powderpig

6 ms·

1.
by powderpig 4mo ago
The only benefit I've really made sense of with hybrids is their engine emissions aren't localised to the neighborhood where they're charged overnight. Apart from that, I can't think of anything else.
2.
by powderpig 2y ago
You should check out the Artemis I engineering footage.
3.
by powderpig 2y ago
Red Dragon? Falcon 9 Booster 24-hr turn around? The plethora of missed milestones required to land on the moon's surface?
4.
by powderpig 2y ago
Metro?
5.
by powderpig 2y ago
I'm only here for the free U2 album. "U2's latest album automatically added to your library"
6.
by powderpig 3y ago
Conventional jet engines run at RPMs in excess of 20000rpm. To get this same speeds for the same mass flown rates of say a J79 (F4-Phantom) you'd be looking at some massive electric motors. Conventional jet engines would be using elect
7.
by powderpig 3y ago
Virgin Orbit anyone?
8.
by powderpig 3y ago
Maintaining a pressure boundary becomes ever more difficult with increase in size, and therefore cost and engineering complexity.
9.
by powderpig 3y ago
Roughly how many hours did Euan spend to complete this piece of work?
10.
by powderpig 3y ago
Ever heard of ITAR? As a European I find the US's reluctance to adhere to EU law double standard.
11.
by powderpig 3y ago
I highly recommend AccuBattery for Android. I have been using it for a few years now and I saw a noticeable difference on my Pixel 3a XL compared to use on previous smart phones. I now have a Pixel 6 and its nearly 2-years old and the batte
12.
by powderpig 3y ago
How is China a problem? The way of life and the energy intensity of a single individual living in the developed world is the problem. Do I have to point out the US and Europe? (I live in the UK).
13.
by powderpig 3y ago
This is essentially the Boots Theory, coined my Terry Pratchett. The reason that the rich were so rich, Vimes reasoned, was because they managed to spend less money. Take boots, for example. ... A man who could afford fifty dollars had a p
14.
by powderpig 3y ago
When's a good time to stop technology advancement for those of us who are willing to pay for it? There will never be a right time.
15.
by powderpig 3y ago
There are a number of reasons why it might have failed, fatigue, deviation from process/protocol but pressure vessels are well understood and not the problem here.
16.
by powderpig 3y ago
The "space" launch was using American technology, nothing about the failure was "British", in my mind. Volt on the other hand...
17.
by powderpig 4y ago
Worth noting the use of titanium at Mach 3, Mach 3.5, is really at its limit. Any faster and you'll start to see serious problems with thermal management. This pushes you into using super nickel alloys or even ceramic matrix composites
18.
Roles you may have to affect climate change(newscientist.com)
2 points by powderpig 5y ago|0 comments
19.
by powderpig 5y ago
And I think this is one of the reasons we are seeing so many companies racing to create a commercially viable eVTOL (electric - vertical take-off & landing) product. To me, this transport system only seems to be a solution to the proble
20.
by powderpig 5y ago
Like the Russians?
21.
by powderpig 5y ago
> Is electricity so expensive in some countries that burning fossil fuel for heat is cheaper than using an electrical heat pump? Yes. I can't remember the exact source but this charity covers it well. Up to 30% of Africa still burns
22.
by powderpig 5y ago
I think all geo-engineering is a bad idea. The least worse idea is sucking CO2 out of the atmosphere. The consequences of any geo-engineering ideas are not well understood.
23.
by powderpig 5y ago
I too hate the coloured plots but I can tell you as a Stress & Structures engineer who works with ANSYS regularly, it does help when assessing material limits and strain energies. This is especially true when you're working with mo
24.
53% of the area of 9 western states is in extreme or exceptional drought(twitter.com)
4 points by powderpig 5y ago|0 comments
25.
by powderpig 5y ago
I am afraid I don't have the numbers to back up my claim but when I was at university, my thermodynamics lecturer showed us a calculation that background dose from radioactive material at a coal powered fire station is higher than that
26.
Workplace Wellbeing Is a Scam?(tribunemag.co.uk)
219 points by powderpig 5y ago|225 comments
27.
by powderpig 5y ago
I'd imagine the most complex engine ever to use the full flow staged combustion cycle has a large price tag.
28.
by powderpig 5y ago
> I can't see this ever being approved for human flight without major seeing changes. ...major design changes.
29.
by powderpig 5y ago
I cannot believe that Spacex are planning to eventually make Starship human rated and yet there still won't be a launch escape system. I can't see this ever being approved for human flight without major seeing changes. Even if the
30.
by powderpig 5y ago
Lithium-ion fires are hard to extinguish, especially with thermal runaways. There are flame retardant products that can extinguish lithium-ion fires, Class D extinguishers can be used. I would guess the fire crews that responded were not eq

More ›