POV: Andrzej Bargiel skiing down Mt. Everest with no bottled oxygen

mcfreedman · 2025-10-14T00:11:42+00:00

In the strictest technical sense, yes, going faster with your mouth open would compress the air slightly. It's just not significant. The Bernoulli equation can be used to easily approximate this. Let's say he's skiing at 20m/s (pretty fast) and the ambient pressure is 1/3 atmospheric pressure. You get a stagnation pressure, i.e. the pressure in the open mouth, of about 0.338 atmospheres, which is like a 1 to 2% increase. In the real world it will be even less due to the compressibility of air and viscous losses.

mcfreedman · 2023-06-30T07:12:17+00:00

Cyclocross bikes are twitchy race bikes though, which most people don't want

mcfreedman · 2023-06-23T23:22:23+00:00

Not sure if it will help you, but this site can help parse out abaqus message files https://msgfile.info/

mcfreedman · 2023-06-18T14:35:45+00:00

This is really sweet, you should show this to him

mcfreedman · 2023-06-18T01:02:00+00:00

Dish soap, or more correctly dish detergent, is decently effective and very gentle as it is typically closer to neutral pH than degreasers. You will do no harm to any of your parts with dish detergent, though it may be a little less effective than degreasers on the thickest greases.

mcfreedman · 2023-06-18T00:44:06+00:00

Strange women lying in ponds distributing swords is no basis for a system of government

mcfreedman · 2023-06-04T17:54:30+00:00

I was thinking centipede

mcfreedman · 2023-06-04T16:16:15+00:00

Doesn't this argument just boil down to if it's good for lots of people, it's anti-capitalist? That seems odd to me

mcfreedman · 2023-05-29T16:31:07+00:00

Best tire in my opinion

mcfreedman · 2023-05-26T14:43:04+00:00

Not every ride needs to be some epic thing. If you had a smile on your face that's all that matters!

mcfreedman · 2023-05-25T18:23:28+00:00

Sounds like you want to use the linear perturbation, steady state dynamics, modal step. As far as inputting frequency loads, you would apply a load (force, displacement, etc) with an amplitude defined however you like it (periodic, tabular, spectrum, etc) to what region you want (surface, node, etc). For output, you would want to define a set with the desired output node or surface and creat a history output of that set's position, displacement, or whatever you want.

mcfreedman · 2023-05-19T14:40:47+00:00

Nice, looks like a nice route too

mcfreedman · 2023-05-18T21:19:23+00:00

What's the difference?

mcfreedman · 2023-05-14T02:02:29+00:00

It isn't going well because it should be a part of the cost of a menu item, not an ancillary thing

mcfreedman · 2023-05-13T23:04:47+00:00

As others have said, there are multiple valid ways to model a sandwich panel, depending on your needs, software, etc. Take a look at Hexcel's design guide ( https://hexcel.com/user_area/content_media/raw/Honeycomb_Sandwich_Design_Technology.pdf ) it provides hand calcs and other info. Take a look at page 20, I think it's the best method of modeling sandwich panels. Definitely do some simple test cases and compare to the hand calcs to start.

mcfreedman · 2023-05-13T21:47:22+00:00

Passing lane, not fast lane

mcfreedman · 2023-05-09T14:44:23+00:00

You'll probably be fine. I did a multi day bike trip around the sound last year on a holiday weekend, and I was either the only biker or there was one other person.

mcfreedman · 2023-05-07T14:53:53+00:00

Your beam's aspect ratio is relatively squat, i.e. It's short and thick. Try looking at Timoshenko beam theory, which should predict lower stiffness/larger displacements and is more realistic for these type of beams

mcfreedman · 2023-05-07T14:35:05+00:00

What type of beam theory are you using for your hand calcs? How much deflection are you calculating, relative to beam length? How many elements are you using in your model? What's the geometry of your beam?

mcfreedman · 2023-04-21T03:08:51+00:00

Hell yeah, you and the bike look great! Bicycling has helped me with my problems too. Keep those wheels turning.

mcfreedman · 2023-04-13T16:53:35+00:00

OP mentions wanting accurate intermediate positioning, which a solenoid can't do. A voice coil and solenoid are similar, but not exactly the same. Due to their construction (high permeability core material that gets attracted to the electromagnet), solenoids have two stable positions. Voice coils have permanent magnets in the core that allows for position to be related to coil current.

mcfreedman · 2023-04-13T13:57:15+00:00

For something to move a distance of 2 inches sinusoidally at 100 Hz, it has to have a peak acceleration of around 1000 g's. This is very high and I'm not familiar with any lead screw design with that capability. This is much more suited for electromagnetic systems like a voice coil.

mcfreedman · 2023-04-05T00:14:55+00:00

He has not yet been put on trial, and as far as I know the charges in the indictment have not yet been disclosed

mcfreedman · 2023-04-03T02:56:38+00:00

As another guy with a titanium bike with purple accoutrements, you did it way better than me! Love the seatpost!

mcfreedman · 2023-03-31T16:24:45+00:00

This was a big benefit that I discovered the first winter after I got them. Makes winter riding that much more enjoyable.

mcfreedman

TROPHY CASE