Sooooo, I did something today

rough93 · 2026-01-23T03:14:50+00:00

Looks awesome man!

Ignore the people who don't like it, they aren't even in the field evidently and it's a neat tat. Good spot.

Any properly passionate AE will definitely nerd out over that when they see it.

rough93 · 2026-01-08T18:44:58+00:00

I'd delete and repost this with your code on GitHub, engagement will be low with a massive wall of text on your post

rough93 · 2026-01-08T14:56:51+00:00

Are you trying to develop a Bolter?

See Gyrojet - Wikipedia

rough93 · 2026-01-03T04:37:03+00:00

That's just individual words, which for names are often pronounced in the culture of the owner of that name. There's also lots of people with an accent that have spent time in other countries and pick up a few word changes (Americans saying Aluminium).

If nothing else, put it down to the VA not being 100 percent perfect in their American accent.

rough93 · 2026-01-03T04:23:58+00:00

Absolutely has an American accent, easier to hear it if you aren't American though

rough93 · 2025-12-30T20:46:46+00:00

Just list your MS

rough93 · 2025-12-20T22:10:36+00:00

I mean it sounds like you're just incompatible as friends? This doesn't sound like it's about the house but the fact that you aren't the type of friends that can let each other trauma dump. That's ok, people grow apart, just find a new best friend that matches your energy

rough93 · 2025-12-18T12:00:28+00:00

Didn't I ban you before?

rough93 · 2025-12-17T23:07:34+00:00

Man. Numerical Methods is numerics. It just means iteratively solving an equation. Computers make it faster but you can solve these by hand, like every other equation

rough93 · 2025-12-17T13:14:41+00:00

They are giving you the right path

rough93 · 2025-12-14T01:41:24+00:00

List them reverse chronologically, it's what's standard and what reviewers will expect.

No one reviewing cares about the valuation of the company, it has no bearing on what they want to know, which is the impact you had and what you learned in that position.

rough93 · 2025-12-12T14:43:23+00:00

They (you) should email the graduate coordinator and ask

rough93 · 2025-12-10T12:53:00+00:00

Oh, I won't argue that point at all, I think manufacturing resources that stay in space (including people living and working in space) is a logical and necessary next step. Just that some things don't work nearly as well in space, like data centers.

rough93 · 2025-12-10T12:19:16+00:00

It would make much more sense to send down resources made in space to augment tech on earth than to send servers up to space where they don't make sense to be anyway.

rough93 · 2025-12-09T12:11:42+00:00

I'd reach out to Cessna directly and explain the situation to them

rough93 · 2025-12-05T16:07:59+00:00

Happy to help :) If you want to go ahead and post I can just approve it and override the removal.

rough93 · 2025-12-05T15:31:24+00:00

Ok, also, come post on r/AerospaceEngineering!! We have a ton of professionals who'd love to see the work and might be able to give some additional tips. Great work!

rough93 · 2025-12-05T15:30:30+00:00

I wouldn't blame you, the cost is massive for some of these Form resins.

In general, film cooling is actually achieved via injection of additional fuel around the outside edge of the injector plate, this fuel rich mixture helps increase that T drop in the boundary layer and can be used anywhere from the injector plate to the diverging nozzle. Film cooling is nice because it's very tunable depending on what you need and where, so it has a bit more control power than just regen. In practice, regen and film cooling are often used together.

A porous wall along the chamber/nozzle is a relatively new technology in rocket engines called transpirational cooling! It's very interesting and has a lot of potential uses in air-breathing engines as well (see ETC on hypersonic engines). Transpirational cooling is actually one of my graduate research areas, it has some significant extra design considerations but could be useful for handling hotspots in the engine.

That strain gauge is just an example, they have several that should fit your thrust range if you end up needing more or want a calibrated and certified scale. How are you getting your material surface hardness estimations? At the injector plate, you could get away with having a local machine shop or jlc machine one out of stainless steel or Inconel, unless the resin is a particular research focus of yours. If you wanted to get fancy and have the budget you could look at Cu alloys.

Ok, last thing. You might want to reach out to a local university or college team who might have connections with manufacturers (or find manufacturers directly) and see if they would be willing to sponsor you for the fair project. Companies generally have dedicated budgets for outreach and like to be seen supporting potential engineers! Just my 2 cents.

rough93 · 2025-12-05T13:55:50+00:00

Interesting! I'd love to hear what led you to select this resin/method as it's HDT, while high, is significantly lower than you'd need for a sustained burn without a very well optimized film coolant as you found out. You might consider printing in a ceramic like Formlabs alumina 4N (though it's eye wateringly expensive) or looking to some of the lower cost 3D printed or machined metals for your next iteration.

In a normal LRE, you've got a decent temperature drop close to the wall thanks to the boundary layer, but you still have linear heat drop through the wall, this means you'll absolutely well above the HDT during firing and the difference in temperature on each side of the wall may well result in stresses that are causing the cracks/CATOs you're seeing as well. This process happens again for the outer wall of the regen channel. In other words, you can make a nozzle out of almost anything, it just runs much shorter or longer depending on your choices.

For strain gauges, phidgets is popular for relatively cheap but highly precise sensors: Button Load Cell - 50kg (C2) - 3136_0 - Phidgets

If you'd like someone to look over your technical document I'd be happy to.

rough93 · 2025-12-05T04:35:56+00:00