mechhacker

Yup, that's the speed. It can be dangerous. During races they are required to wear impact vests and helmets.

Another innovation is a new kind of harness for the connection to the sail that releases above a certain force. A lot of the injuries are related to still being attached to the sail and being thrown into it during the crash, where you hit the hard carbon boom or mast instead of being flung clear into the water. That harness prevents that kind of catapult.

Hydrofoils have been exploding in popularity in watersports. It used to be seen as a thing to do on light wind days, because it lets you go faster than the board usually limits you if you can't get hydroplaning. Hydroplaning takes a lot more wind power than hydrofoiling.

But, they've been pushing the windsurf gear to 40kts on hydrofoils. That's without adjustable control surfaces like these boats, just steering with body weight and sail trim. I personally have gone 23kts or so and it feels much much faster than when you're on a fin, and you are constantly moving your weight to keep from slapping the water or getting too high for the foil then crashing.

I personally haven't had much of a problem other than where I now live doesn't have the best service indoors.

Another thing that I really liked was when I was traveling in Europe, I had free basic internet and texts. This was NOT the case with when I had Verizon. They just send you a text when they detect you there, tell you what is free and what costs extra, and you can use your phone like normal.

I even got a local esim with them when I was in Europe more long term (it was surprisingly cheap to get a dedicated European line). I originally got a phone that could handle a physical sim and additional esims for this reason.

Don't know much about the company other than that.

I use a different free app for forecasts, and it typically catches thermal winds like sea breezes with the default model. I still get skunked every now and then and show up at the beach with a board and not enough wind to go fast...

I was always inclined to spend it something like this if I had it: https://en.wikipedia.org/wiki/Kermit_Weeks

And BMI says nothing of body fat percentage

Can have higher BMI and lower bodyfat

I'm not convinced BMI is a useful metric

This is true for a lot of mechanical devices.

For example, turning engines on and off heavily thermally cycles them. It can get worse when they are rapidly cooled or rapidly heated. Jet engines running at constant speed have high cycle fatigue to worry about, but steady temperatures don't pose a thermal stress issue.

But shutting the engine off in cold air and letting them go from very hot to very cold suddenly will cause the thicker parts to cool slower than the thin parts, stressing them near the change in thickness. That results in low cycle fatigue (where you can count the cycles to failure in the dozens/hundreds/thousands vs. millions/billions for high cycle fatigue).

I remember playing around with this. Went and looked at my private repo and it was ~6 years ago.

Interesting idea, since I was enjoying Phoenix and Elixir. However, I jumped too quick I think into making a Rust NIF and it made the whole thing quite complicated. I was finding chasing down errors in multiple domains (Rust->Elixir->JS and back) to be challenging. I learned a ton on that project, however.

I wonder if it would go smoother now due to advancements with Phoenix and less javascript involved. I think some of the Rust libraries I was using have now advanced more as well.

Having to go back to the office would now require me moving 3000 miles across the country, to a place that made me depressed every winter. To a place that had some of the most restrictive policies the last few years. And to a spot that has housing costs even higher and worse.

No thanks, I'd rather take contract work or figure out something else.

Thank you. Man, that explains a lot of my easy to sleep but wake up early in the morning issues.

The entrance fee to America's online news articles keeps rising

Is photoshop absolutely necessary?

Krita is a great tool and works with a lot of the graphics tablets on the market (not sure about the ones with a display but maybe?), and I was using it on Linux many years ago.

https://krita.org/

I didn't even know that they didn't have a good explanation related to magnets, as invar for example has a curie point, above which it loses it's neutral thermal expansion properties.

I've seen it used for low temp things or tooling but for that reason it can't be used for anything really high temperature.

If you look down you also see how far away the ground is.

Always find myself subconsciously wondering how to react if the bridge/plane somehow separate.

Would be interesting to me to have something like this, but in landscape mode, and with slowly changing blueprints of aircraft, rockets, ships, cars...

Example: https://www.thesr71blackbird.com/Portals/14/EasyGalleryImage...

Evernote lost me when they changed the UI and made it take 5 taps/clicks to do what took 1 before. Was happy paying for it until then.

Now apple notes has replaced it. I tried obsidian as well but like notes better

No. Subs are different from scuba. They are kept at atmospheric pressure.

For scuba, you are breathing pressurized gasses much higher than 1atm at depth, which causes decompression issues.

If the bond failed before the tube, then it would probably just leak like they did earlier in the video. The high velocity/high deformation collapse inward would probably cause any bond line or the fibers in that proximity to fail anyway?

It's a good thing that they had dissolvable weight releases but I'm still amazed at the lack of backup systems and still letting passengers onboard.

Related to this, the Hydraulic Press channel did a somewhat similar implosion test of a composite tube with metallic ends. Thought it was relevant due to other discussion on this topic:

https://www.youtube.com/watch?v=BQGDwE3yMb0

Yes I don't think it gets to the same depth. They used an off the shelf tube (presumably then getting consistent layup/quality), which gave it a definite thickness and diameter.

There are nondimensional structural similarity parameters that could be used as well, which I don't think they did, but those are used for subscale structural modeling for things like buckling. Sometimes substitute materials are used as well to get the right structural parameter.

Kind of like Reynold's number for fluid flow but for structures. It's been a while since I studied that aspect and can't remember off the top of my head.

I'd like to see the Ti failure too. He did cast a Ti sub replica a few months back and it flattened to a banana: https://www.youtube.com/watch?v=8tW4zfTeJqM

This is a video by the hydraulic press channel which uses a scaled, very similar geometry to the Titan submarine which unfortunately failed recently.

They explain some of the details here, and show high speed footage of what happens when the tube fails.

It took over a year of mandatory 2fa w/ phone app before they stopped making us change our password every month.

At least my password isn't changing anymore but I never understood that policy if you made a strong password. It was overkill.

Some websites still require it though, and that's nonsensical and annoying. Just randomly generate one and keep it in a password manager.

In a similar situation/location. But can't access it through my home internet, but my phone is just fine if I turn off wifi. This is funny because I was still getting push notifications, I just couldn't read them with my phone connected to the home router.

They've been brilliant otherwise. Able to import everything from gmail very easily.

Really happy with my Fenix as well. It's only crashed once when recording where it lost data (3+ hour long GPS session), but other than that I haven't really had serious issues. I will force a reboot occasionally but the user experience is so much better than the Samsung watch I tried.

And battery life...I can put it in low power mode and it just works as a watch until I want to record an activity. And it has power for ~a month that way.

I just saw this: https://www.youtube.com/watch?v=uP4SrLhUHY8

Those tarps may be covering what's left of the crew

Interesting that the overall concept of the Trieste is very similar to the Limiting Factor.

The main difference being instead of using gasoline as bouyancy, they use syntactic foam. It seems like that made the overall vessel smaller. But the fundamentals of the pressure vessel is very similar, with modern tech wrapped around inside and outside. And LF using Ti vs. the Trieste's Steel vessel.

https://lynceans.org/tag/syntactic-foam/

Worth noting that because he's using a hydraulic press, the load isn't constant.

It deforms, fibers break, and thus the load decreases as the deflection stays relatively constant in that time frame.

With external pressure the load doesn't decrease. Fibers break -> deflection increases -> more fibers break. There isn't load relief as long as the vessel is still holding pressure.

There are non-trivial differences in designing vessels loaded with compression vs. tension, and the most experience we have is with internal pressure (e.g. tension).

The analysis is very nonlinear and unfortunately not as widely understood as internally pressurized vessels. It requires a lot more analysis, troubleshooting, and expertise that is short in supply.

Add the additional catastrophic failure modes for composites and there's a reason that industry experts warned against this.

I see. Thus that large Ti flange that was bonded to the dome didn't carry a load through the bolts significant enough to deform the dome either. Carbon gone in a flash and comes apart at that joint totally, Ti is left hanging in water.

I'll speculate that because they are pulling pieces of the Ti domes without signs of carbon attached to it that the joint there wasn't stiff enough, and that carbon separated during failure without plastically deforming the Ti at the joint.

But, that's speculation and I'd need to see more pics with more details.