Author Topic: Virgin Orbit preparing for busy LauncherOne future  (Read 103138 times)

Online gongora

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Re: Virgin Orbit preparing for busy LauncherOne future
« Reply #220 on: 04/15/2018 01:58 PM »
ALBus is also listed in ELaNa XIX on Electron!

The ELaNa XIX document is much more recent, I'd go with that one where there is differing information.

Online FutureSpaceTourist

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Re: Virgin Orbit preparing for busy LauncherOne future
« Reply #221 on: 04/18/2018 10:14 PM »
Quote
Dan Hart, Virgin Orbit: towards the tail end of qualification for LauncherOne. Did latest engine test 12 hours ago. First launch later this year. #34SS

https://twitter.com/jeff_foust/status/986728853195206656

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Re: Virgin Orbit preparing for busy LauncherOne future
« Reply #222 on: 04/23/2018 10:08 PM »

Online Gliderflyer

Re: Virgin Orbit preparing for busy LauncherOne future
« Reply #223 on: 04/24/2018 01:14 AM »

Be sure to watch it with the subtitles on; they like to add funny comments in there.
I tried it at home

Offline catdlr

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Re: Virgin Orbit preparing for busy LauncherOne future
« Reply #224 on: 04/24/2018 02:46 AM »

Quote
Be sure to watch it with the subtitles on; they like to add funny comments in there.


Love it, that was fun.  Wish NASA Stennis would do this same, even if they were info tidbits.
« Last Edit: 04/24/2018 02:46 AM by catdlr »
Tony De La Rosa

Offline Lars-J

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Re: Virgin Orbit preparing for busy LauncherOne future
« Reply #225 on: 04/24/2018 05:13 AM »


The flame output does not look very stable, it seemed to vary a lot (particular when in side view angle) - is this normal for an engine of this scale, or is this engine missing part of its high altitude or vacuum nozzle?

Offline jongoff

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Re: Virgin Orbit preparing for busy LauncherOne future
« Reply #226 on: 04/24/2018 06:07 AM »

Be sure to watch it with the subtitles on; they like to add funny comments in there.

Thanks for the heads up! Those captions were actually pretty funny. Even being a rocket geek, there's no way I would've watched a full 3.5min firing without having something like that to keep my attention...

:-)

~Jon

Offline john smith 19

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Re: Virgin Orbit preparing for busy LauncherOne future
« Reply #227 on: 04/24/2018 06:41 AM »
The flame output does not look very stable, it seemed to vary a lot (particular when in side view angle) - is this normal for an engine of this scale, or is this engine missing part of its high altitude or vacuum nozzle?
If you watched it with the CC subtitles on you would have known this was including a gimbal test as well.



BFS. The worlds first Methane fueled FFORSC engined CFRP structured A380 sized aerospaceplane tail sitter capable of flying in Earth and Mars atmospheres. BFR. The worlds biggest Methane fueled FFORSC engined CFRP structured booster for BFS. First flight to Mars by end of 2022. Forward looking statements. T&C apply. Believe no one. Run your own numbers. So, you are going to Mars to start a better life? Picture it in your mind. Now say what it is out loud.

Offline Prettz

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Re: Virgin Orbit preparing for busy LauncherOne future
« Reply #228 on: 04/24/2018 12:31 PM »
The flame output does not look very stable, it seemed to vary a lot (particular when in side view angle) - is this normal for an engine of this scale, or is this engine missing part of its high altitude or vacuum nozzle?
If you watched it with the CC subtitles on you would have known this was including a gimbal test as well.
You'll understand if the vast majority of people turned them off, as they go 0 to gag-inducing in 3 seconds.

Online imprezive

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Re: Virgin Orbit preparing for busy LauncherOne future
« Reply #229 on: 04/24/2018 01:40 PM »
The flame output does not look very stable, it seemed to vary a lot (particular when in side view angle) - is this normal for an engine of this scale, or is this engine missing part of its high altitude or vacuum nozzle?
If you watched it with the CC subtitles on you would have known this was including a gimbal test as well.
You'll understand if the vast majority of people turned them off, as they go 0 to gag-inducing in 3 seconds.

I already feel bad for Pomerantz when he reads this. haha

Offline Pomerantz

Re: Virgin Orbit preparing for busy LauncherOne future
« Reply #230 on: 04/24/2018 03:07 PM »
I already feel bad for Pomerantz when he reads this. haha
Eh, the overwhelming majority of people seem to love them. And for those who don't, that's why we made them an Easter Egg that is turned off by default. We never even mention them or promote them in any way, they are just left for people to find on their own, in hopes that perhaps they will feel a little bit of joy when reading them.

And honestly, if I were the only person in the world who found them amusing, I'd probably keep writing them anyway. Cause why not, right?
---------
I post here for fun, but in the interest of full disclosure, I work for Virgin Orbit. That said, I'm an honest fan of pretty much everything space.

Offline Davidthefat

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Re: Virgin Orbit preparing for busy LauncherOne future
« Reply #231 on: 04/24/2018 03:15 PM »


The flame output does not look very stable, it seemed to vary a lot (particular when in side view angle) - is this normal for an engine of this scale, or is this engine missing part of its high altitude or vacuum nozzle?

Looks a bit dirty as well.

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Re: Virgin Orbit preparing for busy LauncherOne future
« Reply #232 on: 04/24/2018 11:26 PM »


The flame output does not look very stable, it seemed to vary a lot (particular when in side view angle) - is this normal for an engine of this scale, or is this engine missing part of its high altitude or vacuum nozzle?

Looks a bit dirty as well.

I don't know if it is normal for engines of this size, but with the large variations in engine construction, O/F ratios, combustion efficiencies, etc., it is hard to define a "normal" look for rocket engines. The plume looks similar to their other hotfire videos on youtube, so I would guess this one is in family and "normal" for it.
I tried it at home

Offline deruch

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Re: Virgin Orbit preparing for busy LauncherOne future
« Reply #233 on: 04/25/2018 07:14 AM »
The flame output does not look very stable, it seemed to vary a lot (particular when in side view angle) - is this normal for an engine of this scale, or is this engine missing part of its high altitude or vacuum nozzle?

Looks a bit dirty as well.

The gas generator exhaust seems to be right below and in-line with the nozzle in this set-up.  So, that might be what you are seeing.  You can see it more clearly in the top video.
Shouldn't reality posts be in "Advanced concepts"?  --Nomadd

Offline Lars-J

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Re: Virgin Orbit preparing for busy LauncherOne future
« Reply #234 on: 04/25/2018 07:52 AM »
The flame output does not look very stable, it seemed to vary a lot (particular when in side view angle) - is this normal for an engine of this scale, or is this engine missing part of its high altitude or vacuum nozzle?

Looks a bit dirty as well.

The gas generator exhaust seems to be right below and in-line with the nozzle in this set-up.  So, that might be what you are seeing.  You can see it more clearly in the top video.

No, that's not what I mean. Look at the exhaust starting at 1:00, top view. The brightness of the exhaust flickers on and off like a hybrid or solid, not like a smooth running liquid engine usually does. But I could be wrong... The VG guys know a lot more about rockets than I do!  :)

I have attached a tiny GIF I made from the video.

Offline john smith 19

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Re: Virgin Orbit preparing for busy LauncherOne future
« Reply #235 on: 04/25/2018 08:35 AM »
Eh, the overwhelming majority of people seem to love them. And for those who don't, that's why we made them an Easter Egg that is turned off by default. We never even mention them or promote them in any way, they are just left for people to find on their own, in hopes that perhaps they will feel a little bit of joy when reading them.

And honestly, if I were the only person in the world who found them amusing, I'd probably keep writing them anyway. Cause why not, right?
Not to mention the side benefit of causing competitors to underestimate your engine achievements.  :).
BFS. The worlds first Methane fueled FFORSC engined CFRP structured A380 sized aerospaceplane tail sitter capable of flying in Earth and Mars atmospheres. BFR. The worlds biggest Methane fueled FFORSC engined CFRP structured booster for BFS. First flight to Mars by end of 2022. Forward looking statements. T&C apply. Believe no one. Run your own numbers. So, you are going to Mars to start a better life? Picture it in your mind. Now say what it is out loud.

Offline edzieba

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Re: Virgin Orbit preparing for busy LauncherOne future
« Reply #236 on: 04/25/2018 11:05 AM »
The flame output does not look very stable, it seemed to vary a lot (particular when in side view angle) - is this normal for an engine of this scale, or is this engine missing part of its high altitude or vacuum nozzle?

Looks a bit dirty as well.

The gas generator exhaust seems to be right below and in-line with the nozzle in this set-up.  So, that might be what you are seeing.  You can see it more clearly in the top video.

No, that's not what I mean. Look at the exhaust starting at 1:00, top view. The brightness of the exhaust flickers on and off like a hybrid or solid, not like a smooth running liquid engine usually does. But I could be wrong... The VG guys know a lot more about rockets than I do!  :)

I have attached a tiny GIF I made from the video.
That could just as well be a camera artefact as anything else, the image is already wobbling all over the place like an overexited jelly due to the rolling shutter effect.

Offline Senex

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Re: Virgin Orbit preparing for busy LauncherOne future
« Reply #237 on: 04/25/2018 12:50 PM »
I already feel bad for Pomerantz when he reads this. haha
Eh, the overwhelming majority of people seem to love them. And for those who don't, that's why we made them an Easter Egg that is turned off by default. We never even mention them or promote them in any way, they are just left for people to find on their own, in hopes that perhaps they will feel a little bit of joy when reading them.

And honestly, if I were the only person in the world who found them amusing, I'd probably keep writing them anyway. Cause why not, right?

Whether or not I always agree with what Virgin does, I appreciate Mr. Pomerantz sharing the occasional note with us.  He is contributing more to our collective progress than I am able to, and I thank him for that.

All the best, Will.  Please keep posting.

Offline Kabloona

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Re: Virgin Orbit preparing for busy LauncherOne future
« Reply #238 on: 04/25/2018 01:52 PM »

The flame output does not look very stable, it seemed to vary a lot (particular when in side view angle) - is this normal for an engine of this scale, or is this engine missing part of its high altitude or vacuum nozzle?

I had the same reaction, that it looked more like a hybrid plume. From the side view (aft looking forward) there are dark streaks in the plume at the exit plane, typical of unburned hydorcarbons, similar to their hybrid motor firings.

Maybe they are doing something funky with the injector pattern, like injecting excess RP-1 around the perimter to help cool the nozzle, resulting in poor mixing in the chamber and more afterburning in the plume?
« Last Edit: 04/25/2018 01:56 PM by Kabloona »

Offline Pomerantz

Re: Virgin Orbit preparing for busy LauncherOne future
« Reply #239 on: 04/26/2018 12:41 AM »
Whether or not I always agree with what Virgin does, I appreciate Mr. Pomerantz sharing the occasional note with us.  He is contributing more to our collective progress than I am able to, and I thank him for that.

All the best, Will.  Please keep posting.

Aw, thanks! I've lurked here for a long time, and am happy to contribute to the conversation here.

In response to some of the other questions and comments raised: almost all of the issues mentioned are indeed camera artifacts, as edzieba and others have guessed. (We're basically using traffic cameras for these particular footage.) The rest are pretty much attributable to the fact that we were not using the flight nozzle in this particular test.
---------
I post here for fun, but in the interest of full disclosure, I work for Virgin Orbit. That said, I'm an honest fan of pretty much everything space.

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