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Review #2 of "How To Start A Rocket Engine" (Patreon)

Published:
2023-03-06 20:59:06
Imported:
2023-03

Content

I need your help reviewing "How To Start A Rocket Engine" again! This is hopefully the final version. We made some pretty major changes, added a ton more animations, re-voiced over quite a bit of stuff. At this point, we're mostly just looking for miss-spellings or render glitches. Yes, voice over isn't perfect, but it's good enough. And too late to change dialogue in general, unless there's a glaring factual flaw. Thank you so much for your help!- https://f.io/2PDnhXDU

Files

Frame.io

Comments

Anonymous

Thank you Tim for providing us the opportunity to provide our 2 cents worth into the production. You have mentioned cavitation several times in your videos, have you ever provided a description of the problem and what it actually does to the impeller? If not, it might be an idea for a short video, or provide a link to something on it for viewers to learn additionally on their own..

Anonymous

TimeCode 01:30 - STEP BY STEP 02:04 - FUEL RICH PREBURNER 23:36 - OXYGEN PRE-BURNER 33:23 - RE-PRESURIZATION 38:26 - STEP BY STEP 39:46 - Rearranged and simplified for ease of understanding 39:46 - PRE-BURNED 45:04 - PRE-BURNER Not a big deal, but writing consistency can be practiced more in general. "Pre-Burner" and "Preburner" can be considered correct, depending on the context and style guide. If you follow a style guide that favors hyphenation to separate compound words, then "Pre-Burner" would be the preferred spelling. On the other hand, if you are following a style guide that favors closed compounds (where two words are combined into one without a space or hyphen), then "Preburner" would be the preferred spelling. Ultimately, the important thing is to be consistent within a given document or publication. _____________________________________________________________ TimeCode - 03:36 The text is not legible on the "SPACE SHUTTLE SRB FORWARD SEGMENT IGNITER)" graph. And there is too much black around the image. This may not be possible, but bringing the image closer may make the text legible. _____________________________________________________________ TimeCode - 12:40 Your lips do not sync with the audio. _____________________________________________________________ I don't recommend you use dissolve between IGNITION and your face. The IGNITION is not smoothly ending, and it affects the face. _____________________________________________________________ I don't know if this is a frame.io problem. But occasionally, the video pauses while the audio continues to play at normal speed. _____________________________________________________________ Thank you, and I love working with your company as an editor and Motion Designer. I have already filled out the job application through Patreon. Thanks again for all you do, Tim. Best Beezhan Tulu 310-739-2630 arasharcher@icloud.com FullSelfDrive365.com @fsdat365 Demo for documentaries: https://www.fullselfdrive365.com/film-trailers Demo for Tesla Commercials: https://www.fullselfdrive365.com/tesla-commercials Demo for Motion Design 2023: https://www.fullselfdrive365.com/motion-design

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Pet peeve of many English teachers: saying "<i>utilize</i>" when "<i>use</i>" would do.

Anonymous

Awesome video!

Anonymous

I was surprised when you noted that nitrogen could not be used as pre-coolant for the pre-burner for oxygen. From using cold-traps I thought to know that oxygen becomes liquid before nitrogen boils off. So I checked the boiling points of the two: oxygen = - 183 degC, nitrogen = - 196 degC. The melting points are the other way around: oxygen = -219 degC, nitrogen = -210 degC. While it is possible that 15 degrees Celcius is not enough margin for the specific conditions of a rocket engine, it should generally be possible to cool an oxygen pre-burner with nitrogen because the boiling point applies for this process (rather than the melting point).

Anonymous

I really liked this! I've been learning about some of this in school so it's perfect timing for me, lol. Great job!

Anonymous

Another brilliant piece of work, Tim; I really enjoyed learning this much more about the inner workings of rocket engines!! One of these was that solid fuel boosters are lit along the whole length of the centre line of the booster and burn inside-out, rather than from the flamy end to the top as fireworks would. This obviously generates a lot more propulsion.

Anonymous

The fact that, as you say, the spin-up process is running open-loop for the first few seconds is in my view pretty crazy - but necessary, as you are explaining in your piece (great graphics - love those!). So much so that I wonder if RS-25 or Raptor are indeed suitable for up- and down- operation in orbital flights. There are so many changes in conditions upon re-entry, and engines have to be turned off at times to save fuel, which means that they would require a pretty insanely complex predictor for engine settings that works at any height. For the upcoming tests it is obviously not necessary to have that since SpaceX may have an idea of the height they may need to start the engines during descent, so only few different height-settings are required. And they will no doubt learn more as boosters and starships actually conduct those maneuvers. But what would they do if during a descent with people on board a firing of the engines was necessary where they don't usually have one? Think of Apllo 13.

Conleth Byrne

Had to watch many videos so still unfinished. However so far so brilliantly done. A whole new perspective on engines. Highly recommended 👌