nowhere of water droplets?

[cwes99_03]

when was the last time you examined a hailstone?

[Jay-qu]

Originally Posted by Turtle

___On further reflection I have to chuckle When does the bumpyness stop being dimply & start being protuberenty? I mean every dimple has protuberent sides & every protuberence has dimply sides.

well if you think of a virtual sphere and when a 'bump' goes inside the sphere it is a dimple, and when it raises above the sphere it is a protuberence

[Turtle]

Originally Posted by Jay-qu

well if you think of a virtual sphere and when a 'bump' goes inside the sphere it is a dimple, and when it raises above the sphere it is a protuberence

Yes..and...? Take your virtual sphere & populate its surface with protuberences. In so doing, you have inadvertantly populated it with dimples, which lie between & under the protuberences. Now do the opposite; start with the virtual smooth sphere & populate it with dimples. Voila, automatic protuberences.

[Boerseun]

Originally Posted by Jay-qu

well if you think of a virtual sphere and when a 'bump' goes inside the sphere it is a dimple, and when it raises above the sphere it is a protuberence

Is a zebra white with black stripes, or black with white stripes?

[Jay-qu]

Originally Posted by Turtle

Yes..and...? Take your virtual sphere & populate its surface with protuberences. In so doing, you have inadvertantly populated it with dimples, which lie between & under the protuberences. Now do the opposite; start with the virtual smooth sphere & populate it with dimples. Voila, automatic protuberences.

But there is a slight difference... in option A you end up with convex protuberences and in option B you have concave dimples... think about it they look different

[Jay-qu]

Originally Posted by Boerseun

Is a zebra white with black stripes, or black with white stripes?

white with black stripes, owing to the fact that their bellies and the insides of their legs are purely white

[Boerseun]

Originally Posted by Jay-qu

white with black stripes, owing to the fact that their bellies and the insides of their legs are purely white

Then again' I'd say black with white stripes, seeing as the insides of their ears are pure black...

[Turtle]

Originally Posted by Jay-qu

But there is a slight difference... in option A you end up with convex protuberences and in option B you have concave dimples... think about it they look different

___The point is that the inside of a convex protuberence is a concave dimple. I believe there is a difference - a boundary if you will - where for our golf-ball & hailstone examples, the drag starts increasing rather than decreasing. If the dimple depth/protuberence height ratio is at some 'low' level you get low drag far flying balls; if the ratio is large, you get high drag short flying balls.

[Turtle]

Originally Posted by Boerseun

Is a zebra white with black stripes, or black with white stripes?

___If you shave a Zebra, other than an angry Zebra, what do you see? I only ask as I recently heard that not only do Tigers have striped fur, they have striped skin.

[Jay-qu]

Originally Posted by Boerseun

Then again' I'd say black with white stripes, seeing as the insides of their ears are pure black...

the inside of their ears isnt black... unless you count the fact it would be dark and hence black without a torch light