Author Topic: SpaceX: Merlin 1D Updates and Discussion Thread 2  (Read 447192 times)

Offline Robotbeat

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Re: SpaceX: Merlin 1D Updates and Discussion Thread 2
« Reply #80 on: 03/13/2014 07:29 pm »
Merlin 1D may be too large to easily print using a metal 3d printer. I believe they rely on other techniques, like explosive forming.
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Offline Elmar Moelzer

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Re: SpaceX: Merlin 1D Updates and Discussion Thread 2
« Reply #81 on: 03/13/2014 07:48 pm »
Merlin 1D may be too large to easily print using a metal 3d printer. I believe they rely on other techniques, like explosive forming.
Maybe not the large parts, but I could see them print many of the smaller items.

Offline Prober

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Re: SpaceX: Merlin 1D Updates and Discussion Thread 2
« Reply #82 on: 03/13/2014 11:25 pm »
While looking for Merlin data I came across this interesting little chalk talk by Tom Mueller on the Merlin 1C. Have your note pad ready, he gives numbers for the C model. I wonder how much they carry over to the D?

http://www.livescribe.com/cgi-bin/WebObjects/LDApp.woa/wa/MLSOverviewPage?sid=n7SMWV6PdG7r

The article where I found the link is here:

http://blog.linuxacademy.com/space/under-the-hood-with-the-spacex-merlin-engine/

JMO but I expect the numbers carry over reasonably well to the D model, better than the numbers that we don't have on the Merlin D.

You might wish to use the search functions @ the top.   This info has be talked to death ::) ::)
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Offline aero

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Re: SpaceX: Merlin 1D Updates and Discussion Thread 2
« Reply #83 on: 03/14/2014 02:27 am »
Ok, I searched. The article has been linked before but I didn't see anything about the fuel and LOX tank pressures or the turbo pump output pressures. Things I found interesting are:

Tank pressure = 50 psi for both tanks,
turbo pump output pressure, LOX 1400 psi, RP-1 1500 psi
gg combustion temperature 1033 deg. F

Combustion chamber temperature 6000 deg. F
Mdot 350 lbm/s

And the description of how the gas generator works.

Yes, it was for the Merlin 1 C, but interesting anyway.
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Offline Prober

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Re: SpaceX: Merlin 1D Updates and Discussion Thread 2
« Reply #84 on: 03/14/2014 03:12 am »
Ok, I searched. The article has been linked before but I didn't see anything about the fuel and LOX tank pressures or the turbo pump output pressures. Things I found interesting are:

Tank pressure = 50 psi for both tanks,
turbo pump output pressure, LOX 1400 psi, RP-1 1500 psi
gg combustion temperature 1033 deg. F

Combustion chamber temperature 6000 deg. F
Mdot 350 lbm/s

And the description of how the gas generator works.

Yes, it was for the Merlin 1 C, but interesting anyway.

a lot of very good information built up on this site, glad it worked for you.
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Offline cambrianera

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Re: SpaceX: Merlin 1D Updates and Discussion Thread 2
« Reply #85 on: 03/15/2014 08:59 am »
What about an expander cycle Mvac with LOX-CH4 propellants?
Some experience for injector and combustion with CH4 and some kg gained on payload.
Not something I would suggest otherwise, but SpaceX's drive for improved propulsion is out of ordinary.

Removed typo (thanks! :) )
« Last Edit: 03/17/2014 10:54 am by cambrianera »
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Offline aero

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Re: SpaceX: Merlin 1D Updates and Discussion Thread 2
« Reply #86 on: 03/17/2014 05:25 am »
Does anyone (or  everyone but me) know what the area ratio is for the Merlin 1 D Vac engine. That is the upper stage engine?
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Offline cambrianera

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Re: SpaceX: Merlin 1D Updates and Discussion Thread 2
« Reply #87 on: 03/17/2014 12:50 pm »
Does anyone (or  everyone but me) know what the area ratio is for the Merlin 1 D Vac engine. That is the upper stage engine?

Found 117 for Mvac C.
http://forum.nasaspaceflight.com/index.php?topic=29476.msg959740#msg959740
http://forum.nasaspaceflight.com/index.php?topic=26388.msg959792#msg959792
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Offline drsnooker

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Re: SpaceX: Merlin 1D Updates and Discussion Thread 2
« Reply #88 on: 03/18/2014 12:43 am »
I did not see this posted here. I apologize if I missed it somewhere, but it's taken by Steve J last thursday

http://www.flickr.com/photos/jurvetson/13160622333/in/photostream/

Offline sublimemarsupial

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Re: SpaceX: Merlin 1D Updates and Discussion Thread 2
« Reply #89 on: 03/18/2014 12:53 am »
I did not see this posted here. I apologize if I missed it somewhere, but it's taken by Steve J last thursday

http://www.flickr.com/photos/jurvetson/13160622333/in/photostream/

It should go in the MVacC thread, not this one, seeing as how its not an M1D (or even an MVacD). Its not really even an MVacC, its more like a franken-merlin, since it has the MVacC chamber, nozzle, sump, and extension, but the M1C gas generator exhaust system.

Offline docmordrid

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Re: SpaceX: Merlin 1D Updates and Discussion Thread 2
« Reply #90 on: 03/18/2014 12:55 am »
I did not see this posted here. I apologize if I missed it somewhere, but it's taken by Steve J last thursday

http://www.flickr.com/photos/jurvetson/13160622333/in/photostream/

Merlin Blaster? Is someone being cute or is this a new variant for Falcon Heavy? Maybe the improved M1D with 100% thrust?
DM

Offline drsnooker

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Re: SpaceX: Merlin 1D Updates and Discussion Thread 2
« Reply #91 on: 03/18/2014 12:56 am »
I couldn't place it (all chromed up and everything) but his caption is one of 28 engines in the falcon heavy...

Offline go4mars

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Re: SpaceX: Merlin 1D Updates and Discussion Thread 2
« Reply #92 on: 03/18/2014 01:53 am »
What are the things in the background (under and to the right)?
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Offline dorkmo

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Re: SpaceX: Merlin 1D Updates and Discussion Thread 2
« Reply #93 on: 03/18/2014 02:31 am »
What are the things in the background (under and to the right)?

my guess is some sort of bent piping and wiring inventory holder waiting to be installed in the octoweb?

Offline Lars_J

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Re: SpaceX: Merlin 1D Updates and Discussion Thread 2
« Reply #94 on: 03/18/2014 02:35 am »
What are the things in the background (under and to the right)?

I'm no expert, but
 - just below is an "octaweb" assembly station,
 - and just to the right of that they appear to be assembling and/or doing electrical tests on M1D engines (three are lined up)

Offline JBF

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Re: SpaceX: Merlin 1D Updates and Discussion Thread 2
« Reply #95 on: 03/18/2014 11:30 am »
It's a display they have hanging up.  I want to say it's a 1A due to the thrust structure and GG exhaust, but I could be wrong.
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Offline sublimemarsupial

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Re: SpaceX: Merlin 1D Updates and Discussion Thread 2
« Reply #96 on: 03/18/2014 02:16 pm »
It's a display they have hanging up.  I want to say it's a 1A due to the thrust structure and GG exhaust, but I could be wrong.

Its not a 1A. Its up there purely to look pretty - its an MVacC thrust structure, chamber, nozzle, and nozzle extension with M1C (ie boost phase) gas generator and exhaust, likely just made up of spares they no longer have a use for other than decoration.

Offline corrodedNut

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Re: SpaceX: Merlin 1D Updates and Discussion Thread 2
« Reply #97 on: 03/18/2014 02:27 pm »
It's a display they have hanging up.  I want to say it's a 1A due to the thrust structure and GG exhaust, but I could be wrong.

Its not a 1A. Its up there purely to look pretty - its an MVacC thrust structure, chamber, nozzle, and nozzle extension with M1C (ie boost phase) gas generator and exhaust, likely just made up of spares they no longer have a use for other than decoration.

I agree. It's a Franken-merlin.

Offline aero

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Re: SpaceX: Merlin 1D Updates and Discussion Thread 2
« Reply #98 on: 03/30/2014 09:27 pm »
I ran my Falcon 9 launch simulation with throttle up on the 1 D Vac only. It puts 13,150 kg into a 185 km orbit  when throttled up from 106% to 110% giving 21 kg to 160 kg prop reserve.  Below that throttle setting all the prop is used and then some, but very little more than is available. At 100 % throttle the burn goes to 389 seconds where my program stops on prop limits, 154 kg beyond a full prop load, and 3 m/s short of orbit, though it is 250 meters above the 185 km orbital altitude.

This is with prop reserved  for first stage recovery, with stage 1 entering the stratopause at 1.07 km/s.

This says to me that the advertised numbers of 13,150 kg to orbit with stage 1 recovery is doable.
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Offline mr. mark

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Re: SpaceX: Merlin 1D Updates and Discussion Thread 2
« Reply #99 on: 04/21/2014 04:43 pm »
4 successful launches so far. That 36 engines Merlin 1D (non Vacuum) all running nominally with no failures. Far better than the Merlin 1C. Looks like they've got it right this time.

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