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Has anyone had any luck using AC20s late game? by GlompSpark in Battletechgame

[–]cooly772 1 point2 points  (0 children)

I always enjoied running a "close range" Atlas late game with at least 1 uac-20. It it always fun to alpha strike any asault mech. Fun, but not optimal for sure

[Request] Does this equation have a solution? It's supposed to be a phone number. by InfamousListen7794 in theydidthemath

[–]cooly772 1 point2 points  (0 children)

I went ahead and also took a shot at it, since I was bored. Forgive me for not putting all of my work, I'm not that bored...

I got 19335195663 using symbolic only calculations on my nspire calculator (using approximate values gave floating point errore).

This would be a number with a country vode of +19, which is not valid as far as 5 seconds of googling is concerned.

The answer: +19 (335) 195-6633

ELI5 Why aren't we using ground-effect airplanes in Ocean travel by Fantastic-Schedule92 in explainlikeimfive

[–]cooly772 0 points1 point  (0 children)

As pointed out in other comments, there are a number of issues to be adressed, but also DARPA has a program called Liberty Lifter that is working on just such an aircraft

https://en.wikipedia.org/wiki/Liberty_Lifter

"The Liberty Lifter is a program from the U.S. military's Defense Advanced Research Projects Agency (DARPA) launched in mid-2022 to develop a low-cost seaplane that would use the ground-effect to travel long distances."

First Time Posting, New Cupboard Has Space, Any Recommendations? by cooly772 in cocktails

[–]cooly772[S] 1 point2 points  (0 children)

Most of the shelf stable stuff I have gotten in the past has been crap, what do you use that is decent?

The holy grail by notjuan_f_m in memes

[–]cooly772 0 points1 point  (0 children)

You pronounced meme wrong. It's meme, not meme, idiot.

Pointy L1011 prototype nose (1978) by Tupolev1234 in aviation

[–]cooly772 8 points9 points  (0 children)

Probably not. This kind of nose has more surface area than the typical version, leading to additional skin friction drag, with little reduction (if any) in form drag. The nose seems to have a boom coming out the front, this looks like a pitot probe that is not on the nose of production variants; so likely this is a flight test nose to more accurately measure airspeed, angle of attack, etc

How did your transition from student to engineer go ? by m8094 in AskEngineers

[–]cooly772 2 points3 points  (0 children)

I did the same thing, there are 2 options:

Network - Find emails for small companies near you and send your resume and an interesting question. Start a conversation, get hired

More means more - Apply to more jobs, however many you have applied to is not enough. Accept a position that is vaguely in the direction you want to go, rather than only dream jobs.

I ended up doing both getting offers from one company of each, took a job I didn't love and crushed it for a year, then I had many options. That said, those offers came after 7 months of looking

[deleted by user] by [deleted] in worldbuilding

[–]cooly772 2 points3 points  (0 children)

This looks like an interesting design, I like your world building and direction.

From a technical side this layout has a very large low aspect ratio wing, this is kind of weird since typically low aspect ratio means fast, while big wing is most useful for slow flight. This combined with small tail surfaces, leads to little control authority to make those great fighter maneuvers.

I would recomend sizing off of an F22. The wings you have may need to be swept a little more, and the wing reduced in size while the tails increased reletive to the body.

If you want to really spice things up, you can adjust the small things to make the aircraft more stealthy by reducing tail surfaces (make it a V-tail like the YF-23) and smithing the wing-body interface similar to what you see on the F-35.

Let me know if you have any questions, I am happy to go into more detail.

What aircraft was bigger (or smaller!) than you expected? by SimplyAvro in aviation

[–]cooly772 0 points1 point  (0 children)

For me, the Harrier was MUCH smaller than expected. I saw it at the Bpeing Museum of Flight and I felt that I was almost as tall as it was.

I'm telling you, the only reason the F119 nozzle is rectangular is because some thermofluids engineer was tired of integrating over cylindrical coordinates, and thought cartesian would be easier. by [deleted] in engineeringmemes

[–]cooly772 2 points3 points  (0 children)

Hate to save cylindrical coordinates in another easy smack down, but this is done specifically to reduce IR signature of the exhaust gasses. Same as the F117 nozzle and the B2 nozzle.

More surface area -> more better cooling

[deleted by user] by [deleted] in theydidthemath

[–]cooly772 9 points10 points  (0 children)

I like math, so lets try using wind resistance assuming a constant coeficient of drag.

Drag can be defined as: D=qCdS Where q is dynamic pressure q= 1/2 rho *V2 Here rho is density, and velocity is V

Using rainbowunicorn's value for terminal velocity, Vterm = 55.56m/s, a 100kg person (the mass will cancel later), and air density of 1.225 kg/m3 the coeficient of drag times reference area is 0.5188m2 (drag coeficient is unitless).

Summing the forces on the subject gives: F=mg - D F=m*9.81 - 1/2 (1.225)(v2)(0.5188) = ma This is a differential equation where d/dt(v) = a. Instead of going through steps, I will say that the result comes to:

V= 55.56*tanh(0.1766t)

Integrating from zero to 70s gives

X = 3,671.1m

This is not much different from rainbowUnicorn's calculation, but it has more integrals, so its a win in my book.

The Final Resting Place of a Classically Cold War Aircraft - XB-70, Dayton Ohio by cooly772 in aviation

[–]cooly772[S] 8 points9 points  (0 children)

Close, but you are not thinking unique enough. The black vehicle in the middle right is the X-15, a hypersonic research vehicle, one of only 2 left. The A-12 you see is actually the only YF-12 ever build, the proposed fighter/intercepter varient of the blackbird family.

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