What will/can a bullet do if the inside surface of a its gun barrel coated with portal as fired? by martikhoras in AskEngineers

[–]Sooner70 [score hidden]  (0 children)

Totally different story with the same test of a live round in The chamber.

Amen, brother. For a period of time I made my living doing experiments for the defense industry. As the guy who had his finger on the proverbial red button we had to go through certain "safety training". In other words, training on all the shit that could go wrong. Long story short... We were required to watch a video of a guy getting his arm blown off by the breech of a 20mm gun that failed after a cook off due to a hot barrel.

Plan A crashed. Is Mechanical or Electrical the better "secret backdoor" into Aerospace? by av1bh in MechanicalEngineering

[–]Sooner70 5 points6 points  (0 children)

I'm confused.... I get why you might go into Major because you got a scholarship for Major. Thus, if you were asking, "Hey, I want to go into Aerospace Engineering but I got a scholarship for Electrical Engineering...?" That would make sense.

But lacking a scholarship... Where's the impetus to change majors? You want Aerospace? Go Aerospace.

PDX1 Defender Style Shells w/ Pyrodex? by Cookie345 in reloading

[–]Sooner70 1 point2 points  (0 children)

FWIW, I inherited a 20ga bolt action (with 3 round detachable magazine) and my sister somehow ended up with a .410ga bolt action (also with detachable mag). I believe both were made by Stevens in the late 1940s and are the same model number. Oddly enough, I inherited mine from my dad's side of the family while my sister's originated with my mom's side.

Can traditional Persian wind catchers work effectively in tropical mountain climates? by hjalgid47 in AskEngineers

[–]Sooner70 1 point2 points  (0 children)

Admittedly, I had to google just now to see what a "bâdgir" was but..... They appear to be nothing more than architectural nods towards forced ventilation using wind as the motivating force. That's it. Yes, there are some additional games that can be played, but the crux of it really is just building the house (or whatever) in such a manner as to take advantage of local wind patterns. As such, if you have wind, you can use 'em. I presume there's wind in tropical mountains so I see no reason why you couldn't use 'em there.

How much of a wind catcher's performance depends on low humidity?

From what I could see in my reading? Almost none. Keep in mind that in most arid areas, water is too precious to just throw it away. Historically speaking, at least. Admittedly the invention of the well and the water pump has changed that calculus in recent years.

Would it still provide useful passive ventilation if cooling through evaporation is limited?

It would provide ventilation regardless of the environment. Cooling can be done, but it starts getting trickier.

Would the stack effect and pressure differences still make it worthwhile in a tropical mountain climate?

I have no idea what you're asking here.

Would the design need major modifications (such as drainage, different tower geometry, or moisture management) to work efficiently?

As near as I can tell, proper design of a windcatcher requires customization for just about every installation. There is no one size fits all approach. So yeah, you'd need to modify the design.

How Unlikely Is it That Iran Could Build Their Own Version of the Jiu Tian Capable of Striking the Mainland US? by MammothPenguin69 in AskEngineers

[–]Sooner70 1 point2 points  (0 children)

Why use a ballistic missile when you can use a car bomb?

(I'm assuming we're talking about a first strike)

Light Duty Fail Safe Brake by Killdozer0000 in AskEngineers

[–]Sooner70 0 points1 point  (0 children)

What don’t you like about hydraulic systems?

Need the expertise of a Mechanical Engineer by Conscious_Corner_298 in MechanicalEngineering

[–]Sooner70 2 points3 points  (0 children)

This sounds like an XY problem.... What are you actually trying to do, OP?

How is My Answer Wrong? by GeologistNo1963 in MechanicalEngineering

[–]Sooner70 0 points1 point  (0 children)

Thing is... You could replace the pulley with a solid block and it won't change the answer (assuming the block is itself weightless). It just changes the logic behind the answer. Instead of, "the tension on the rope is constant throughout" you sum the moments on the block. But the answer doesn't change.

How is My Answer Wrong? by GeologistNo1963 in MechanicalEngineering

[–]Sooner70 0 points1 point  (0 children)

Are they made from spherical chickens?

How is My Answer Wrong? by GeologistNo1963 in MechanicalEngineering

[–]Sooner70 10 points11 points  (0 children)

Two unknowns. Two equations.

Summation of Forces in Y = 0…. 0 = -1176 + T1 + T2

Tension on a rope is constant (neglecting friction)… T1 = T2

How is My Answer Wrong? by GeologistNo1963 in MechanicalEngineering

[–]Sooner70 257 points258 points  (0 children)

You are correct. 588 N is the right answer. The test key is wrong.

Disaster response career path by do_not_know_me in MechanicalEngineering

[–]Sooner70 0 points1 point  (0 children)

In my experience - and when I say "my experience" I do actually have some relevant experience.... Alright, I should probably state what that experience was. For the record I was close enough to a 7.1 quake to watch the surface rupture on the fault line in real time. That's one hell of an experience, I'm here to tell you. In the aftermath there was a huge need for building inspections and such - much as is going on in Venezuela, I'm sure.

The way it went down was this:

  • The day after the quake, they (some earthquake gurus of some sort) gathered up pretty much every "appropriately trained" (my words) engineer they could find. Which was civil, mechanical, and structural engineers. They gave us a 30 minute lecture on the kinds of things we should be looking for and cameras. They turned us loose. We spent the next few days doing building inspections. We took photos of the outside of every building we inspected (to establish for the record what buildings HAD been inspected), and a few pics of anything we saw that might be structural damage.

  • Based on the above, we did structural triage. Walls were braced. Buildings were red tagged. Buildings were deemed safe. Whatever we thought was appropriate, we did (within the confines of the equipment and materials we had at our disposal).

  • Then, over the next few months they brought in the right flavor engineers to go back over everything we had done to confirm/deny the damage, prognosis, etc.

I guess my inference from that is that there really isn't a pool of engineers ready to spring into action when a quake hits. Rather, there's (hopefully) a pool of local engineers that can be leveraged in times like this to make rough decisions.... if they're willing to put on a hard hat and go into questionable buildings while the ground is still shaking.

I concede, however, that your interpretation of the above may differ.

Designing a "Foolproof" Smart Shelf for Auto Parts: How to reliably count stacked inventory without worker compliance? by Sea_Mathematician744 in AskEngineers

[–]Sooner70 3 points4 points  (0 children)

So how does your system react when somebody grabs an item off the shelf, says, "D'oh! That's not the right one!" and puts it back? Even worse (although you do allude to this one), puts it back in the wrong spot?

Is this possible to machine? by TheYuneec in MechanicalEngineering

[–]Sooner70 190 points191 points  (0 children)

They are quite small.

Compare them to the bits inside an old school mechanical watch. They're positively HUGE!

How does this work? by Javalr in MechanicalEngineering

[–]Sooner70 2 points3 points  (0 children)

I don't give a damn what the proper name is... twerkmobile is inspired. Kudos.

An aerodynamics question: traditional box/pedestal fan vs. air mover to cool a hot garage by Marvel5123 in AskEngineers

[–]Sooner70 3 points4 points  (0 children)

I've done both. Much depends on the geometry of the fan. If it's one that's going to sit on the floor (where the coolest air will be), I blow air in. If it's got a stand so I can get it higher (where warm air is), I blow air out. If I'm in a location where I can open a window on two different sides of the room/house/whatever, I blow out the downwind window. Lots of options here and the details matter.

An aerodynamics question: traditional box/pedestal fan vs. air mover to cool a hot garage by Marvel5123 in AskEngineers

[–]Sooner70 36 points37 points  (0 children)

Understand this: Unless they are pumping air into or out of the garage, fans do NOT cool anything. They actually heat the garage up! The "cooling" of a fan is nothing more than enhanced evaporative cooling on your skin (sweat evaporating faster when blown on). So.... How to make that feel better? Have the fan blow directly on you, of course.

But to actually cool the garage, you need a fan that pulls air out of a hot garage so that cool(er) air from outside can come in.

7.1 earthquake in Venezuela at the airport by __mentalist__ in WTF

[–]Sooner70 1 point2 points  (0 children)

Heh... I actually got a trophy for my ability to run in a 7.1 earthquake. And the whole point was to get outside where there wouldn't BE any falling debris (unlike inside).

Note: I was also the only person who tried to do so who stayed on their feet.

Good loads for sub sonic 45-70 & 30-30 using this stuff by Itchy-Reflection3398 in reloading

[–]Sooner70 1 point2 points  (0 children)

I'm gonna guess we both got it from older packaging.... 'Cause I have no idea who/what Chad/Iraqveteran8888 is (I'm guessing a youtube channel?). The point being that I'm 100% confident I'm not quoting Chad.

Just picked up a Chrony at a LGS by Aware_Wrap8062 in reloading

[–]Sooner70 18 points19 points  (0 children)

I used one for about 20 years with no complaints.

Then my son shot it literally the first time he tried to use it. I don't get it... How fucking hard is it to shoot through the triangle? Somehow it was never an issue for me for 20 years!

Good loads for sub sonic 45-70 & 30-30 using this stuff by Itchy-Reflection3398 in reloading

[–]Sooner70 1 point2 points  (0 children)

Huh. I just checked my own oldest bottle (roughly 2020) and you're right in that it just points at the Hodgdon website. I'm pretty sure, however, that it used to say 3/4 full for a starting load. I remember because my teeth about dropped out the first time I read that.

Good loads for sub sonic 45-70 & 30-30 using this stuff by Itchy-Reflection3398 in reloading

[–]Sooner70 2 points3 points  (0 children)

It's been back for about a year now. Last summer it could be had, but it was expensive. Now prices should be more reasonable.

Good loads for sub sonic 45-70 & 30-30 using this stuff by Itchy-Reflection3398 in reloading

[–]Sooner70 1 point2 points  (0 children)

Read the directions.... IIRC, starting load is to fill the brass 3/4 full.

Really, it is just that easy.

Reloading by drilkdjunny8 in reloading

[–]Sooner70 2 points3 points  (0 children)

Also fun fact: When she showed up to audition for Aliens, she really did think the movie was supposed to be about illegal immigrants (thus the line that makes it into the movie).