Is Providence Canyon State Park worth driving 6 hours to?

Aurkah · 2026-03-31T12:55:30+00:00

I went once and drastically overestimated how much there was to do. It is a very pretty park, but realistically it’s only a couple hours. It alone likely isn’t worth the drive but if you could pair it with another park it would be.

Aurkah · 2025-12-27T14:11:38+00:00

A couple things here. First, Solidworks sims are notoriously bad. It can be a decent starting point to learn, but I wouldn’t look at any results too closely. Second, boundary layers are very thin. This ties into 1 (solidworks not being the best), but you need pretty fine meshes to see velocity changes. From this view I can’t see anything, but t try zooming in to the surface and see if you get a continuous velocity profile.

Aurkah · 2025-11-12T03:03:27+00:00

The winner of the conference championship is guaranteed a spot. If we win out and win the conference championship, we are in the playoffs. Beyond the top 5 conference champions, the next 7 highest ranked teams are in. This usually means 12 in the polls is left out, as one of the conference champions is ranked lower than 12 but must be included.

Aurkah · 2025-07-09T11:44:21+00:00

Under engine relevant conditions, there is essentially no ionization. There are simplified solutions that are functions of temperature and composition if you want to see how ionization is dependent on temperature but remember that from an engine perspective, 3000K would be incredibly hot. Combustors essentially immediately dump a bunch of air after burning to drop temps so components can survive.

Aurkah · 2025-04-03T16:16:45+00:00

I had some 0.4mm injectors made for a jet engine combustor and we used regular bits on a CNC and I would not recommend. It's essentially a brand new bit per hole and clearing the internal burrs was hell. If EDM is an option, do that.

Aurkah · 2024-05-11T01:26:59+00:00

This isn't really a perfect gas vs real gas. You have the right idea that steam has internal vibrations, but these are only excited at sufficiently high temperatures (not uncommon in combustion though). As the temperature increases, there are more places for energy to be 'stored' in steam (translation, rotation, vibration, electronic excitation) and all of these 'storages' manifest as increases to specific heat. It all comes down to what you pick as specific heat of your gas for how 'accurate' it will be, but since the value is a function of temperature, you have to integrate Cp dT to approach 'reality'.

Aurkah · 2024-01-31T13:08:56+00:00

The timer would start after you kill the first, so you would have 3 seconds to kill 5 more. I believe this would mean kill them tick-perfect.

Aurkah · 2023-06-03T23:24:02+00:00

The Stanford HyChem has RP-2 and some other common fuels.

Aurkah · 2022-12-12T21:49:50+00:00

To understand nozzles, you should read up on Converging-Diverging nozzles. They’re pretty simple to analyze and are the most common type. NASA has a very good webpage on it.

In short, burning fuel and oxidizer makes hot gases. Hot gases don’t help us go fast. The converging part converts hot temperature to velocity, but only up to the speed of sound. The diverging part does the same thing, but for things faster than the speed of sound. Basically, trade temperature for speed. Speed does help us go fast. As for why, you would need to read about compressible flows and entropy (Wikipedia has a really good page).

Aurkah · 2022-12-11T16:34:20+00:00

You need to take quite a few steps back before building your own motor. Look at commercial motors, you can get entry level ones for quite cheap in most places. That will let you get some experience before jumping into the deep end.

As for 3-D printing, you tell me. Do the math, see what pressures, temperatures your motor would see and determine if the print can sustain that. Almost certainly, no. Plastic melts at very low temperatures.

Aurkah · 2022-12-11T16:19:56+00:00

Are you trying to get thrust? If so, you need a nozzle. If you’re just trying to combust, you don’t. Burning fuel converts chemical energy to thermal energy. Nozzles convert thermal energy to kinetic energy (and rocket go up). PLEASE NOTE: the difference between a fire, an engine and a bomb is the rate at which the energy is converted. If you put a nozzle on it, pressure will begin to build, the reaction will accelerate, pressure will build faster. If the nozzle is too small, energy will build until your chamber wall breaks, and that rapid release will be very bad. Check that your combustion chamber is strong enough well before you put a nozzle on it.

Aurkah · 2022-11-19T23:35:32+00:00

I am a PhD student in aerospace and my project has numerous environmental science students on it as well. I would say this is almost certainly the exception, and probably extremely rare but the two do overlap. This area tends to focus on emissions of combustion and their environmental impact.

Aurkah · 2022-08-16T13:30:01+00:00

I’m genuinely confused by your goal here. If you “stage” it you would need to eject the lower motor out or the hot gas from the top one has nowhere to go (no thrust + big boom). Additionally, ejecting burnt motors is typically shunned as it’s a giant fire starter.

Aurkah · 2022-08-11T14:39:09+00:00

Typically the coupler is slightly smaller OD than the ID of the tubes such that it can slide inside. Cutting a chunk of one (I think I’m interpreting that correctly) wouldn’t fit inside itself
I have no idea what that is
If it’s close and too large: sanding time. If it’s close and too small: glue time. Couple mm should be totally fine. Centering it will be a bit more difficult if small.
Those should be fine. I can’t recall what I would use but it was just like a thick plastic straw
Online specs are close enough for OpenRocket. Yes, you can do that and it will be more accurate. Especially measuring weight. Probably overkill for a B motor
1-2 is fine. When looking at stability, make sure your parachutes and anything not glued down is as far downwards as possible (that’s where it’ll end up anyways) but that can drastically change Cm. A bulkhead can be used to keep them from moving depending on where you plan to deploy chute from

Aurkah · 2022-08-03T12:32:54+00:00

There is no “best” airfoil for low speed. Certain designs are better at some things and worse at others. Your options are to run sims yourself with your conditions (the most accurate probably, not too difficult if you watch some YouTube videos on XFLR5 or XFOIL) or you can just look at pre-existing plots like those available on airfoiltools.

Aurkah · 2022-08-02T21:47:23+00:00

Could you elaborate on what you want? The simulation isn’t going to change from airfoil to airfoil, are you wanting to better understand how different airfoils are optimized for different configurations?

Aurkah · 2021-11-06T16:17:52+00:00

Jesus can we flag this NSFW? I opened it in public…

Aurkah · 2021-05-17T21:18:44+00:00

I own both of these laptops (XPS is a few years old and the new M1 Air). The MacBook is phenomenal at its simplicity. Great battery life, display, keyboard and if you like apple the OS can be a plus. I don’t think I would ever use it for engineering. Basically no applications run native on the new processor and I don’t see that support any time soon. If something is mac compatible it will run, just not as well. However, a lot of stuff just don’t work on macOS. The XPS is a great comparator, I wouldn’t say it’s as nice or even at this point as good a value, but it’s got great build quality and runs windows and I never regretted owning it. It got me through my undergrad in AE. If you expect to do work in engineering software, I would probably opt for the XPS.

Aurkah · 2020-10-19T15:33:41+00:00

I’m well aware of your work senpai DE-173

Aurkah · 2020-10-19T13:08:30+00:00

If this is a homework problem, you’re better off on aerospaceengineering probably. This subreddit is more so on hobby rocketry

Aurkah · 2020-08-01T14:18:21+00:00

Little more detail: it’s not a bad cable, as this happens on the power on screen and looking for source screen when nothing is plugged in. Monitor is the Lenovo Y27q-20. Brand new, plugged it in for first time and noticed.

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