zksmk

joined 2 years ago
MODERATOR OF
[–] zksmk@slrpnk.net 1 points 5 months ago (1 children)

Have you been following any of the discussions regarding potential issues with the administration and moderation on ml?

Can't say I have.

However, I originally made this community back in the day when lemmy.ml was basically the only instance, and have since then moved my account to another instance (2 years ago) specifically for those same reasons of lemmy.ml being... hmm.. politically charged.

I didn't think of moving the community until now tbh, but that's not really something I can do. At most I could sticky a link to another community, or delete this one (which would be overkill imo), but for that to happen there needs to be a different community to begin with and community interest for it to happen. The power's all yours people. It's up to you guys to show interest and initiative. Maybe make a post about this, and check if there's interest, discuss where to move etc, a meta post like this is totally fine here on /c/freecad.

Anyway, on a completely unrelated note, the community image did update after awhile, but in the wrong direction! It was the new logo on slrpnk.net/c/freecad@lemmy.ml for awhile, where my account is, but now I see that when the things synced the old lemmy.ml/c/freecad image overwrote the new one on slrpnk.net/c/freecad@lemmy.ml! I guess I can't change the image as a mod from another instance. I will have to mod my old lemmy.ml account here now to change the image (and hopefully it will stick this time around, assuming it works at all) but I will have to make a bug report on github about this when I find the time.

Sorry for the late reply tho.

[–] zksmk@slrpnk.net 11 points 5 months ago (3 children)

Done. It should take a while to propagate to every instance.

Keep in mind tho, this is an unofficial community.

[–] zksmk@slrpnk.net 2 points 11 months ago

I think you'd be better off using the Boolean XOR tool from the same Split submenu (if you approach it from the Part menubar in the Part workbench), on your cube and your array, instead of the Slice apart tool.

Then on the resultant XOR object use the Explode compound tool from the Compound submenu.

You'll get a folder with all your sliced parts in it.

[–] zksmk@slrpnk.net 1 points 1 year ago

I am. :)

Most of the subscribers here are new as well since the recent reddit exodus, I'd say that makes them active.

 

Thoughts?

[–] zksmk@slrpnk.net 3 points 2 years ago* (last edited 2 years ago)

Indeed. However, they are also very slow (usually around 30 km/h) and more importantly very slow to change that speed (cargo ships starts braking 5-10 km before port). The ships' engines aren't doing a ton of work themselves either, per unit of time.

Work per time is power in physics. A ship like this has an engine of about 100 000 horse power per google, which is about 400 cars' worth of power. And 10th of that is about 40 cars. Which matches thereabouts a huge sail in a strong wind at large altitude in the open ocean like this, I think. Back of the envelope math checks out.

 

A conventional ship with an easily deployable and retractable kite sail system burns less fuel than one without it. It's a type of hybrid vehicle, that has two propulsion methods, the main reliable one, and the supplementary one, for fuel efficiency. With the system installed and the kite in use, the ship saves an estimated 15% of fuel. However:

"There's a structural problem slowing down the process: ship owners (who have to make the investment) often don't pay for the fuel – that's the charterer's duty. The charterer on the other side doesn't charter the ship for long enough a period to make installing low-carbon, but potentially expensive, untested technologies pay back."

The lack of carbon emissions regulations for shipping and low fuel prices have added to these difficulties. The shipping industry is responsible for around 940 million tonnes of CO2 annually, which is about 2.5% of the world's total CO2 emissions.

A company behind these (SkySails GmbH), while technically successful at cutting shipping costs and carbon emissions, has faced economic difficulties. Since then, the company (reborn as SkySails Group GmbH) has switched to land-based airborne wind energy systems for electricity production from high-altitude winds.

What do you think? Yay or nay? Is this technology dead in the water? Not worth the effort? Will we see ships like these in the near or distant future? What needs to change?

Some good reads:

http://www.vos.noaa.gov/MWL/apr_09/skysails.shtml

https://rctom.hbs.org/submission/lets-go-fly-a-kite-skysails-and-climate-change/

 

Instructions are in the this ticket: https://github.com/dracula/freecad/iss...