We used these old Gap-filler UHF birds in the 70's. I once managed the transponders for our fleet of ships. They made them to last back then. The old Gap-filler UHF birds had open transponders (raw bandwidth) that would take any signal from Morse to PSK low- complexity constellations for data.

 

Ran across this very interesting and informative video.

 

Nature has a handle on cool things:

 

How did this thing NOT fall out of the sky with that turn???

 

Maybe not the coolest thing you've ever seen - but it IS enjoyable.

 

How did this thing NOT fall out of the sky with that turn???

The judicious application of prodigious amount of thrust.

Notice how the plane is angled upward, giving the thrust a downward component.

 

 

Those chicks are almost ready to leave the nest.
https://www.youtube.com/live/B4-L2nfGcuE?si=D0LekBSI3taa6UuI

 

Digging into more old boxes of junk. Found this old coin that likely came from a Beer Garden in Thailand because it was with some other stuff. Don't remember exactly why I have it, but the faded memory is there.



https://en.numista.com/catalogue/pieces743.html
I've never been to Austria but I have worked with people from the area long ago.

 

Hi,
Austrian schilling.
E

 

Hi,
Austrian schilling.
E
View attachment 347981

It's odd the things you have that slowly bring back memories, the problem is, you don't really know if they are false sometimes. I'm pretty sure it was nothing special when I received it. I seem to remember they worked for the UN at the camp on the border.

 

 

 

That guy is always interesting and he has an understanding lacking by many other YouTube science vloggers.

 

That guy is always interesting and he has an understanding lacking by many other YouTube science vloggers.

Maybe it's because he has a real physics degree.
It was amazing the crap dished on him because of the electrical energy post he made a few years ago.

 

Maybe it's because he has a real physics degree.

Unlike this clown, to whom far too many kids get exposed:

It was amazing the crap dished on him because of the electrical energy post he made a few years ago.

Was that the video about the propagation speed of electrical energy through a giant loop of wire?

 

While I liked the video and it provided a nice, pretty intuitive, explanation of why the rotation about the intermediate axes flipped, it failed to show why that exact same mechanism didn't result in the rotations about the other two axes also flipping.

This was one of the most interesting exercises when I took Intermediate Mechanics as a physics major back in 1989 or 1990. The instructor made a point of not saying anything about the intermediate axis theorem when he took the textbook and, with rubber bands wrapped around it to keep it closed, thus making it a decent approximation of a uniform rectangular plate, proceeded to flip it about its two of its principle axis, the one with the maximum and the one with the minimum moments of inertia. No big surprise. He then had us calculate the moment of inertia of a uniform rectangular plate about these two axes, as well as the third one (the one he hadn't demonstrated). He surveyed the class asking if we expected the same nice, stable behavior if the book were spun around that intermediate axis and we all said that we did. He then had use calculate the stability of the rotation about each of those axes and we discovered that the extremes were stable but that the intermediate wasn't. Thus, we had a mathematical prediction of something that was completely counter-intuitive to how we all expected things to work in the real world, at which point he demonstrated that, indeed, you couldn't get that book to spin stably about its intermediate axis.

That really drove home the power of mathematical modeling.

 

 

Never knew this before!