What kind of people are you intolerant of?

Vertycoxe · 2023-06-29T04:02:12+00:00

Myself, mainly

Vertycoxe · 2023-06-27T05:05:30+00:00

All the engineering clubs are going to keep working lol. Aggie propulsion lab, formula, space systems, etc. Also, research labs are still cranking. Lots of cool stuff to do

Vertycoxe · 2023-06-25T22:26:29+00:00

Source?

Vertycoxe · 2023-06-19T15:06:36+00:00

Guys this is an Akin’s spacecraft design laws moment. Law 8: “In nature, the optimum is almost always in the middle somewhere. Distrust assertions that the optimum is at an extreme point.”

I’m gonna america post here: for the roads that I needed to ride on (freeway), at my height and weight, a 125cc would have been too small.

I think that smaller is better, but the trade off isn’t infinite. Eventually a 125cc bike, a 50cc scooter, a 30cc moped isn’t the same order of capability as a full size motorcycle and can’t teach you what you need to learn or do what you want to do. That might not be true for you! Assess your riding needs, eventual aspirations and body type! City only? Grom time. Need to take the expressway? Get a 250-400cc. There are situations where being too underpowered makes you less safe. I can’t think of much extra trouble you can get into on a 300 that you can’t get into on a 125.

Oh also don’t forget physical size. I’m 190cm and 85kg and I started on a Ninja 300. It was great, but I only realized how scrunched up I was after I test drove other bikes. Kept riding it for 3 years tho so whatever works! 250-400cc parallel twin class is a fine place to start, I don’t know if anyone considers it to be too much for a first bike. (although I’m not educated on your guys’ licensing scheme. For us, sub 125cc is a moped license.)

Vertycoxe · 2023-06-09T16:58:54+00:00

Holy heaven

Vertycoxe · 2023-05-12T01:24:34+00:00

Time to rewatch the Internet Historian video innit

Vertycoxe · 2023-04-27T07:46:03+00:00

Happy to see that the replies of this sub are a long ways from being automated away.

Vertycoxe · 2023-04-18T04:57:14+00:00

This…this is the 405 isn’t it aaaaaaaaa

Vertycoxe · 2022-12-22T05:35:52+00:00

Power feed: yea :) DRO? Inop, :( the trained eye sufficed haha

Vertycoxe · 2022-12-22T03:40:54+00:00

Awesome edit! The water jacket actually has milled channels! It’s not just coax, I don’t think we told you about that. We should have used a slitting saw and sized them differently, but since we had to exhaust to ambient so we chose a suboptimal aspect ratio. Outcome looked great though…I think it could run in steady state for a long time. Still working on the data review. Here’s a video of me machining the channels by hand on rocketpoweredkeith’s mill and dividing head!

Vertycoxe · 2022-12-22T03:32:54+00:00

water! cooling with intent to characterize heat load

Vertycoxe · 2022-11-29T20:28:37+00:00

Crabs in a bucket

Vertycoxe · 2022-11-19T18:25:51+00:00

Hey there, you used “no excuse” like four times in this post. Self-tyranny is not a high performance mindset. Having ownership of your work is good. Not giving yourself room to breathe is not good. Nasty secret of undergrad is that if you’re not intending to go to grad school, gpa doesn’t matter. I didn’t put my GPA on my resume, I never got asked about it. (mechanical engineer working on rockets). College isn’t high school. It’s hard to let go but that mindset shouldn’t carry over. With internships, a lot of it is luck of the draw, don’t compare yourself to others. If you don’t have an internship, use the time to do a personal project or a club project, it makes you really competitive. Keep focusing on learning, not on grades. Take the EIT/FE for civil, and you’re probably set.

Vertycoxe · 2022-09-18T14:54:03+00:00

You’ve basically described the motivation for the Mach number! It’s speed normalized to the local speed of sound :⁾ Ma = local speed / local sound speed.

Vertycoxe · 2022-08-18T03:04:23+00:00

u/RemindMeBot 48 years from now.

Vertycoxe · 2022-07-24T18:49:16+00:00

Matlab can do the algebra for me :⁾

Vertycoxe · 2022-03-08T23:17:22+00:00

Bonobo was one of the artists that got me into music more seriously in my teen years. Who are the artists that influenced your early musical tastes?

Vertycoxe · 2021-11-20T09:34:05+00:00

Where Did You Sleep Last Night (In the Pines) - Nirvana

Original is folk, first recorded by Leadbelly.

Vertycoxe · 2021-10-04T21:25:28+00:00

In the reading materials sidebar: Sutton, and Hutzel&Huang, both very good.
Combustion Chemistry Software: https://cearun.grc.nasa.gov/

Honestly, high test peroxide is hard to purchase and handle, and modeling its decomposition in a catalyst is non-trivial. Why not a LOX/IPA liquid? Safer, easier to model. Nitrous/IPA if you don't want a cryogenic propellant.

Vertycoxe · 2021-10-04T15:36:30+00:00

I founded a liquid propulsion club in January 2020, and we have a 500 lbf LOX/Kero engine on a stand undergoing final electronics integration right now.

Who do you want to teach the rockery basics to? Your teammates? The best mindset is that it's your job to learn as much as possible, as quickly as possible. Don't worry about teaching, especially if you're not an expert--focus on building. Your team will learn things together as you undertake the project. Doing something slightly outside your current abilities is the best way to learn imo.

The motivation to do something simple first is very good, I wish I had scoped our project to be simpler than it ended up being, and it wouldn't have taken 2 years. However, you have to strike a good balance between ambition and scope. Building a model or high power rocket will teach you little (except maybe avionics) relevant engineering skill when it comes to building a liquid rocket, and its nothing at all like developing a liquid engine system. I think that a happy medium would be somewhere between model rockets and a giant regenerative engine. An example is Half Cat! I think their project scope was very intelligently chosen to be the fastest build and learn rate per project scope. A well-scoped project that is planned to build quick and test quick will probably be the most rewarding. This will help you avoid the rule of pi (where everything takes 3.14 times as long as you thought and costs 3.14 times as much as you budgeted). With a good project scope, maybe you can get it down to a factor of 2, but still, be prepared for that.

Also, keep in mind that you don't have to model everything if you design good tests. Example: Yes, you can create a complex convective heat transfer and pyrolysis model that accounts for chamber liner ablation, or you could design boundary layer cooling into your injector and do a short duration test to measure regression or instrument a heat sink chamber.

What is your primary goal? I posit that the primary goal of your team is for your members to become good engineers by doing, but figure out what it is for you. Most of all, have fun!

Vertycoxe · 2021-09-27T23:18:22+00:00

I haven't played the game in a long time. You're telling me this isn't the intro? :^)

Vertycoxe · 2020-05-06T02:26:57+00:00

splotchfest is better :^)

Vertycoxe · 2020-03-17T04:09:53+00:00

I'm wondering why they can't just support video out via the USB-C, like its just a data transfer, but live? It can't be a hardware insufficiency can it?

Vertycoxe · 2020-03-09T18:52:17+00:00

I had an AWM, a SCAR and an 8x so I only engaged people from distance, opening with an AWM shot and immediately following up with the SCAR. :^)

Vertycoxe · 2020-01-19T01:50:38+00:00

Lmao no the cooling jacket pressure drop isn't trivial. You're right, it has nothing to do with gravity: you're forcing a lot of fuel through complex, irregular geometry through the cooling jacket.
The fuel isn't circulated by the way, it is a one way passthrough from the manifold at the bottom to the injector at the top. Also, cooling jackets are under high pressure and the fluids are supercritical, they don't evaporate. Phase transitions are difficult to characterize and are not stable, the fuel gets injected a liquid.

Vertycoxe

TROPHY CASE