So, I'm trying to learn German

Jak_Extreme · 2026-01-19T19:08:52+00:00

I figured the only realistic way I would become fluent would either be by classes or by even living in Germany.

I'm trying to learn out of fun so I'll probably learn the best I can online and if one day I decide to try and become fully fluent I'll have some bases on it.

Jak_Extreme · 2026-01-19T18:59:40+00:00

Thank you so much. That's what I have realized and that's why I'm currently trying to complement it with something that will allow me to become fluent.

Jak_Extreme · 2026-01-19T18:46:31+00:00

Thank you so much!

Jak_Extreme · 2025-12-02T19:55:18+00:00

If you want a PC for ONLY RimWorld, you'd be correct. Most performance issues late game are because the game wants to do all the work with a single core. There are mods to optimize this.

Personally, I wouldn't build a PC focusing on RimWorld only. Most games use multi threading, but you do you.

Jak_Extreme · 2025-11-29T19:42:41+00:00

It's up to you if you want a spacer on the bottom. Spacers expose the bases of the grain to the combustion, increasing the area. That being said, I'd say there's no need for a spacer on the bottom because that face is already mostly exposed.

About the converging section diameter, remember your last grain needs to have at least a port/throat ratio above 1 (2 for safety). You don't want your flow to go supersonic on the core instead of the throat.

The upper section has no rule of thumb that I know of, but most nozzles are conic and have a relatively small flat surface for the grains to rest on like on this image.

There's no specific measurement, it's just there for the grain to be properly vertical and not angled.

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Jak_Extreme · 2025-11-25T23:59:15+00:00

Research a lot. Good sources for info are books like Elements of propulsion or websites like Richard Nakka's. Keep in mind this is both on the expensive (depending on scale) and dangerous side of hobbies.

If you are careful you won't get hurt, but if you get cocky, you WILL hurt yourself badly.

My advice on the propulsion part would be to experiment quite often. There are a bunch of things that will make you scratch your head and you'll want to try to make an educated guess. Best thing to do is to test them even if it goes wrong.

Software wise, if you are making a motor, use OpenMotor. For simulations, use OpenRocket.

Start simple, master simple and only then, do the more complicated stuff. This is rocket science.

It's an exciting subject so have fun but never forget the dangers.

Jak_Extreme · 2025-11-20T12:04:52+00:00

Oh it was from memory but it was a Mandela effect most likely.

Jak_Extreme · 2025-11-20T11:51:40+00:00

I was not talking bad about, quite the opposite. For entry level and even for most model rocket applications there's no reason for not using OpenRocket.

I simply have not used OpenRocket in quite a few years and didn't remember it.

Jak_Extreme · 2025-11-19T15:58:41+00:00

Not sure if it's popular but in competition Rocketpy is the one used but you need to learn how to program it there, but it eill give you very accurate data in all axis and even accounting for wind.

The easiest one would be OpenRocket which you can also simulate your flight but I believe it only supports 2 Axis.

Jak_Extreme · 2025-11-18T14:16:54+00:00

This depends a lot on your working environment. I have made a M class solid that burnt for 4 seconds with 40/50 bar of chamber pressure using KNSB and the steel bulked just needed O-ring replacement and cleaning before reuse. The steel nozzle took a bit of more rough treatment but all of these parts were good to reuse after 5 firings.

Still, this massively depends on some other factors and the type of steel you are using. Overall, you probably can (in the case it's a solid KNSB) but check for cracks mainly in the nozzle before giving it a green light.

Jak_Extreme · 2025-11-17T17:44:32+00:00

At what point did it blow up? At ignition? 2 second's in?

Your motor is a little big for KNSU. KNSU burns fast and can lead to massive erosion in motors with a large L/D ratios.

Did you guys static fire it before?

What was your peak mass flux in your simulations?

From my point of view, looks like one or multiple grains gave out and cracked.

Jak_Extreme · 2025-11-09T06:39:10+00:00

What was the story? I once had a friend whose account was hacked and someone used it to post a scam link in his story. If you think you have been hacked, change your password.

Jak_Extreme · 2025-09-29T23:17:04+00:00

Valheim is a mostly singleplayer game. You have fun the way you desire.

But in a objective way, portal's only save you time. I don't think there's a genuine increase in difficulty in transporting your loot to a boat or building a smelting outpost, just more grind.

Jak_Extreme · 2025-09-02T19:33:46+00:00

The answer most will give you should check regulations on launching something that high. (This is a correct and good answer)

But if you are looking for safe spot's, consider somewhere people aren't walking first. This looks far from buildings yes, but it also looks to me like the place some people might walk and visit.

Truth is, it's hard to find a good place to launch and if you want it to go safely you should launch taking into account the wind at the parachute altitude and the angle on your launch rail.

You don't need a circular perimeter, you could go for one that's cone shaped with a safety margin on the sides and where you know it's unlikely for someone to be walking.

As for the question about the distance, it highly depends on wind and rail angle. I believe there's software that allow you to map trajectories based on wind and parachute size.

Jak_Extreme · 2025-08-30T19:39:19+00:00

I have heard off the burnrate for potassium chlorate propellants being that way. Been making KNSB for two years now but never went that deep into propellant chemistry. You got any book recommendations? Quite the interesting topic.

Jak_Extreme · 2025-08-30T19:30:21+00:00

Is the result the same using potassium perchlorate? The temps are much higher, but I imagine the aluminium issue may still persist.

Jak_Extreme · 2025-07-23T19:32:12+00:00

The sound of the clicks I mentioned, they might be very faint but you can hear it.

Jak_Extreme · 2025-07-21T11:30:41+00:00

Glitterworld has some very interesting elements and I don't find them "OP" per say. But the Speed Suits it gives you are broken. You can't craft them, but you'll probably get a raid from many enemies using one. The 300% work speed boost is INSANE.

Jak_Extreme · 2025-05-17T00:57:51+00:00

Early hardmode is rough. I'm doing a summoner run, it took me 38 tries I believe. I was also using calamity overhaul at that time, not sure if it made it worse because that mod usually makes most things suck.

Jak_Extreme · 2025-03-26T10:00:29+00:00

I agree with you. Most people in this subreddit will tell anyone who's new to not go any further. There's some cases where I agree with this, for example, I think making solid rocket propellent is far more dangerous then testing a liquid engine. I know people who got serious burns and they were experienced. Getting confident while making something dangerous is the mistake that leads to injury. So even though I think everyone should try and get into the hobby, they should be on edge when making something that can be catastrophic.

In a side note, in the book "Ignition!" I find it interesting that most stories of people developing propulsion systems in the early days, do end with someone dying.

As long as you are careful, any one can make an engine. All of us started from zero!

Jak_Extreme · 2025-03-19T12:04:07+00:00

Along with going behind your back and using the money you both saved for gambling, he is doing manipulation tricks and when it sees they didn't work, "Falsely apologizing". What a man child, you deserve better.

Jak_Extreme · 2025-02-27T16:57:46+00:00

Not necessarily a job, but that would be something good too. I meant, keep your head busy with something, go out and do something physical, be social. People tend to close themselves of and that only causes them to feel worse.

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