 14:16
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Here is a shot of the Falcon 9 with the Merlin engines.
There's less fire and you can seen hints of Mach diamonds.
What do you mean less fire? F9 literally looks the most like a Saturn V exhaust on account of a large amount of gas generator-driven post combustion, large flames "licking" away long after the brightest part of the plume shortly below the engines. Atlas, Antares, even the new Electron have a different flame where the tail end of the plume is more bluish. Of all the RP-1 rockets, F9 probably has the longest plume, just like Saturn, on account of the same and less efficient engine cycle.
Some shots of Saturn V launches also show hints of Mach diamonds, depending on how the film was processed and what exposure used.
The only reason Saturn produced that much flame was because even if there was water (pre)dumped into the flame trench, it was not in the same quantity as SpaceX uses.
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#1468
by
Hankelow8
on 25 Jan, 2018 14:16
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1. Yes it did, in the photo (of me) standing in the flame trench, you can see two pipes protruding into the trench, they pumped water to each side of the rocket thrust deflector.
2. Although not a clear photo you can see water cascading down the launch tower just after the Saturn V had left the pad.
1. That was for cooling the deflector and not a "deluge"
2. That came on after lift off
The Saturn V did not have a water sound suppression deluge like the shuttle or FH. It was only for deflector cooling and firex after launch. It was a much less volume.
The firex and surface cooling water came on after liftoff. See here
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#1469
by
Rocket Science
on 25 Jan, 2018 14:26
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One word to describe the sound of the staggered ignition to me was the Italian music term "staccato"...
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#1470
by
Craig_VG
on 25 Jan, 2018 14:43
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#1471
by
AC in NC
on 25 Jan, 2018 15:08
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Falcon Heavy = 5,100,000 lbf
Saturn V = 7,891,000 lbf
This Falcon Heavy reportedly only produces about 4,692,000 lbs maximum thrust. That assumes that the engines were running full throttle yesterday.
- Ed Kyle
Can you help me reconcile what you are trying to say?
My understanding was that Musk indicated the 1st Falcon Heavy mission would run at 92%. The stack produces 5.1M but will be throttled down. The 92% is exactly your 4.692M. So I think "this Falcon Heavy" does produce 5.1M but MAY have only produced 4.692M during the test IF it was running at the same 92% throttle Musk indicated for the Demo.
I think your operative point may be accurate in that LC39A didn't necessarily see 5.1M yesterday, but the phrasing may suggest something that isn't necessarily true AFAIK.
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#1472
by
ZachF
on 25 Jan, 2018 15:11
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Falcon Heavy = 5,100,000 lbf
Saturn V = 7,891,000 lbf
Liftoff thrust:
52,700kN BFR
33,850kN Saturn V
29,580kN Shuttle
22,815kN Falcon Heavy
9,411kN Delta IV Heavy
Liftoff power:
85.2GW BFR
43.6GW Saturn V
37.9GW Shuttle
31.5GW Falcon Heavy
16.8GW Delta IV Heavy
A little comparo...
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#1473
by
Rocket Science
on 25 Jan, 2018 15:12
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Saturn V didn't have a water deluge
Yes it did, in the photo (of me) standing in the flame trench, you can see two pipes protruding into the trench, they pumped water to each side of the rocket thrust deflector.
Although not a clear photo you can see water cascading down the launch tower just after the Saturn V had left the pad.
Vintage pics are always great!
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#1474
by
Rocket Science
on 25 Jan, 2018 15:25
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IIRC the rain bird sound suppression system was mainly for potential acoustic damage the the Shuttle's tiles and during Apollo water was mainly for cooling...
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#1475
by
crandles57
on 25 Jan, 2018 15:37
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I would guess this
https://twitter.com/thesheetztweetz/status/955966079066656768Falcon Heavy static fire planned for tomorrow (1/24) at noon ET with a 6 hour window.
KSC source says that SpaceX is targeting February 6 for the launch, if the static fire goes well.
is likely to be more accurate than Musk's "week or so".
Doesn't seem worth catching GovSat booster (1032.2 - early version and used twice) and Hispasat Feb 14 is expendable.
Feb 6th 39A FH
Feb 10 Vandenberg Paz
14th 40 HispaSat
3 launches in 8 days from 3 pads including first flight of FH?
Then gap til another 3 again possibly in 8 days on March 18th, 20th, and 26th. Seem to be getting bunched up into 3s. Just chance I assume, but perhaps gap was deliberate to allow time for FH delays? Or, could there be another launch between Feb 14th and March 18th?
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#1476
by
wannamoonbase
on 25 Jan, 2018 15:38
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9-10 days from the FH first launch, dare I dream?
I'm hopeful that this bird flies twice. It's an expensive piece of hardware why not use it twice.
Also, Hawthorne will be busy with F9 Block 5's. producing a Block 5 FH could eat into their available resources.
The static fire video is very impressive, I loved the size of the steam cloud. I can't wait to see it rise up and get gone.
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#1477
by
Jim
on 25 Jan, 2018 15:38
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IIRC the rain bird sound suppression system was mainly for potential acoustic damage the the Shuttle's tiles and during Apollo water was mainly for cooling...
For Shuttle, it was the payloads
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#1478
by
.Scott
on 25 Jan, 2018 15:52
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What do you mean less fire?
I am referring to the length and volume of the flames below the booster.
This is shown in reply #1462.
The flames lengths are about proportional to the thrust
F 5000KN - about 60 feet long.
SV 35000KN - about 400 feet long.
But the Saturn flames spread out much further. Hence more volume per Newton.
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#1479
by
Lars-J
on 25 Jan, 2018 16:12
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What do you mean less fire?
I am referring to the length and volume of the flames below the booster.
This is shown in reply #1462.
The flames lengths are about proportional to the thrust
F 5000KN - about 60 feet long.
SV 35000KN - about 400 feet long.
But the Saturn flames spread out much further. Hence more volume per Newton.
Those pictures are not comparrable. Different stages of ascent (Saturn V far higher), and also likely different light conditions.
