Drag coefficient curves

40:18this is the curve that you're going to be looking at. On the x-axis is the speed of the ball. On the y-axis is the drag coefficient. At low speeds, you've got a laminar boundary. And so, the ball is going to hug I mean, sorry, the laminar flow is going to hug the ball, but then it's going to disconnect very quickly. And you're going to get a massive low-pressure region that's going to cause a lot of drag. >> Oh, actually, that makes sense. >> As I as I increase the speed of the ball, the the laminar flow is going to hug the ball, and there's not going to be that much low pressure, which means that the ball is just going to be fine. That at least that effect is is gone. And so, your drag coefficient there's there's a period where the drag crisis happens. That's the drag crisis regime,

40:59right? It should be it should be flat, but it's not. There's a part that goes down. >> It's It's almost like the If you give the the the flow more time, it will dissipate outwards. But basically, the faster it's moving, you don't give it enough time almost to get out of the that sort of contour of moving around the object that's coming through it. >> Exactly. >> And so, that's where you get the lower >> Exactly. And this is why this is why golf balls are not perfectly spherical. They have those dimples. Actually, if you go to the next one, photo number 22,