#engine

quetzop1@diasp.org

Internet

I'm really annoyed by the #Internet of today:

  • #Trackers and #data #collection everywhere
  • #JavaScript-heavy #Web #applications instead of document-oriented #websites
  • No #JavaScript most often translates to an empty page with a single sentence: "Please activate JavaScript"; the page content however is often nothing that actually requires JavaScript, the website creators just want to feel like actual #application #developers, so they re-build much of what the #browser already supplies with #inefficient and #bug heavy JavaScript code
  • Content almost always behind a #login wall
  • More often than not only very superficial #information
  • #Ads
  • Thousands of 3rd party JS files included, most of which have the only purpose of tracking you across websites
  • #Misinformation and #biased #information everywhere
  • Deliberately misleading advertisment, sich as "save 80% now", and artificial time pressure)
  • "Best viewed on #Google #Chrome"
  • "Login with Facebook"
  • Newsletter subscription and cookie pop-ups featuring #dark #patterns
  • #Search #engine #optimization ( #SEO ) acts in the worst interest of the user by skewing search results
  • Artificial restriction of web #app functionality to promote their native apps
  • Large parts of the Web are only accessible by #smartphone
  • You have to provide your #phone #number to login
  • If you didn't provide a phone number, your account is being blocked right after the initial login because we suspect you being malicious actor because why not (=> #Instagram, #Facebook)
  • #Proprietary #platforms are required to participate in public #online life (Amazon, Google, Facebook, Instagram, Twitter, YouTube)
  • One-sentence-paragraphs and sloppy language (especially found in #Medium #articles)
  • "We care about your #privacy" actually means: "We were forced by law to do this shit, we just want to collect and store as much information on you as possible to make money off of you now or in an undescript future"
  • JavaScript code minimizer
  • Large font sizes, much whitespace, large illustrative, but useless images, HD screen required to browse most websites
  • Lack of #government #regulation and #law #enforcement, too many malicious actors (#spam, #phishing, etc.)
  • Emotional content to increase #interaction, #clickbait

Once being an open platform geared towards information exchange and bringing people into contact, most of the public Internet today is nothing but annoying useless #marketing, #advertising and #data #collection. Providing information, connecting people, and making life convenient is definitely NOT the primary goal of whoever is big on the Internet today. It's shocking to see how much of it is only to sell you stuff or to sell your information.

And the worst is: we are even paying them to do this shit. #Marketing spending will be reflected in product prices, and with much of marketing being done in 1st world countries, a substantial amount of the price goes into this destructive industry.

I could go on with this for hours. Really sick of it.

hackbyte@friendica.utzer.de

MaxQ ABORT! - Blue Origin's New Shepard Has Fiery Engine Failure In Flight

MaxQ ABORT! - Blue Origin's New Shepard Has Fiery Engine Failure In Flight

https://youtu.be/DoRp7nRIOpo
https://redirect.invidious.io/DoRp7nRIOpo

tl;dr: Capsule separated with the emergency motor, got a nice quick speed/ascent boost into the thickest air which slowed it down rapidly for a more or less regular descent and recovery.... Booster is presumed lost somewhere in the desert, probably tumbling while coming down..

#Space #Flight #SpaceFlight #News #MaxQ #Abort #Blue #Origin #BlueOrigin #Scott #Manley #ScottManley #Failure in #Flight #NS23 #New #Shepard #BE-3 #Engine

olddog@diasp.org

Deltic
National Railway Museum
24.1K subscribers

Join Anthony Coulls for a full tour of King's Own Yorkshire Light Infantry (KOYLI), a superb example of the Deltic diesel locomotive that was the first worthy successor to the steam locomotives of the previous era.

The Class 55 used two Napier Deltic power units for a peak power output of 3,300hp, which made for a much sprightlier locomotive than earlier diesels—ideal for deployment on high-speed services.

Anthony takes you through the history of this legendary engine and shows you all of its design details inside and out, including a very useful feature behind a door inside the cab...

#Transport #Rail #Locomotive #Engine #Deltic #UK

utzer@social.yl.ms

I got a #technical or better an #electrical #question, when one needs to work on the #stator output of an emergency diesel with 2.4MVA, it is necessary to to fit grounding equipment and lock out all #energy sources. Lets say there is no space to connect the grounding equipment properly, would it be sufficient to lock out the starter of the diesel #engine and also lock out the excitation. Both measures ensure that the #machine can not be started and can not be excited.

canoodle@nerdpol.ch

Starship Super Heavy engine steering test

when? soon… very soon…

“On Black Friday, SpaceX CEO Elon Musk sent an anxious email to his company’s employees, urging them to work over the weekend on SpaceX’s Raptor engine line and describing the production situation as a “crisis.”” (to SpaceX) (src: theverge.com)

Starship Super Heavy engine steering test-2021-12-18

Starship Super Heavy engine steering test-2021-12-18

Starship Super Heavy engine steering test-2021-12-18

[video width=”486″ height=”482″ mp4=”https://dwaves.de/wp-content/uploads/2021/12/Starship-Super-Heavy-engine-steering-test-2021-12-18.mp4″\]\[/video\]

#linux #gnu #gnulinux #opensource #administration #sysops #space #starship #raptor #engine #spacex

Originally posted at: https://dwaves.de/2021/12/19/starship-super-heavy-engine-steering-test/

hackaday@xn--y9azesw6bu.xn--y9a3aq

Japanese Rocket Engine Explodes: Continuously and On Purpose

image

Image of detonation engine firing

Liquid-fuelled rocket engine design has largely followed a simple template since the development of the German V-2 rocket in the middle of World War 2. Propellant and oxidizer are mixed in a combustion chamber, creating a mixture of hot gases at high pressure that very much wish to leave out the back of the rocket, generating thrust.

However, the Japan Aerospace Exploration Agency (JAXA) has recently completed a successful test of a different type of rocket, known as a rotating detonation engine. The engine relies on an entirely different method of combustion, with the aim to produce more thrust from less fuel. We'll dive into how it works, and how the Japanese test bodes for the future of this technology.

Deflagration vs. Detonation

Humans love combusting fuels in order to do useful work. Thus far in our history, whether we look at steam engines, gasoline engines, or even rocket engines, all these technologies have had one thing in common: they all rely on fuel that burns in a deflagration. It's the easily controlled manner of slow combustion that we're all familiar with since we started sitting around campfires.

A diagram of the JAXA rotating detonation engine, showing the intended operation in which the shock wave from detonating fuel travels around the engine in the annular channel to continue the combustion cycle. Source: JAXA

However, there are potential efficiency gains to be had by combusting fuel in a detonation instead. This is where the combustion creates a shock wave that travels faster than the speed of sound that rapidly propagates the detonation reaction further, and comes with a huge pressure increase to boot. The key advantage of burning fuel in this manner is that there is more energy to be gained from that huge pressure increase. Thus, by releasing more energy from the same amount of fuel, engines operating on a detonation-based process could theoretically be more energy efficient.

There are several issues with operating an engine on a detonation-based cycle, however. It can be difficult to sustain a continuous detonation reaction. Additionally, large spikes in temperature and pressure from the detonation process and the associated shockwaves can easily damage or destroy parts made of even very tough materials. Thus far, engineers in many fields have struggled to tame and control detonation processes to the point where they can be used successfully.

The rotating detonation engine consists of a combustion chamber that has a annular, ring-type construction. In this ring, fuel and oxidizer is injected, and ignited in such a way to detonate the mixture. The aim is for the shockwave of this detonation to travel around the ring-shaped combustion chamber causing further detonations as it goes in a continuous cycle.

Getting the concept to work has proved difficult; despite the concept being first developed in the 1950s at the University of Michigan, it was only in recent years that engineers had successfully demonstrated a rotating detonation engine in continuous operation. A team at the University of Central Florida demonstrated a hydrogen-oxygen fueled engine in 2020, producing up to 200 lbf (890 N) of thrust in testing. The feat was achieved through careful tuning of the size of the jets that inject the propellants to get the mixture just right for controlled detonation to go on. Get the mixture wrong, and the fuel will burn in a slower deflagration, with no benefits to thrust or efficiency.

Japan's Live Test

Unlike the experiment by the University of Central Florida, the Japanese effort involved launching an actual rocket. The test used a standard sounding rocket with a conventional engine to launch the test payload hundreds of kilometers above the Earth, with the second stage of the rocket mounted the rotating detonation engine. The mission took place using sounding rocket S-520-31, launched from the JAXA Uchinoura Space Center on July 27, 2021.

The JAXA rotating detonation engine in operation over Earth. Source: Nagoya University, JAXA

The second stage fired successfully, running for six seconds and producing 112 lbf (500 N) of thrust during that period, 56% of the Florida team's ground demonstrator. Data collected from the experiment confirmed that the engine operated as expected, combusting its fuel in the detonation regime.

JAXA hopes to put the technology into practical applications within five years, given the successful demonstration of the flight hardware. Built in collaboration with a team from Nagoya University, the hope is to develop the technology further to create more efficient spacecraft in future. It could find application in a variety of areas, from first stage and second stage rocket motors, to being applied to deep space missions to make the most of limited fuel resources.

The technology has come a long way in the past few years. With multiple independent groups now demonstrating working engines, it's shaken the "impossible" title that had become attached to the rotating detonation concept for half a century. Obviously, much engineering will be required to build practical engines that outperform existing designs. However, with the recent strides made in the field, there's now a spark of hope that tells us it could be done.

#enginehacks #hackadaycolumns #science #aerospace #engine #rocket #rocketengine #rocketry #rotatingdetonationengine