Author Topic: SpaceX Raptor engine - General Thread 4  (Read 1634870 times)

Offline FutureSpaceTourist

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Re: SpaceX Raptor engine - General Thread 4
« Reply #3360 on: 01/11/2025 05:36 am »
https://twitter.com/mcrs987/status/1877855892793696589

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Updated and revised SpaceX Raptor 3 schematic
Took a lot of feedback from the previous post and fixed several things. This should now be properly representative to all current knowledge.

As always the fullres diagram is available below 🧵

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Specific updates from the last diagram include;
- revising the oxygen preburner and it's location
- changing the colors of some fluids to be more visibly discernable
- fixing the ch4 autogen flowpath
- updating and fixing spec numbers
- added more labels and iconography to identify smaller features
- added the powerhead regen channels (as far as we know)
- replaced the helium spinstart with nitrogen
- cleaned up some of the intersecting flow paths between the powerhead to become more legible

There is also a few discrepancies that are still not totally known, such as;
- exactly where the ch4 autogen is coming from. it is either the outlet of the methane powerhead autogen, like depicted, traveling through the hot gas manifold, or, it is directly tapped off at the valve assembly on the transfer tube from the lower regen manifold up to the top of the lox powerhead. we do not have any legible photos of that side of the engine unfortunately so it is not able to be exactly determined
- preburner ignitor type. pretty self explanatory, we don't know what exactly the ignitors for the burners are. With the way that this engine operates it is highly doubtful that it uses conventional torch ignitors anymore, however, they still need gox/ch4, via the presence of such inlets on the common umbilical
- number of turbines on each powerhead. via recovered debris it seems likely that there is in-fact two turbines on both powerheads, via the size of the turboshaft coupling, but it is not confirmed.
- where the ch4 powerhead regen starts. It may be directly connected to the chamber regen loop, or it may be tapped off starting at the end of the transfer tube, like depicted. The pressures/temperatures of the methane after exiting the nozzle and chamber regen is not totally known but can be roughly estimated, suggesting that it is still "cool" enough to be used in regenerative cooling. This also doubles back to the previous point of the ch4 autogen

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Re: SpaceX Raptor engine - General Thread 4
« Reply #3361 on: 01/11/2025 05:28 pm »
It is great news to see replaced the helium spinstart with nitrogen on the new 01.08.25 SPACEX RAPTOR 3 ENGINE STATEPOINT DIAGRAM2 from TheSpaceEngineer @mcrs98, quoted directly above in this thread. (I didn't want to repeat the whole post.)

This Helium elimination closes a long chapter. Helium has added complexity and points of failure. For example, Helium tanks and structures have played roles in failures (non-topical in this thread) like the 28 June 2015 launch failure of F9 CRS-7 and the 28 June 2015 Amos-6 launch pad explosion.
I'd rather be here now

Offline Slarty1080

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Re: SpaceX Raptor engine - General Thread 4
« Reply #3362 on: 01/17/2025 12:12 pm »
So the autogenous pressurization gas for Raptor v3 will still be contaminated with H20 and CO2 leaving the requirement to filter out water and dry ices from the liquid oxygen feeds?
My optimistic hope is that it will become cool to really think about things... rather than just doing reactive bullsh*t based on no knowledge (Brian Cox)

Offline dabomb6608

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Re: SpaceX Raptor engine - General Thread 4
« Reply #3363 on: 01/17/2025 09:46 pm »
https://twitter.com/spacex/status/1880332005084471404

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Raptor engines powering liftoff and landing of Super Heavy


I wanted to note something I had never noticed before nor have I seen it mentioned. Technically probably should have put this in the Flight 7 discussion thread but that thread is currently a mess and full of ignorance.

 Anyways, the last photo showing the three center engines lit during the catch you can see how they move the center ring of gimballing raptors out towards the outer ring of engines. Maybe for greater gimbal capabilities of the center three without risk of bell contact?
« Last Edit: 01/17/2025 11:37 pm by dabomb6608 »

Offline FutureSpaceTourist

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Re: SpaceX Raptor engine - General Thread 4
« Reply #3364 on: 01/19/2025 06:33 am »
https://twitter.com/elonmusk/status/1880663737092432217

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33 -> 13 -> 3

It will be very difficult to get Raptor to 300 tons of thrust, but … not impossible

Online ugordan

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Re: SpaceX Raptor engine - General Thread 4
« Reply #3365 on: 01/20/2025 01:54 pm »
I wanted to note something I had never noticed before nor have I seen it mentioned. Technically probably should have put this in the Flight 7 discussion thread but that thread is currently a mess and full of ignorance.

 Anyways, the last photo showing the three center engines lit during the catch you can see how they move the center ring of gimballing raptors out towards the outer ring of engines. Maybe for greater gimbal capabilities of the center three without risk of bell contact?

Don't worry, we got you covered.
https://forum.nasaspaceflight.com/index.php?topic=61945.msg2657450#msg2657450

Offline dabomb6608

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Re: SpaceX Raptor engine - General Thread 4
« Reply #3366 on: 01/21/2025 12:33 pm »
I wanted to note something I had never noticed before nor have I seen it mentioned. Technically probably should have put this in the Flight 7 discussion thread but that thread is currently a mess and full of ignorance.

 Anyways, the last photo showing the three center engines lit during the catch you can see how they move the center ring of gimballing raptors out towards the outer ring of engines. Maybe for greater gimbal capabilities of the center three without risk of bell contact?

Don't worry, we got you covered.
https://forum.nasaspaceflight.com/index.php?topic=61945.msg2657450#msg2657450

Good deal. I try to avoid the discussion thread for a day or so after the launches, keeps my blood pressure down.

Tags: Raptor 3 
 

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