What is the white spray-pattern residue inside these Falcon Heavy nozzles?What are these 'Lego' plates inside the Atlas 5 fairing?Why are exhaust flames “jumping around” the bases of the Falcon-9 engine nozzles; NROL-76?Do they assemble the Falcon Heavy on the TEL?What are these yellow devices attached to the Falcon Heavy?What is this object on the Falcon Heavy payload stream?Why the soot pattern on the nosecone of Falcon Heavy side booster?What are these tiles inside the Falcon 9 fairing?Why are these Falcon 9 1st stage bodies (apparently) wrapped in black plastic for transport?What are these flames on the Falcon 9 booster?What are these big shiny metallic “lumps” on the bottom edge of each Falcon Heavy nozzle?
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What is the white spray-pattern residue inside these Falcon Heavy nozzles?
What are these 'Lego' plates inside the Atlas 5 fairing?Why are exhaust flames “jumping around” the bases of the Falcon-9 engine nozzles; NROL-76?Do they assemble the Falcon Heavy on the TEL?What are these yellow devices attached to the Falcon Heavy?What is this object on the Falcon Heavy payload stream?Why the soot pattern on the nosecone of Falcon Heavy side booster?What are these tiles inside the Falcon 9 fairing?Why are these Falcon 9 1st stage bodies (apparently) wrapped in black plastic for transport?What are these flames on the Falcon 9 booster?What are these big shiny metallic “lumps” on the bottom edge of each Falcon Heavy nozzle?
$begingroup$
What is the white residue in a spray pattern seen on the inside of each nozzle of each side core of this Falcon Heavy image from the Teslarati article SpaceX reveals Falcon Heavy Block 5 in first official photo, timelapse. See also SpaceX tweet.
I'm thinking it could be related to engine shut-down, but it looks like they are assembling a Falcon Heavy for launch, so wouldn't the nozzles have at least been cleaned after the previous launch?
spacex falcon-heavy identify-this-object nozzle merlin-1d
asked Apr 8 at 0:43
uhohuhoh
41.7k19160524
$endgroup$
add a comment |
$begingroup$
What is the white residue in a spray pattern seen on the inside of each nozzle of each side core of this Falcon Heavy image from the Teslarati article SpaceX reveals Falcon Heavy Block 5 in first official photo, timelapse. See also SpaceX tweet.
I'm thinking it could be related to engine shut-down, but it looks like they are assembling a Falcon Heavy for launch, so wouldn't the nozzles have at least been cleaned after the previous launch?
spacex falcon-heavy identify-this-object nozzle merlin-1d
asked Apr 8 at 0:43
uhohuhoh
41.7k19160524
$endgroup$
$begingroup$
Looks like they need those little spike strips that keep pigeons from roosting! Very, very large space-pigeons.
$endgroup$
– Avi Cherry
Apr 8 at 18:49
add a comment |
$begingroup$
What is the white residue in a spray pattern seen on the inside of each nozzle of each side core of this Falcon Heavy image from the Teslarati article SpaceX reveals Falcon Heavy Block 5 in first official photo, timelapse. See also SpaceX tweet.
I'm thinking it could be related to engine shut-down, but it looks like they are assembling a Falcon Heavy for launch, so wouldn't the nozzles have at least been cleaned after the previous launch?
spacex falcon-heavy identify-this-object nozzle merlin-1d
asked Apr 8 at 0:43
uhohuhoh
41.7k19160524
$endgroup$
What is the white residue in a spray pattern seen on the inside of each nozzle of each side core of this Falcon Heavy image from the Teslarati article SpaceX reveals Falcon Heavy Block 5 in first official photo, timelapse. See also SpaceX tweet.
I'm thinking it could be related to engine shut-down, but it looks like they are assembling a Falcon Heavy for launch, so wouldn't the nozzles have at least been cleaned after the previous launch?
spacex falcon-heavy identify-this-object nozzle merlin-1d
spacex falcon-heavy identify-this-object nozzle merlin-1d
asked Apr 8 at 0:43
uhohuhoh
41.7k19160524
asked Apr 8 at 0:43
uhohuhoh
41.7k19160524
edited Apr 8 at 1:31
uhoh
asked Apr 8 at 0:43
uhohuhoh
41.7k19160524
asked Apr 8 at 0:43
uhohuhoh
41.7k19160524
asked Apr 8 at 0:43
uhohuhoh
41.7k19160524
41.7k19160524
$begingroup$
Looks like they need those little spike strips that keep pigeons from roosting! Very, very large space-pigeons.
$endgroup$
– Avi Cherry
Apr 8 at 18:49
add a comment |
$begingroup$
Looks like they need those little spike strips that keep pigeons from roosting! Very, very large space-pigeons.
$endgroup$
– Avi Cherry
Apr 8 at 18:49
$begingroup$
Looks like they need those little spike strips that keep pigeons from roosting! Very, very large space-pigeons.
$endgroup$
– Avi Cherry
Apr 8 at 18:49
$begingroup$
Looks like they need those little spike strips that keep pigeons from roosting! Very, very large space-pigeons.
$endgroup$
– Avi Cherry
Apr 8 at 18:49
add a comment |
1 Answer
1
active
oldest
votes
$begingroup$
I believe it is residue from the TEA-TEB starting fluid.
Triethylaluminum combustion produces aluminum oxides, Triethylborane produces boron oxides. Both are shades of white and grey, matching the streaks. Each engine is tested on the stand at McGregor before installation in a booster, and again in the full booster checkout, so there are several opportunities to deposit the waste, even on a new booster.
They have expressed a goal of zero refurbishment before a typical reflight, which seems to include unnecessary cleaning. They likely have enough data on engine reuse to understand the rate it builds up at, and when it may become a problem.
answered Apr 8 at 2:36
SaibooguSaiboogu
4,3142231
$endgroup$
1
$begingroup$
This makes sense (towards zero refurbishment); and the oxides may be quite refractory. I'd wonder if the local change in emissivity could cause temperature gradients and therefore extra stress, but I assume that's been considered.
$endgroup$
– uhoh
Apr 8 at 2:44
1
$begingroup$
@uhoh The high volume of cold RP-1 flowing through the bell walls may also help reduce the strength of any temperature gradients.
$endgroup$
– Saiboogu
Apr 12 at 16:46
1
$begingroup$
I realize that what's going through my mind is images of the long, glowing red-hot 2nd stage nozzles we see in the launch videos. But these are the short, atmospheric 1st stage nozzles and they run a lot cooler than I was imagining.
$endgroup$
– uhoh
Apr 12 at 22:58
add a comment |
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1 Answer
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$begingroup$
I believe it is residue from the TEA-TEB starting fluid.
Triethylaluminum combustion produces aluminum oxides, Triethylborane produces boron oxides. Both are shades of white and grey, matching the streaks. Each engine is tested on the stand at McGregor before installation in a booster, and again in the full booster checkout, so there are several opportunities to deposit the waste, even on a new booster.
They have expressed a goal of zero refurbishment before a typical reflight, which seems to include unnecessary cleaning. They likely have enough data on engine reuse to understand the rate it builds up at, and when it may become a problem.
answered Apr 8 at 2:36
SaibooguSaiboogu
4,3142231
$endgroup$
1
$begingroup$
This makes sense (towards zero refurbishment); and the oxides may be quite refractory. I'd wonder if the local change in emissivity could cause temperature gradients and therefore extra stress, but I assume that's been considered.
$endgroup$
– uhoh
Apr 8 at 2:44
1
$begingroup$
@uhoh The high volume of cold RP-1 flowing through the bell walls may also help reduce the strength of any temperature gradients.
$endgroup$
– Saiboogu
Apr 12 at 16:46
1
$begingroup$
I realize that what's going through my mind is images of the long, glowing red-hot 2nd stage nozzles we see in the launch videos. But these are the short, atmospheric 1st stage nozzles and they run a lot cooler than I was imagining.
$endgroup$
– uhoh
Apr 12 at 22:58
add a comment |
$begingroup$
I believe it is residue from the TEA-TEB starting fluid.
Triethylaluminum combustion produces aluminum oxides, Triethylborane produces boron oxides. Both are shades of white and grey, matching the streaks. Each engine is tested on the stand at McGregor before installation in a booster, and again in the full booster checkout, so there are several opportunities to deposit the waste, even on a new booster.
They have expressed a goal of zero refurbishment before a typical reflight, which seems to include unnecessary cleaning. They likely have enough data on engine reuse to understand the rate it builds up at, and when it may become a problem.
answered Apr 8 at 2:36
SaibooguSaiboogu
4,3142231
$endgroup$
1
$begingroup$
This makes sense (towards zero refurbishment); and the oxides may be quite refractory. I'd wonder if the local change in emissivity could cause temperature gradients and therefore extra stress, but I assume that's been considered.
$endgroup$
– uhoh
Apr 8 at 2:44
1
$begingroup$
@uhoh The high volume of cold RP-1 flowing through the bell walls may also help reduce the strength of any temperature gradients.
$endgroup$
– Saiboogu
Apr 12 at 16:46
1
$begingroup$
I realize that what's going through my mind is images of the long, glowing red-hot 2nd stage nozzles we see in the launch videos. But these are the short, atmospheric 1st stage nozzles and they run a lot cooler than I was imagining.
$endgroup$
– uhoh
Apr 12 at 22:58
add a comment |
$begingroup$
I believe it is residue from the TEA-TEB starting fluid.
Triethylaluminum combustion produces aluminum oxides, Triethylborane produces boron oxides. Both are shades of white and grey, matching the streaks. Each engine is tested on the stand at McGregor before installation in a booster, and again in the full booster checkout, so there are several opportunities to deposit the waste, even on a new booster.
They have expressed a goal of zero refurbishment before a typical reflight, which seems to include unnecessary cleaning. They likely have enough data on engine reuse to understand the rate it builds up at, and when it may become a problem.
answered Apr 8 at 2:36
SaibooguSaiboogu
4,3142231
$endgroup$
I believe it is residue from the TEA-TEB starting fluid.
Triethylaluminum combustion produces aluminum oxides, Triethylborane produces boron oxides. Both are shades of white and grey, matching the streaks. Each engine is tested on the stand at McGregor before installation in a booster, and again in the full booster checkout, so there are several opportunities to deposit the waste, even on a new booster.
They have expressed a goal of zero refurbishment before a typical reflight, which seems to include unnecessary cleaning. They likely have enough data on engine reuse to understand the rate it builds up at, and when it may become a problem.
answered Apr 8 at 2:36
SaibooguSaiboogu
4,3142231
answered Apr 8 at 2:36
SaibooguSaiboogu
4,3142231
answered Apr 8 at 2:36
SaibooguSaiboogu
4,3142231
answered Apr 8 at 2:36
SaibooguSaiboogu
4,3142231
4,3142231
1
$begingroup$
This makes sense (towards zero refurbishment); and the oxides may be quite refractory. I'd wonder if the local change in emissivity could cause temperature gradients and therefore extra stress, but I assume that's been considered.
$endgroup$
– uhoh
Apr 8 at 2:44
1
$begingroup$
@uhoh The high volume of cold RP-1 flowing through the bell walls may also help reduce the strength of any temperature gradients.
$endgroup$
– Saiboogu
Apr 12 at 16:46
1
$begingroup$
I realize that what's going through my mind is images of the long, glowing red-hot 2nd stage nozzles we see in the launch videos. But these are the short, atmospheric 1st stage nozzles and they run a lot cooler than I was imagining.
$endgroup$
– uhoh
Apr 12 at 22:58
add a comment |
1
$begingroup$
This makes sense (towards zero refurbishment); and the oxides may be quite refractory. I'd wonder if the local change in emissivity could cause temperature gradients and therefore extra stress, but I assume that's been considered.
$endgroup$
– uhoh
Apr 8 at 2:44
1
$begingroup$
@uhoh The high volume of cold RP-1 flowing through the bell walls may also help reduce the strength of any temperature gradients.
$endgroup$
– Saiboogu
Apr 12 at 16:46
1
$begingroup$
I realize that what's going through my mind is images of the long, glowing red-hot 2nd stage nozzles we see in the launch videos. But these are the short, atmospheric 1st stage nozzles and they run a lot cooler than I was imagining.
$endgroup$
– uhoh
Apr 12 at 22:58
1
1
$begingroup$
This makes sense (towards zero refurbishment); and the oxides may be quite refractory. I'd wonder if the local change in emissivity could cause temperature gradients and therefore extra stress, but I assume that's been considered.
$endgroup$
– uhoh
Apr 8 at 2:44
$begingroup$
This makes sense (towards zero refurbishment); and the oxides may be quite refractory. I'd wonder if the local change in emissivity could cause temperature gradients and therefore extra stress, but I assume that's been considered.
$endgroup$
– uhoh
Apr 8 at 2:44
1
1
$begingroup$
@uhoh The high volume of cold RP-1 flowing through the bell walls may also help reduce the strength of any temperature gradients.
$endgroup$
– Saiboogu
Apr 12 at 16:46
$begingroup$
@uhoh The high volume of cold RP-1 flowing through the bell walls may also help reduce the strength of any temperature gradients.
$endgroup$
– Saiboogu
Apr 12 at 16:46
1
1
$begingroup$
I realize that what's going through my mind is images of the long, glowing red-hot 2nd stage nozzles we see in the launch videos. But these are the short, atmospheric 1st stage nozzles and they run a lot cooler than I was imagining.
$endgroup$
– uhoh
Apr 12 at 22:58
$begingroup$
I realize that what's going through my mind is images of the long, glowing red-hot 2nd stage nozzles we see in the launch videos. But these are the short, atmospheric 1st stage nozzles and they run a lot cooler than I was imagining.
$endgroup$
– uhoh
Apr 12 at 22:58
add a comment |
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Looks like they need those little spike strips that keep pigeons from roosting! Very, very large space-pigeons.
$endgroup$
– Avi Cherry
Apr 8 at 18:49