Search results for query: *

Generally, yes. Project 2025 was most definitely an effort involving a great deal of Trump allies. Trump has made a point to distance himself from that document after a few different bouts of public outrage over various parts of it. Seems to me that, generally, those on the right believe his...

Project 2025 proposes to completely dismantle NOAA and the NWS and privatize weather forecasting data. Whether or not you believe Trump plans to attempt to implement Project 2025 proposals probably depends on which of the two primary political narratives you subscribe to.

Fully agree. The only conclusion I can find (this is 100% conjecture) is the the 'loud bang' heard during dive 80 was assumed to not be a major problem because it didn't precisely match some 'ideal' sound signature they were looking for based on the test results from the 1/3rd scale tests to...

This is an interesting revelation. But it seems the next step for Rush et. al. was to just assume that since they had heard some noises from the scale hull prior to failure, they should just listen for those same noises in the full scale hull and everything would be fine unless they heard the...

I agree, that was one of the major failures. The real root cause in my estimation is something I see in junior engineers A LOT. His entire safety process was based on the idea that you can manufacture a critical component using edge-of-envelope techniques and materials, and end up with a...

There are three primary modes of failure for any adhesive joint: 1) Failure of the base bonded material. In this case, the adhesive itself does not fail; the base material(s) being bonded by the adhesive fail. This is easy to spot, as you wind up with one part having a perfect layer of...

For Gr 3 titanium in shear, that window is right on the money

There is much more evidence against adhesive failure as primary root cause that there is for it at the moment. None of the adhesive bond line faces documented thus far exhibit the signs of an adhesive failure in shear; all indicate failures in tension. Tension failure of the adhesive can't be...

@TugboatEng in addition to SWC's comments above - that's not 4 fibers cut; that's millions of cut fibers. Published docs show they were using roughly 133 layers per inch. Each layer is a wrap of whatever tow they used - that's an unknown, 18k or 24k tows that are 25mm or so wide would a typical...

That's a great way to make an already expensive process more expensive by a factor of probably at least 3. That also wouldn't solve the problem. Epoxy outgasses when it cures. Control of negative pressure on the parts is a critical aspect of making composite parts successfully. This isn't an...

Most definitely. That's why they changed to the multi-cure approach in the first place. The fabricator of the hull was definitely experienced in CFRP mandrel-wound fabrication, but I'm not sure they (or potentially, anyone on planet earth) were experienced in mandrel wound composite structures...

The 'V2' hull was wrapped and cured in stagess a direct response to the large amount of internal delamination/porosity seen in the first hulls constructed (both full scale and test) which were wrapped and cured in one go, using a wet layup. This decision is covered in other documents released...

If you're looking at oldcastle products.. call Oldcastle. They will be able to tell you what you can and cannot do to their products.

Not so fast... It's not nearly that simple. Any failure would result in water filling the passenger space at supersonic speeds - effectively a gigantic water hammer - which would be difficult to model and would break all sorts of things. The adhesive joint as initial failure point is certainly...

I have my doubts about that.. you would need to hold them together somehow. The first bathysphere ever constructed was a 1" thick steel casting, 5' diameter and cast in one piece. Even if the 'bathyspheres were multiple pieces with no seals between' thing is true, there's one factor that would...

Bonding titanium components is not ground breaking - it's very common in certain parts of the aerospace world - but getting a high quality, high strength adhesive bond to titanium parts is still a non-trivial process. You can't just buy a product off the shelf and slather it on and get good...

What is the point you are actually trying to make? That China is an example to be followed? My personal CO2 emissions statistic of choice is kg CO2 emitted per real dollar of GDP. I like this data point for two reasons: 1) it's a direct measure of how efficient a particular national economy...

Monthly check in to see if everyone in this waste of a thread is still firmly entrenched in their positions and talking past each other Yup. See y'all in October.

You need to use one of the Moes equations for a problem like this. They are available online, and they are intricate. There are also calculators out there which will spit out the Moes parameters and the actual final film thickness, such as...

Every time I've done big steel, the erection plan has been developed with significant participation from both the erector and the EOR. Granted, I've never done a PEMB on a scale this large. I've built a gigantic hangar, but it was not a PEMB. Several of the main span elements required...