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Politics : Formerly About Advanced Micro Devices -- Ignore unavailable to you. Want to Upgrade?

To: nicewatch who wrote (1567211)	10/22/2025 5:54:57 PM
From: Mongo2116	3 Recommendations Recommended By Goose94 pocotrader rdkflorida2 Respond to of 1570113

To: nicewatch who wrote (1567211)	10/22/2025 5:55:39 PM
From: Mongo2116	3 Recommendations Recommended By Goose94 pocotrader rdkflorida2 Read Replies (1) \| Respond to of 1570113

To: nicewatch who wrote (1567211)	10/22/2025 10:03:36 PM
From: pocotrader	1 Recommendation Recommended By Goose94 Read Replies (1) \| Respond to of 1570113

great song

To: nicewatch who wrote (1567211)	10/23/2025 3:27:27 AM
From: Heywood40	1 Recommendation Recommended By longz Respond to of 1570113

To: nicewatch who wrote (1567211)	10/23/2025 4:37:35 PM
From: Heywood40	1 Recommendation Recommended By Tenchusatsu Respond to of 1570113

Here's some pics of a project we were required to build in the Airframe course. I got it out of the garage, I haven't looked at it for years. Note the corrosion and cobwebs. All the aluminum was flat stock to start with, and had to be bent on a bending block, or hand-formed. To form the leading edge ribs, we had to scale the drawings, cut and shape a hardwood form with the proper radius on the edge, then clamp the aluminum to it and hammer the aluminum over the form with a rawhide mallet. The aluminum won't make that compound bend all at once without cracking, so we had to do it incrementally, and anneal it after each increment, to soften it up again. Then when we were done, we had to heat treat it again to restore its proper hardness. One panel is dope & fabric, and you can see they made us cut it and repair it, and install an inspection port. We had to cut a piece of the aluminum out and make a patch with flush rivets. The section with two sheets of aluminum has a honeycomb structure inside. The little spoiler on the leading edge would help improve the wing's stall characteristics. The kitten is a foster. He hadn't seen it before, so was very interested.

To: nicewatch who wrote (1567211)	10/24/2025 1:26:20 AM
From: Heywood40	1 Recommendation Recommended By Eric Respond to of 1570113

When I was an ATC, they taught us a lot of weather. The Coriolis effect is what causes air masses to move counter-clockwise around a low pressure area (in the northern hemisphere). I thought I understood the Coriolis effect at the time, but it wasn't until I studied helicopter aerodynamics that I really got it. Consider the rotor blades in hover, cutting through the air, generating equal lift through 360 degrees. Then start flying. At a forward speed of 60 MPH, the advancing blade is moving through the air 120 MPH faster than the retreating blade. You can't have more lift on one side than the other, though, or the helicopter would just roll over. In order to dissipate that extra lift, the advancing blade is allowed to "flap" up, which decreases the extra lift it gets from that higher airspeed. Then it "flaps" down on the retreating side, where the blade's airspeed is lower. If you ever have the opportunity to see a helicopter flying directly toward you, you will be able to see that the blades on the right side of the helicopter are higher than the blades on the left side, for helicopters manufactured in the US. European helicopters, of course, rotate in the opposite direction, and the effect is reversed on them. When the advancing blade flaps up, the tip of the blade moves closer to the axis of the rotor shaft, or the center of rotation. That's where the Coriolis effect happens. Because the tip of the blade has moved closer to the center of rotation, its inertia forces it to move forward. It has the same energy, but is moving on a shorter radius (and a shorter circumference), and its mass and inertia force it to accelerate along that shorter path. The forward motion is referred to as lead. On it's way down, on the retreating blade side, it slows as its radius and circumference increase, which, again, due to its mass and inertia cause it to slow down, and move behind its neutral position. That motion is referred to as lag. Viewed from the top, (you'd need a high speed camera to see it) the blades will be forward of where you would expect them on the advancing blade side, and behind where you would expect them on the retreating blade side. Every revolution of the rotor has the blades flapping up, leading, flapping down, lagging. That's a lot of motion taking place where the rotors attach to the hub. Part of the helicopter daily inspection is to take a very close look at the connections between the rotor blades and the hub, and to apply vertical and lateral manual force to the blades to make sure there's no play there. My apologies if you already know all this... maybe someone else will find it interesting.