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3D Printed Hybrid Rocket Motor

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Voting period is over. Please don't add any new votes. Voting period ends on 30 Dec 2016 at 19:31:32 (UTC)

Original – 3D printed hybrid rocket motor, featuring dual helical ports and a transparent nozzle.
Reason
High quality, really helps the article. Some minor cleanup on it would be nice, but I lack the skills. Transparent motors are not common. I do not believe any other motor exists where the motor is transparent from the injector to the nozzle exit plane, making it a very good candidate.
Articles in which this image appears
Hybrid rocket
FP category for this image
Wikipedia:Featured pictures/Space/Getting there
Creator
Matt Steiner and Kees08
I made the rocket motor. We fired it. The demonstration is the rocket motor firing. I can provide any details you would like about it. We used nitrous oxide as the oxidizer and pyrodex pellets for the igniter. This specific fuel grain was used for the hot fire. Kees08 (talk) 08:12, 18 December 2016 (UTC)[reply]
Don't worry. Janke likes to make a few uninformed opposes now and then. Just a little bad habit. lNeverCry 08:51, 18 December 2016 (UTC)[reply]
"Uninformed"? That's a bit unfair. "The demonstration is the rocket motor firing" is not mentioned in the article, as far as I can see. Furthermore, a scale (or at least a mention) to indicate the size would be important - it looks very small, but is it? For this reason I find the EV low, in a general article about hybrid motors. With some more context, I would not have opposed. --Janke | Talk 11:07, 18 December 2016 (UTC)[reply]
It is all good! I can try to write up the description on the photo better. it is very small, about a 6" long motor (I'll double check our drawings). Kees08 (talk) 17:24, 18 December 2016 (UTC)[reply]
  • Oppose – EV. There is little about this image in the article, including in its image caption – no mention of helices, transparency of the fuel grain and the device casing, depiction of nozzle, operation in combustion phase, demonstrative value of the image/project. Perhaps a paragraph in the Universities section can add context. Sidenote about copyright: the image shows a university project, captured presumably at a university setting. Does the university own the copyright? (funding issues, private setting, etc.) Bammesk (talk) 14:05, 18 December 2016 (UTC)[reply]
  • Oppose – EV. There is no mention of this rocket in the article, I'm not sure why it is even on the page actually. Mattximus (talk) 14:07, 18 December 2016 (UTC)[reply]
  • Comment: @Janke, Bammesk, and Mattximus: I was procrastinating on writing the hybrid rocket engine article because it is a pretty daunting task. Seems like a good time to get moving on it; I will write a motor grain manufacturing methods section and it should help out that section quite a bit. I'll ping you when I am finished. Bammesk: The professor paid for it out of pocket and two of us worked on it without funding. I'll try to tag up with the professor to verify. If there are other things that would cause an oppose, let me know while I address those. Kees08 (talk) 17:24, 18 December 2016 (UTC)[reply]
    • Kees08, adding context definitely improves the article, and evaporates my oppose! but it doesn't guarantee support. Bammesk (talk) 00:29, 19 December 2016 (UTC)[reply]
      • @Janke, Bammesk, and Mattximus: I have written a small section on manufacturing of fuel grains and placed the photo there. I do believe it now provides EV, but please let me know if you disagree. I might try to expand that section more, but not surprisingly, it can be difficult to find good sources on hybrid rocket fuel grain manufacturing. Kees08 (talk) 05:28, 20 December 2016 (UTC)[reply]
        • @Kees08: I suggest a more detailed image caption such as: Transparent 3D-printed hybrid rocket fuel grain, a developmental sample operating in combustion phase (or, a developmental sample shown post-burn, if that's the case), with integrated exit nozzle and helical channels. Also in the file description [1], this wording is confusing: "The grain pictured here is the combustion chamber". What does it mean? "grain is chamber"! For my info: as photographed, is there a transparent encapsulation around the fuel grain? Bammesk (talk) 02:37, 21 December 2016 (UTC)[reply]
          • @Bammesk: I'll work on the caption and description tonight. For the sake of the discussion, what is really neat here is that the fuel grain acts as the combustion chamber! I have some high speed videos of it, but the one video that was actually good I forgot to plug the camera into the wall, so the video was lost while downloading... Either way, I'll write up a bit more now. Kees08 (talk) 03:00, 21 December 2016 (UTC)[reply]
            • @Kees08 and Godot13: Good caption. Adding a 1-inch scale to the image would be an improvement (it is not for scientific use so it doesn't have to be accurate, a ballpark scale for encyclopedic use). If you are Ok with that perhaps Godot13 can add it. You said it is about 6 inches long, did you mean end to end? Bammesk (talk) 01:22, 22 December 2016 (UTC)[reply]
              • @Bammesk and Godot13: I am fine with that, if Godot13 can do it. The motor was six inches long; I cannot find the drawing for it, but we have a rendered model with a ruler next to it. Six inches long end to end. Godot13, would you have time to do that? If not, I'll give it a go. Kees08 (talk) 05:41, 22 December 2016 (UTC)[reply]
                • @Kees08: I added a 1 inch scale. Hopefully the "grain manufacturing" section will have more content later on, for now there seems to be enough EV, and clarity about the image and device size. Support. Bammesk (talk) 02:59, 27 December 2016 (UTC)[reply]
                  • Thank you. It will be expanded, I have been neglecting some GA review duties so have been hitting that up. I decided that article needed rewritten from the top down, and have been working through it. I'll discuss different additive manufacturing materials for that section, reasons that you would do that in another section, and whatever else I can. I have two hybrid rockets under my belt, finally time to share the lessons I have learned! (without doing OR, hopefully obviously!) Kees08 (talk) 03:51, 27 December 2016 (UTC)[reply]

Promoted File:3D Printed Hybrid Rocket Fuel Grain.jpg --Armbrust The Homunculus 21:50, 30 December 2016 (UTC)[reply]

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