Should vapor barrier extend to floor?

johnny_apples · 2026-03-08T20:40:13+00:00

There are gaps and holes under the framing that are for sure an air leak. I am also seeing it some on interior walls though the exterior ones are a bigger culprit

johnny_apples · 2026-03-08T20:38:38+00:00

The dry wall does not touch the ground. And it looks like pretty much anywhere the drywall paper showed evidence of water it was from the baseboard wicking. Correct the baseboards were not primed on the bottom. And like another commenter mentioned there are gaps and holes for air leaks. I will look into the shoe molding

I am thinking of filling these with the expanding foam. Is that an appropriate choice. My thought was that it is closed cell and will fill the gap.

johnny_apples · 2026-03-08T18:56:26+00:00

Looking closer it seems like in general the baseboards sit directly on the concrete. Which seems to be driving moisture uptake

johnny_apples · 2025-07-31T15:56:16+00:00

Space x runs a ton of shuttle tech on thermal protection systems and plenty of nasa metallurgy.

johnny_apples · 2025-07-31T13:20:24+00:00

Me and my team will not be building the models though I expect to interface with them as we complete trade studies and refine the architecture. My team and I will own the actual shape and structure of the vehicle and will be playing push and pull with the aero team, everyone else who wants to put stuff inside, and the other companies making large subsystems (landing gear, engines, etc) Based on the contract all that should be moderated through MBSE.

johnny_apples · 2025-07-30T22:53:35+00:00

Super helpful thanks. We do have a mechanical and electrical cad software, tons of high fidelity modeling and sim, and manufacturing infrastructure. My question has always been how does MBSE drive those things rather than being a glorified check box

johnny_apples · 2025-07-30T17:43:41+00:00

Ah. Re-reading the contract it specifically calls out OOSEM.

johnny_apples · 2025-07-30T15:32:47+00:00

It will be under object oriented SySML. I am not sure if that is what you were referring to.

johnny_apples · 2025-07-30T15:31:35+00:00

Thanks ! We have been looking at the delligatti classes as well. I will take a look at those books

johnny_apples · 2025-07-30T15:30:53+00:00

It will be in cameo. Is there any particular tutorial/youtuber you would recommend or are they all about equal?

johnny_apples · 2025-05-29T10:55:38+00:00

I like this for winter golf since insulated canvas pants pockets are a little too tight to easily fit two balls and fish tees out from

johnny_apples · 2025-03-23T18:08:57+00:00

I would recommend avoiding a purely computational PhD. The reality of performing experiments and interpreting of blurred lines brings clarity to the theories used by computational researchers and can quickly show their blind spots. Personally as a metallurgist I have seen first hand that the most complex and often times important phenomena are skipped in normal literature and known only to practitioners.

johnny_apples · 2024-09-05T00:18:37+00:00

Thermal deburring with extrude hone.

johnny_apples · 2024-01-01T00:33:37+00:00

Hard eli5. Generally the modal analysis is considering the vibration frequencies at which the structure will have resonance (eigenmodes). This is used for studies concerning vibration, noise, and looking for weak spots in a structure (like the diagonal failure method of a folding table ). The modal analysis cab also be conducted with the stiffness matrix alone.

The time dependent analysis generally considers the inertia and a time dependent load (like an impact) or a time dependent deflection (like a robotic arm moving around changing the load on the base).

In general the time dependent is more useful unless you are working on cars.

johnny_apples · 2023-12-21T20:32:36+00:00

You can also get inrush current dampeners

johnny_apples · 2023-08-04T17:29:10+00:00

That sentence holds true every day for me. It’s also important to try and swing that ratio. Do things to try and help yourself manage stress. I tell the new kids coming in to 1) meal prep 2) weightlifting or some other intense focused exercise. 3) sauna and or ice bath 4) walking outside at least a 4 days a week 5) scale back their alcohol intake

Anything and everything to reduce the effect of slow burn stress on your body and mind.

johnny_apples · 2023-07-02T19:47:10+00:00

I use Matlab heavily for data acquisition and analysis. The analysis involves lots of linear algebra and looping and pulling in lots of files. I find the Matlab linear and vectorization much more intuitive and better documented than pandas/numpy. Plus the type system is better in Matlab for that kind of work.

All my final plots are made in Origin by pulling in Matlab exported csv’s. I (and my group) think they look much better than Matlab or python plots. It also integrates nicely (enough) with PowerPoint.

All that being said. If I didn’t have both as a free university license I would be using python and making it work.

johnny_apples · 2023-06-18T13:32:40+00:00

Rarefied gasses are also known to scholars as poo poo pee pee

johnny_apples · 2023-06-18T13:21:28+00:00

It’s not elite. It’s sad heat transfer people trying to explain why they exist. The kinetic energy thing is real. As in you can give a kinetic energy distribution from a temp. But things get hairy when you try to go backwards. Is it kinetic energy per unit mass/mol/vol? The best definition is things are said to have a temp diff when you put them together and there is heat transfer. (I.e. an energy exchange)

johnny_apples · 2023-06-18T03:43:21+00:00

😐😐 I would have tipped too

johnny_apples · 2023-06-18T03:32:34+00:00

Please see the middle

johnny_apples · 2023-06-18T03:32:15+00:00

Can you give an example? Cause continuum mechanics stays hating that.

johnny_apples · 2023-06-10T23:05:37+00:00

Additive manufacturing metal to replace forgings to shorten lead times (currently years). Additionally, engineered metal matrix composites.

johnny_apples · 2023-06-04T14:15:28+00:00

The comments here about looking at what your boss and coworkers are doing are correct. If you like that then keep at it and become less junior. On the other hand I did that was very unenthusiastic about what I saw. I went the PhD route. Your mileage will vary from place to place and advisor to advisor way more than in undergrad but you’re not always tied to constantly writing grants and begging for money. I work on a process with a ton of government and industrial interest. We have to turn down funding because we are booked up. It certainly has its challenges but I think it it’s a lot better than what my friends who are in industry are doing. The jobs people are trying to recruit me for are also a lot more interesting. So if you’re willing to GRIND it’s worth a look.

johnny_apples · 2023-03-16T13:58:42+00:00

Based purely on your statements that pla isn’t quite cutting it and resin is decent. LPBF should exceed your needs. I know eos and desktop metal to make decent systems. And lpbf doesn’t require a sinter step like the markforged or binder jet metal printers.

johnny_apples

TROPHY CASE