Internal Combustion Engine • Hacker News Board

Re: Internal Combustion Engine

#301

Post by exhaze » Sat, May 01, 2021, 4:59 AM UTC

BlueTemplar wrote: post #225

qwertox wrote: post #164

One of those web pages which deserves an award. Some place in some kind of Internet Hall of Fame, an historical archive which shows the only best highlights of what websites were actually capable of presenting. Milestones of web development. This page summarizes pretty good what web technology is capable of, when in the hands of a real professional. --- Ok, I just realized this is from Bartosz Ciechanowski, and this…

Yeah, and to think that some people are incredulous when I say that I need animation support in my electronic documents ! This is even better, I will bookmark it as an example.

Saw a startup recently building something like “PowerPoint for animated documents” - https://www.unscene.app/

Crazy that no one’s made this before

Re: Internal Combustion Engine

#302

Post by warmwaffles » Sat, May 01, 2021, 4:59 AM UTC

alanbernstein wrote: post #186

tyingq wrote: post #29

The quality of the explanations, and progression of complexity, reminded me of an old video that explains how a car's differential (rear end) works: https://www.youtube.com/watch?v=yYAw79386WI Skip to 3:30 for the explanatory part.

Wow, this video was fantastic, thanks for sharing. I see how the progression reminded you of this, but the physical demo presents as more of a history-of-mechanisms lesson, which is fascinating. I also appreciated the humor. They seem to have built a working mockup of a car with the driveshaft penetrating the passenger compartment, just to make the joke that it would be inconvenient to rest luggage on the spinning sh…

If you really want a rabbit hole, I suggest this guy's channel. https://www.youtube.com/channel/UCwosUnVH6AINmxtqkNJ3Fbg

Re: Internal Combustion Engine

#303

Post by cbsudux » Sat, May 01, 2021, 5:01 AM UTC

This is awesome. How did you create the animations?

Re: Internal Combustion Engine

#304

Post by rocqua » Sat, May 01, 2021, 5:06 AM UTC

TwoBit wrote: post #169

Syonyk wrote: post #140

Earlier quoted context omitted.

I would assume that by some point, if one of his cars won, the officials just took the whole thing apart to find out what sort of bizarre loophole he'd found that met the letter of the requirements while totally violating the spirit. His antics weren't secret, even at the time he was working. He was just really good at it.

And nobody considers that dishonest? It's cheating in the spirit of the rules if not the letter of the rules.

People do, that's why the rules are changed after a while. Competitors are usually outraged. Fans are somewhat split. Rulemakers are annoyed, but don't retroactively change the rules.

Re: Internal Combustion Engine

#305

Post by rz2k » Sat, May 01, 2021, 5:19 AM UTC

ehnto wrote: post #295

jonplackett wrote: post #232

Earlier quoted context omitted.

Love how it's written > While reliable and easy to direct, a cannon ball won’t be very effective at pushing the crank

That was a fantastic metaphor, and though I am intimately familiar with engines I had never thought of the crankshaft as four simple hand cranks stuck together before.

I wonder if it was inspired by well known this classic video explaining differentials.

https://youtu.be/yYAw79386WI

Re: Internal Combustion Engine

#306

Post by geocrasher » Sat, May 01, 2021, 5:32 AM UTC

Wxc2jjJmST9XWWL wrote: post #200

TwoBit wrote: post #169

Earlier quoted context omitted.

And nobody considers that dishonest? It's cheating in the spirit of the rules if not the letter of the rules.

Nope ; Motorsport is always drivers' skills coupled with engineering ingenuity. It's always about "what can I come up with, which gives me an edge, and still somehow is within the rules?" I don't know anything about Nascar, but the history of Formula 1 is full of such little tricks as well. It's just easier to regulate "other sports" than it is to regulate sports that come coupled with a lot of technological involvem…

Excellent comment. I watched the Audi/Lancier video in full. Wow. Amazing stuff. Thanks for all the info!

Re: Internal Combustion Engine

#307

Post by CaptainBanger » Sat, May 01, 2021, 5:45 AM UTC

gfaure wrote: post #279

umvi wrote: post #271

Earlier quoted context omitted.

I'm assuming he used something like SolidWorks to CAD up the parts, but then it looks like he custom made all the animation stepping widgets and camera rotation logic and various shaders for the different effects in pure JS[0]? Surely he didn't write this JS by hand (i.e. it was generated from blender3d or solidworks files or something?). I would like an article on how he made the interactive animations in the articl…

I think it can't be understated how important it is to able to rotate, and move the playback forwards and backwards. It's almost like being able to hold the part in your hands, examine the reasoning behind its structure and "debug" your mental model of it by playing its operation back and forth.

It really reminded me of the educational 'toys' that I used while I was attending Montessori school. You could go at your own speed and come to understand a concept by letting you play with all the constituent parts when you felt like it - or if you saw someone else doing it and joined in.

Re: Internal Combustion Engine

#308

Post by the_cat_kittles » Sat, May 01, 2021, 5:53 AM UTC

jeffreyrogers wrote: post #112

the_cat_kittles wrote: post #77

Earlier quoted context omitted.

cmon man. the total weight of pricey metals in a car is so low, there is no way its going to offset the cost of precision machining. tolerances < 1 thou and callouts for surface finish and perpendicularity are expensive!

I'm sure a motor is cheaper than an engine (less steps to make), but they still require precision manufacturing, and all the other parts aside from the motor (driveshaft, axles, brakes, etc.) are more or less the same. Plus, the cost of those other materials is going to increase if demand for EVs goes up.

evs could drive lithium but i really doubt they would influence copper that much, since it is used so much already

Re: Internal Combustion Engine

#309

Post by richardw » Sat, May 01, 2021, 6:05 AM UTC

Syonyk wrote: post #241

TwoBit wrote: post #169

Earlier quoted context omitted.

And nobody considers that dishonest? It's cheating in the spirit of the rules if not the letter of the rules.

No. You're free to abide by a conservative interpretation of the rules, it just means you'll literally never win against a team with a more creative interpretation. It's very much of a realm of "That which is not explicitly forbidden is permitted." And the range of "explicitly forbidden" tends to be based heavily on what the rules body feels offers too much advantage. It's quite literally a major part of what makes t…

The same ethos added to pro cycling is pretty much considered cheating but I’d guess not in the inner chambers. Fair game as long as you pass the tests? Draw oxygenated blood out and put it back in halfway through a tour. Now that’s called blood doping. Rinse and repeat, for decades:

https://en.m.wikipedia.org/wiki/List_of_doping_cases_in_cycl...

Re: Internal Combustion Engine

#310

Post by stickfigure » Sat, May 01, 2021, 6:28 AM UTC

baybal2 wrote: post #230

kingsuper20 wrote: post #26

Earlier quoted context omitted.

Rotaries are a funny case. Look good on paper. Thermal efficiency issues. Smog. Seals. Noise control difficulties. Weird patches like bridge ports. For modern passenger cars, it's kind of like overcoming the difficulties of two-stroke. In anti-defense of 4-stroke ICE, it seems to me like we are hitting peak wacky complexity of those. Variable timing cams, turn off the cylinders, direct port injection, turbos, variabl…

The problem with ICE industry is that nearly nothing improves much in absolute terms. If you take a look at list of ICE records, nearly all of them were made decades, and decades ago. Biggest piston engines - early 20th century Most powerful piston engines - fourties Most efficient piston engine - Jumo 204 held the record until nineties Most power to weight - eighties Uncounted billions put into engine RnD were mostl…

Like those distorted maps of the united states weighted by population[1], your post should be read with "environmental compliance" as the center of mass. Yet you shrug it off like a footnote. Nobody, except perhaps ship designers, cares who has the biggest piston engines.

[1] http://www-personal.umich.edu/~mejn/election/2016/