Author Topic: Tim Dodd Elon interview at BC Spring 2022  (Read 65161 times)

Online FutureSpaceTourist

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Re: Tim Dodd Elon interview at BC Spring 2022
« Reply #160 on: 07/09/2022 03:10 pm »
[posted here for completeness, but suggest raptor discussion goes on the existing raptor thread:
https://forum.nasaspaceflight.com/index.php?topic=53555.0]



Quote
Elon Musk Explains SpaceX's Raptor Engine!

Today we’re getting up close and personal with SpaceX’s Raptor 2 engine with Elon Musk. We get into all sorts of details on this engine including how exactly it’s been upgraded and simplified compared to Raptor 1.

This video has a ton of fun details on some fairly technical stuff, so be sure and watch my "Why don’t rocket engines melt" video - - so you know what we’re talking about with some of the cooling techniques as well as my video on engine cycles - - so you understand how the Raptor’s full flow staged combustion cycle works and why it’s advantageous!

00:00 - Intro
00:50 - Conversation Starts
02:00 - Raptor 1 vs Raptor 2
03:50 - Thrust and Chamber Pressure
05:30 - Iteration Philosophy
06:30 - Melting Engines and Cooling
09:30 - Torch Igniters and Starting
13:00 - Full Flow Advantages
15:30 - Swirl Injectors
16:40 - Thrust Vector Control
20:30 - Simplifications
24:50 - Removing Throat Film Cooling
25:35 - Boost Pumps and Impellers
30:35 - Inline Powerhead Discussion
32:15 - Fluorine, Dual Cooling and Aerospikes
35:00 - Chamber Pressure and Impulse
40:00 - Outro
« Last Edit: 07/09/2022 03:20 pm by FutureSpaceTourist »

Offline sanman

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Re: Tim Dodd Elon interview at BC Spring 2022
« Reply #161 on: 07/09/2022 09:38 pm »
[posted here for completeness, but suggest raptor discussion goes on the existing raptor thread:
https://forum.nasaspaceflight.com/index.php?topic=53555.0]



00:00 - Intro
00:50 - Conversation Starts
02:00 - Raptor 1 vs Raptor 2
03:50 - Thrust and Chamber Pressure
05:30 - Iteration Philosophy
06:30 - Melting Engines and Cooling
09:30 - Torch Igniters and Starting
13:00 - Full Flow Advantages
15:30 - Swirl Injectors
16:40 - Thrust Vector Control
20:30 - Simplifications
24:50 - Removing Throat Film Cooling
25:35 - Boost Pumps and Impellers
30:35 - Inline Powerhead Discussion
32:15 - Fluorine, Dual Cooling and Aerospikes
35:00 - Chamber Pressure and Impulse
40:00 - Outro



@39:00 - "LOX Transfer Tube" - is that like a downcomer that connects LOX header tank in nose to main LOX tank lower down? How did it collapse?
« Last Edit: 07/09/2022 09:38 pm by sanman »

Offline Dancing Dog

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Re: Tim Dodd Elon interview at BC Spring 2022
« Reply #162 on: 07/10/2022 01:49 am »
Speculation is that a GSE sequence error or valve failure cause the tube to depressurize while the surrounding "header" tank was at higher pressure. They cut the collapsed tube section into pieces and removed it, then replaced it by welding sheet steel, in place, into a new tube section. It's since undergone multiple cycles of cryotesting without further incident.

Edit: This is in the Booster; the LOX "header" tank is actually on the thrust puck and the methane transfer tube runs through it.
« Last Edit: 07/10/2022 02:14 am by Dancing Dog »

Offline ctillier

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Re: Tim Dodd Elon interview at BC Spring 2022
« Reply #163 on: 07/10/2022 02:44 am »
Around 38:00 it’s amusing to hear two really smart people grasp for the name of something that is a well established physical concept, called “impulse”

 

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