mechhacker

12 ms·

91.
by mechhacker 3y ago
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
92.
by mechhacker 3y ago
Not surprising that the Titanium parts are coming out what looks like whole. No sign of the composite cylinder in those pictures.
93.
by mechhacker 3y ago
I saw bits and pieces of this interacting with DERs when I was working in the field, and you're touching on what I saw first hand. Thankfully I wasn't working on anything related to the MAX.
94.
by mechhacker 3y ago
Yep. They were trying to compensate for different feel/behavior to the pilots without additional training. I really don't see how that was approved by a competent agency... Ended up in those two horrible crashes in perfectly good
95.
by mechhacker 3y ago
When I found out about MAX and what happened with the design, after leaving that industry, I was amazed it had gotten approved. That number there indicates that.
96.
by mechhacker 3y ago
Yep I think there's plenty of growth/shrinkage creaking from small gaps opening and closing and from structures sliding around on normal metallic subs. But, I bet this sounded different and more terrifying, and was fibers/mat
97.
by mechhacker 3y ago
Saw this today. https://www.youtube.com/watch?v=0mSq6ibKKXQ
98.
by mechhacker 3y ago
Very interesting. Ties sub tech to Steve Fossett, who was working with Scaled Composites before his death. Not saying they are related at all but I am reminded of this: https://en.wikipedia.org/wiki/VSS_Enterprise_crash
99.
by mechhacker 3y ago
Thanks, I see now. Wow, that's a thick layup.
100.
by mechhacker 3y ago
I'd really like more detail on that tube's layup schedule. Solid 5inch thick carbon composite OR a sandwich design with thick outer facesheets of carbon fiber? I suppose under that pressure not much would take the hydrostatic load
101.
by mechhacker 3y ago
Could mean a lot of things Could be a pop of the hull that then flooded the inside almost immediately. Would like to see failure tests of how these kinds of hulls fail. Other subs that failed with other hull designs were pretty gruesome, li
102.
by mechhacker 3y ago
You can do that but you'll spend a lot of money breaking things. If you're in a non-safety critical field then that is a possibility. But, you really need good engineers, or to make them through these mistakes, to figure out what
103.
by mechhacker 3y ago
I've had some work in designing vessels to take external pressure. It's fundamentally a nonlinear problem. A lot of new(and some not so new) engineers don't understand the process of solving it properly For instance, euler bu
104.
by mechhacker 4y ago
One thing they don't seem to have mentioned was hydrofoils. It would be more for time critical shipments, but hydrofoils can greatly increase the speed of sailing vessels, but would need proper design for the sea state (such as routes
105.
by mechhacker 4y ago
Would like to see how it handles thermal cycles
106.
by mechhacker 4y ago
Helium is a more effective heat transfer medium with lower molecular weight. Hydrogen would be more efficient but it tends to cause issues with the containing material and leaks.
107.
by mechhacker 4y ago
I figured this would happen sooner or later. As someone who runs mechanical FEA when necessary, I know why some companies are reluctant to use this particular CAD/simulation package. A lot of industries have export restrictions, and no
108.
by mechhacker 4y ago
This is a very common engineering challenge, but I don't have experience with the specifics of rails. Roads (especially near bridges) have expansion joints so that the sections can expand and contract in hotter/colder weather. It
109.
by mechhacker 5y ago
Interesting. I'll give this a shot. I've been using Evernote for years but their recent "improvements" to mobile have made it incredibly slow and requiring 3x as many steps as before, and I can't stand it anymore.
110.
by mechhacker 5y ago
Yep I've been hydrofoil windsurfing (and have tried wingsurfing/wingfoiling as well). Hydrofoiling has extended the lower range of wind speeds that I can go fast in. For instance, around 10kts wind I can pump the board and sail to
111.
by mechhacker 6y ago
I recently picked up a foil board to go with my other windsurf gear, and the sail is absolutely a confounding effect I've read some on the subject, and got a book by a famous boat designer, Kotaro Horiuchi, which describes the actions
112.
by mechhacker 6y ago
What's your threshold for "putting others at risk"? Zero tolerance? One potential infection of a 300million+ population? One potential death of a 300million+ population?
113.
by mechhacker 6y ago
Really glad I got to drive out and watch this launch. It was fantastic seeing us send people back into space again.
114.
by mechhacker 6y ago
This wasn't a typical RTG. It had stirling engine and was a lot more efficient (made a lot more power per unit weight of Pu) than RTG. I don't think there was any way to save and restart anything if an engine failed as it would ha
115.
by mechhacker 6y ago
I'm less familiar with Kilopower but I spent a couple years working on something very similar that ran off of PU-238. Looks like Kilopower is U-235. Looking into this, it needs a simple control system. The PU-238 bricks just made heat
116.
by mechhacker 6y ago
I've been really happy with combining both Nebo and Evernote Nebo has great handwriting/math/schematic recognition and I can export as recognized text to Evernote. That way both the original handwriting and the text are store
117.
by mechhacker 7y ago
Glad you enjoyed it!
118.
by mechhacker 7y ago
I was there a few months back. If you go on the day-long Chernobyl tour from Kiev, they will take you into Pripyat as well as the Duga radar installation. It's a very interesting trip. I took some photos inside the radar control buildi
119.
by mechhacker 7y ago
Yup, bingo. Although every single thing, gears included, will have some deflection.
120.
by mechhacker 7y ago
It's also the elastic modulus of the gears. Every solid thing has some stiffness or measure of how much it compresses/stretches when it's loaded. There will be finite (but extremely small) compressive/tensile forces that

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