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I'm going to try to do this every week.

I'm going to try to find something interesting to watch or read.

I'm going to try to open this thread every Sunday afternoon - and leave it open for the whole week as a stickied thread.

I can't be certain that I'll be able to keep this up forever, but I can get it started and maybe someone will take over for me. I'm also not sure what topics we'll be discussing.

This week, I've chosen a wonderful documentary called Building the SU-27 - The Best Fighter Jet In The World as our jump off point.

Why did I choose this subject? It's interesting to watch and the topics we can discuss include everything from history to the physics of flight. The physics of flight are really quite interesting and there's quite a lot going on. The process we went through to discover the rules is also really interesting.

I don't know everything about this subject. That's a good thing - as it means I'll be learning right along with you. I do know a bit about the subjects and I'm absolutely willing to learn more - in fact, I want to learn more.

This video is about 2.5 hours long. You can watch it all at once - or there's breaks in it as it was originally a series.. So, you don't have to devote the full 2.5 hours to watching it today.

The video:

https://hooktube.com/watch?v=yZvMljUNCeU

I ask that folks keep the comments related to the subject, as much as is possible. I'm sure we'll digress, if the comments and thread actually turns out to be of interest to folks. But, let's try to keep it civil and informative.

If you know something, share it. If you have a question, ask it. The goal is to learn and I figure this is a subject that's interesting and has lots of things that can be learned. The goal of this thread is to learn stuff. That's it. If you want to learn stuff, this is a good time to do it. If you want to teach us something, this is also a good time to do it.

The thread will stay "open" and stickied until next Sunday at about this time.

I'm going to *try* to do this every week. I'm going to *try* to find something interesting to watch or read. I'm going to *try* to open this thread every Sunday afternoon - and leave it open for the whole week as a stickied thread. I can't be certain that I'll be able to keep this up forever, but I can get it started and maybe someone will take over for me. I'm also not sure what topics we'll be discussing. This week, I've chosen a wonderful documentary called *Building the SU-27 - The Best Fighter Jet In The World* as our jump off point. Why did I choose this subject? It's interesting to watch and the topics we can discuss include everything from history to the physics of flight. The physics of flight are really quite interesting and there's quite a lot going on. The process we went through to discover the rules is also really interesting. I don't know everything about this subject. That's a good thing - as it means I'll be learning right along with you. I do know a bit about the subjects and I'm absolutely willing to learn more - in fact, I want to learn more. This video is about 2.5 hours long. You can watch it all at once - or there's breaks in it as it was originally a series.. So, you don't have to devote the full 2.5 hours to watching it today. The video: https://hooktube.com/watch?v=yZvMljUNCeU I ask that folks keep the comments related to the subject, as much as is possible. I'm sure we'll digress, if the comments and thread actually turns out to be of interest to folks. But, let's *try* to keep it civil and informative. If you know something, share it. If you have a question, ask it. The goal is to learn and I figure this is a subject that's interesting and has lots of things that can be learned. The goal of this thread is to learn stuff. That's it. If you want to learn stuff, this is a good time to do it. If you want to teach us something, this is also a good time to do it. The thread will stay "open" and stickied until next Sunday at about this time.

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[–] • 0 pt (edited )

An airplane flies. It's counterintuitive to many, but here's an easy way to see why.

Get a piece of paper from a standard notebook or from your printer. It should be a fairly thin piece of paper, so that you can see the effect better.

Put that piece of paper in front of your bottom lip, the long way. It should fold/flop down in front of your face.

Now, blow across the top of the piece of paper.

What do you think will happen?

If you do it right, the paper won't be blown down as you might expect it will. What will happen is that the paper will lift up. What you've done is moved the air faster across the top of the paper, creating a lower pressure system above the paper than is below the paper. The air pressure then pushes the paper up - and not down.

Many folks will expect it to go downward when they blow across the paper. That doesn't happen.

That's why an airplane flies, more or less and usually.