Mario Hernandez

New amateur turbopump just dropped 😎

me waiting for the tax season to start

@kegrocket hell yeah

Extremely successful cryo/tanking test for KegRocket. Next Stop: Static Fire

they're called "systems engineers" because nobody trusts them with anything more dangerous than a screenshot of a CAD model of the actual hardware

As spoken by someone who has never touched Excel

there’s a special kind of pain when your simulation mesh takes four hours to generate and the solver fails on the first iteration because one element has negative jacobian somewhere in a fillet you didn’t even care about

@sbarky38 Common sbarky W

Welcome new followers! I mainly create drawings of cute rockets, satellites, and spacecraft. Please make yourself comfy!

me and the boys on the way to the Company's moon to turn in this week's loot (we didn't meet the quota)

@blind_via Frieren.

I haven't made time for watching anime in a long time. I need the Japanese recommendations for the best anime to watch that came out in the last decade

Mapping continues to be one of the most improvable areas with modern software and data analytics tools. Insane work!

@JulianFried Man I wish I could take this opportunity. Next time I'm in LA I'll hit you up. Thanks for doing this!

Marco’s in here burning wire on a Sunday

@ryanpappano @servomechanica Huge. Looking forward to the tests!

Turbopump update! 90% of the parts are done, and the test stand is coming along. The turbine outlet duct finished machining marking the last large part to be made. Side quests included a dynamic balancing machine, and finally getting my custom ADC working.

@nocdns @interaction Got it for free lol

Hell yeah @interaction

@emm0sh I'm not certain that the local compressive force near the bolted joints translates into a globally significant shear frictional transfer. Evidently depends on the number of bolted joints, but I don't know how many that is to avoid meaningful "delamination"

i always found it frustrating in composite beam design that, when calculating shear flow, the bolted joints don’t grant some extra “oomph” through the friction generated between the layers warning: this doesn’t apply to screws or adhesive, just bolts it could be negligible, but, i could also imagine a world in which the net friction force resisting longitudinal shear is greater than the resistive shear of the bolts themselves thinking through the extremes: if you had lubricated beams (µ ~= 0) with high preload, you still have non-composite action but if you had a µ of 1 in Ff = Nµ with that preload, the bolts would see zero shear! what does this mean? if the bolted joint is slip critical, then your composite beam acts compositely why is this useful? well, most of the time you wouldn’t rely on this design mechanism. but if you’re in a pinch and need a little extra safety factor, i could see a version of this analysis getting you there if you model the beam as a hybrid of the two modes of behavior

@mcrs987 It's definitely swept but not a lot.

@AStarryDawn As I was writing this trying to find the SSME docs again I realized vulcain also has the large swept trailing edge. Just for another point of reference

probably my best looking revision of the ox inducer geometry so far. I really love the curves on these. still quite a lot to do on the rest of this shaft alone though. Then doing it all again for the fuel side lol

@mcrs987 Interesting. Is it known for a fact that it's single-blade? Also, do you have any reference pictures for the trailing edge of the SSME LPOTP?

That was kinda how I went with my previous ones but a couple points of reasoning lead me to do it like this. Mainly this thing needs a ridiculous head coefficient from what I've been able to estimate which is why I've shaped the hub quite bottom-heavy if you will. That more dramatic change nearer to the base felt very wrong with a straight or otherwise very shallow swept trailing edge. Especially in combo with the steep pitch there. I haven't been able to shove any of these into Ansys yet but there's a similar kind of methodology I found utilized in the SSME LPOTP. Trailing edge starts to sweep almost as soon as that bottom heavy part begins. I had to place the very end of the trailing edge at a specific position (length of the hub was already known so I at least knew where I would place it axially). This of course being a single bladed inducer, Extremely novel, never seen it anywhere else so I'm just having to wing it a little bit off my own knowledge. Single blade fucks up the balance of the part if that trailing edge isn't also in a specific position circumferentially (frame of reference to the start of the leading edge, of course). The sweep would influence that position It goes into like six stator vanes under this anyway before going into the 1st stage impeller so even with the small position remaining for the trailing edge it's like meh

@sayittothecurls The better of an engineer I become the more beauty I see in everyday life. It's so easy to believe in divine design,

Ever just soak up how beautiful the world is? Yes, everything might be going wrong, and ghouls control the world, but the whole thing is just so magnificent and awe inspiring. How is any of it real? Or am I alone in feeling euphoria from my mid 20s onward?

@StormSilvawalk1 Congrats! It doesn't look very cold though? What temperature is the propellant you're pumping at?

The first full, integrated, test of my liquid rocket engine turbopump with cryogenic propellant! It has taken me 3 years from paper to this test run and a lot of blood, sweat, and tears. There is lots to change and improve, but overall not a bad first integrated run. Sound on:

@i2cjak @kinotronics understandable, have a nice day

@AStarryDawn @kinotronics Busy and not very much engagement

what happened to @kinotronics @i2cjak ?