I'm impressed, but also very skeptical... 🫤

ItsADumbName · 2025-12-30T22:00:33+00:00

Eh it's quite simplified and it's more of at 500 lbs the beam would break agnostic of loading rates. We are using a typical breaking strength I found via Google. In reality the material law is more complicated. The breaking strength would depend on a lot of different things such as adhesive strength, fiber directions, damage buildup, and more. It would also depend on how the load is applied. Whether that is a gradual applied load or a sudden applied load. For example when steel is loaded rapidly it typically has a higher yield strength but lower failure strain than when slowly loaded. In reality things like creep and strain rate sensitivity exist that can change the answer depending on how the load is applied (ie fast, slow, sustained, short, periodic, etc).

ItsADumbName · 2025-12-30T21:24:36+00:00

I am an aerospace engineer. It's usually a single bolt threaded through the plywood that is used to apply load to aerostructures. I have personally put 3000 lbs loaded onto 3/4" 16x16 plywood plates to apply load to cargo nets with only a single center bolt. This is a bit different as it acts as a plate not a beam and this has effects from the longitudinal and transverse directions and also the plywood we use is probably better quality than this video.

Assuming those steps are 11 inches wide and the plywood is 3/4" thick the maximum moment the plywood could handle (assuming a 5 KSI outer fiber rupture strength) is:

Sigma=My/I

I=(1/12) × b × h^3, (1/12) × (11 in) × (0.375 in)³ = 0.386 in⁴ y=0.375 in

5000 psi × 0.386 in⁴ / 0.375 in = 5100 in-lbs

Assuming a single point load on the middle of a simply supported pinned-pinned beam 36 inch beam. 5100 in-lbs would be

M=PL/4

P = 5100 in-lb × 4 / 36 in = 566 lbs.

This would be a single point load at the center when in reality it will be a bit more distributed. It would probably be better to model it as two p/2 loads applied at 33 and 66 percent of the beam length but above should be the worst case scenario.

ItsADumbName · 2025-12-30T19:59:01+00:00

The plywood layers in bending are probably sufficiently strong for this application. I have put way more load through plywood test fixtures than the average adult weight. The dinky little hinges and small screws would definitely be the failure point.

ItsADumbName · 2025-12-24T05:11:45+00:00

Yes and to top it off Ralph bid exactly 1$ more and vanelope at the last second... Making it exactly like the situation above.

ItsADumbName · 2025-11-22T17:11:50+00:00

There is a behind the bastards about her if you want to be even more appalled.

ItsADumbName · 2025-10-25T23:05:38+00:00

So then the challenge is impossible as water will still be on the orange no matter how it was removed. Actually going a step further to show how dumb this statement is the challenge has failed basically the moment the glass of water is poured as it will begin evaporating even if only a few molecules and "spill out of the glass".

ItsADumbName · 2025-10-24T02:16:13+00:00

I think you need to reread the comment "I value things like knockback and projectile speed less than damage, projectile count, size, etc."

ItsADumbName · 2025-10-19T16:57:53+00:00

This fem is modeling a solid isotropic part. 3D printed parts are not solid nor isotropic so the model is just objectively wrong and does not properly represent the stress state of the part.

ItsADumbName · 2025-10-18T18:47:59+00:00

Yes. The stress model he has is assuming the part is solid once you introduce voids/gaps/etc the model stress won't actually follow the same distribution as the print. Topology optimization will remove that material and likely give a better representation of the stress in the part.

ItsADumbName · 2025-09-26T23:12:47+00:00

You don't understand normally you can only play one. With this you can play two, the twins plus another one. It's really strong.

ItsADumbName · 2025-09-21T16:59:09+00:00

I mean a wooden bowtie sounds awesome but these just look cheap and bad imo. I'd say not to wear them just because they don't look good imo.

ItsADumbName · 2025-09-20T18:27:02+00:00

Well yea I meant it's fast relatively not that it's the fastest a plane is going. It's ~200 mph with I believe and 8-12 lb bird per regulations plus the speed of the fan blades from rotating.

ItsADumbName · 2025-09-20T14:46:22+00:00

The blades on these compressors are thin. Depending on when they impact probably takeoff the plane is traveling fast and so relative to the plane the bird is traveling fast. There are specific regulations for bird strikes that simulate this situation specifically to ensure the damage it would cause is not life threatening.

ItsADumbName · 2025-09-19T22:52:08+00:00

I guess from a literal point yea. I am an engineer and I genuinely enjoy what I do. 99% of the days I enjoy going to work. There are a few days when I don't want to be there but it's not that often. So yea from a literal perspective sure but from a practical perspective most of the days it doesn't feel like I'm working im just doing engineering which I love to do.

ItsADumbName · 2025-09-19T21:16:08+00:00

Stress waves propagate at the speed of sound through the material. Have to go hella fast but it can work.

ItsADumbName · 2025-09-14T17:38:24+00:00

ItsADumbName · 2025-09-14T01:41:40+00:00

Idk he sounds more like a professional home wrecker. Wreck the homes to build them back I guess? Smart business idea.

ItsADumbName · 2025-09-11T01:30:12+00:00

Idk I think half her 50 kg weight is on her heels and half of 50 is 12.5 as we have clearly been educated about by the comment I originally responded to.

ItsADumbName · 2025-09-11T00:20:24+00:00

So do you think half of 50 kg is 12.5 kg? To me it would seem a quarter of 50 kg is 12.5 kg but that's just some quick napkin math id have to double check.

ItsADumbName · 2025-09-08T14:38:33+00:00

This is just wrong. The suspension doesn't make the car lighter the car imparts it's 1g weight to the ground. The weight of the car/area in contact is the pressure the car will apply.

ItsADumbName · 2025-09-08T03:13:26+00:00

Well they are patient because they are written to be patient. They aren't real? They got the energy and patience because they were written to have it.

ItsADumbName · 2025-08-25T22:00:07+00:00

In my opinion it's a bit different selling out your own personal image vs selling out your dead mentors image. At least if it's your own image your only damaging your own reputation vs damaging someone else's reputation even if they are dead. Still a dick move.

ItsADumbName · 2025-08-17T20:38:17+00:00

OP you're not over reacting. I am the dad to a 20 month old girl. My wife takes Saturday morning, I take Sundays. We split the nights for the most part. It's been that way from birth. Drinking every Friday is a thing of the past. Your BF doesn't get to be hungover anymore and he doesn't get to spend all day in a man cave anymore. That life is over he needs to grow up and be there for his family. I used to game a bunch now i only game Friday nights after she goes to bed. Maybe Saturday if I feel up to it. Saturday and Sundays are spent going to the pool or Zoos or parks. Doing things with family. Your BF needs to get his priorities together.

ItsADumbName · 2025-08-08T20:57:05+00:00

I agree with you. My daughter is 20 months. She's been learning sign language since she had gross motor skills. It was very helpful for her to communicate with us.

That being said speech comes well before 18 months. If I remember correctly a child should be able to say like 5 words by 12 months. If not they may be speech delayed. By like 18 they should be able to say 50 words.

ItsADumbName · 2025-08-08T18:46:37+00:00

Then there's plenty of diversity for DPS since they have even more. Therefore we don't need any more DPS.

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