Recent content by jrmichler

The 7200 volt distribution line past my house has steel conductors without insulation. We had a big storm last year that closed the road in nine places around my house. I had a good look at the downed lines while helping the town road crew chainsaw trees. The wires did not break in one place...

Beginning mile 2 of my 4 mile morning run yesterday. Calm wind and comfortable at -7 deg F. The next 10 miles down this road are all public land.

My jobs have been mostly analyst, problem solver, mentoring young engineers, and project engineering. I have used MATLAB extensively. I have looked at other packages, but ended not using any of them. My actual calculations were mostly algebra and trigonometry, with some calculus. I have...

I used search terms 5052 aluminum annealing temperature, and got several good results. Some of the confusion might be due to the way that it starts to soften at 500 deg F, but needs 650 deg F to anneal. That's why some sites mention hot working at temperatures above 500 deg F, and annealing at...

Mine did it twice yesterday, but only twice. And not on this thread. Chrome, Windows 10.

I got the same, then cut and pasted just the https://www.pv-magazine-australia.com portion of the link. I clicked on the article, and cut and pasted the link of the article: https://www.pv-magazine-australia.com/2025/12/01/synchronous-condensers-to-play-key-role-in-system-security-says-aemo/...

The paper linked in Post #4 is a good discussion of bolted joints for a person with a background in the subject. It's not so good to learn about bolted joints. Search terms theory of bolted joints found this good hit: https://www.boltscience.com/pages/basics1.htm. The Wikipedia article at...

Windows 10 and Chrome.

And me. I am unable to scroll up using the scroll wheel, but only on some threads. Scrolling down always works. Scroll wheel works properly elsewhere. The problem started a week or two ago.

Stopped to talk to a neighbor while on my morning run last July, and the Google Street View camera car went by. The strange thing is that the Street View car went by two years ago while I was actually running. They posted that imagery for about three months. Then they replaced it with older...

You might want to familiarize yourself with the Federal Aviation Regulations (FAR's). From 14 CFR Part 1: Rocket means an aircraft propelled by ejected expanding gases generated in the engine from self-contained propellants and not dependent on the intake of outside substances. It includes...

There is no simple math to calculate power requirements for this system, but it should be possible to make a rough estimate. My approach is to start with some simple assumptions, then build on the results. 1) Assume enough forward speed that each paddle gets a full bite. 2) Assume that exactly...

Hand calculating this problem takes several steps. Here is how I would do it. 1) The thin parts are doing all of the deflecting, so start by eliminating the solid blocks. The two thin beams are combined into one. 2) The bottom of the resulting beam is fixed. The top is subject to a force...

You do not tell us what your analysis is trying to find out. Are you looking for deflection, deflected shape, strain, stress, or what? What are the assumptions in your hand calculations? How and where do your hand calculations differ from the FEA? Please discuss in full detail. Your...

There is an optimal shape for least drag for a given frontal area. There is an optimal shape for least drag for a given interior volume. They are not the same. They change with Reynolds number and Mach number. All of which ignores practical realities. Fluid-Dynamic Drag, by Hoerner has a whole...