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  #76  
Old 03-13-2013, 01:40 AM
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Default Re: Drive by science

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Who Goes There?
We used to have a very nice vacation home on Lake Vostok. We let it go after a bunch of foreigners moved in and started drilling. They totally ruined the neighborhood and drove down property values. We took a bath when we sold that place. The upside is that we are now much cleaner after the bath got rid of all the contamination.
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  #77  
Old 03-13-2013, 02:04 AM
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Default Re: Drive by science

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I just put that in the Miscellany thread.
Whoop, I missed it!

Of course it's always easy to over-interpret dolphin actions in human terms. But there are very few creatures - and no domesticated ones I know of - that would behave in that fashion.
They are fascinating and incredibly intelligent but they also make me quite sad if only because of the cruelty and the rape.

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They're amazing creatures. It's sad we're driving them to extinction in many parts of the world.
Maybe, but it certainly cuts down on the dolphin rape.
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  #78  
Old 03-13-2013, 02:08 AM
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Default Re: Drive by science

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Contaminated by what? Alien spores? :chin:
I'm not sure how you go from, not related to anything else, to just a contaminant. Unless, they stated results before they had done sequencing. Once they had a sequence though it should have been trivially easy to compare to known genomes.
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  #79  
Old 03-20-2013, 03:35 AM
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Default Re: Drive by science

An interesting perspective on natural evolution and engineering evolution:

Someone posted this image:


And someone saw something familiar in it and followed it up with this:


Noting that the profiles are similar enough that it's likely not incidental nor accidental. And to save some time, here's a composite:

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  #80  
Old 03-20-2013, 11:23 AM
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Default Re: Drive by science

Here's one with landing gear down and air brake flaps extended:

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  #81  
Old 03-20-2013, 06:46 PM
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Default Re: Drive by science

The similar shapes are not accidental at all, of course -- that's streamlining. If you're moving through a fluid (whether air or water), and you want to minimize resistance and drag-inducing turbulence, then you had better be shaped in such a way that the fluid flows over your surfaces as smoothly as possible, with minimal resistance and turbulence.

It's a really neat illustration of how function dictates form, isn't it?

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  #82  
Old 03-21-2013, 01:47 AM
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Default Re: Drive by science

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Originally Posted by The Lone Ranger View Post
The similar shapes are not accidental at all, of course -- that's streamlining. If you're moving through a fluid (whether air or water), and you want to minimize resistance and drag-inducing turbulence, then you had better be shaped in such a way that the fluid flows over your surfaces as smoothly as possible, with minimal resistance and turbulence.

It's a really neat illustration of how function dictates form, isn't it?



You didn't note the speed of the air or fluid involved, but those figures would corrospond to about 140 MPH in air, probably different with other fluids like water, according the the research I had done many years ago. The % of drag would vary at different speeds and at very low speeds there would not be much difference. At higher speeds Laminar flow and turbulance come into play with different effects than in these illustrations.
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  #83  
Old 03-21-2013, 02:53 PM
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Default Re: Drive by science

Also in the top left picture that plank is, like, flying with the flat bit forward. TLR, you failed to note that nobody throws a board that way, according to some board throwing I used to do.
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  #84  
Old 03-21-2013, 03:26 PM
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Default Re: Drive by science

A cricket bat is swung flat ways, which would mean, according to the diagram, that it would be twice as hard to swing as a baseball bat.
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  #85  
Old 03-21-2013, 03:39 PM
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Default Re: Drive by science

Wind resistance (the drag in air flow) increases up to the speed of aproximately 140 MPH, and up to this speed a rough surface gives less drag than a smooth polished surface. This is due to the trubulence at the surface acting like tiny ball berrings to allow the air to pass over more smothly. At aprox. 140 MPH the drag drops off as the flow becomes Laminar and turbulence creates more drag. Laminar flow continues as speed and drag increase.
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  #86  
Old 03-21-2013, 03:53 PM
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Default Re: Drive by science

As I am wont to do, I was listening to This Week in Parasitism. The world is a weird, wild place.

As you could guess, do not follow this link if you are at all squeamish.

You should not look at this video either. Its title is "Giant Kidney Worm," and it's about the surgical removal of a giant kidney worm. (There is a happy ending, though.)



Forgot to add: :projectilevomit:
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  #87  
Old 03-21-2013, 04:59 PM
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Default Re: Drive by science

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In my intro to bio class we liked to play Mammal Mammal Bird Fish Submarine.









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  #88  
Old 03-21-2013, 10:08 PM
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Default Re: Drive by science

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Originally Posted by thedoc View Post
A cricket bat is swung flat ways, which would mean, according to the diagram, that it would be twice as hard to swing as a baseball bat.
No, it means that air resistance would be twice as much.

They both have the factor of their weights to consider as well.
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  #89  
Old 03-22-2013, 08:09 PM
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Default Re: Drive by science

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Originally Posted by The Lone Ranger View Post
The similar shapes are not accidental at all, of course -- that's streamlining. If you're moving through a fluid (whether air or water), and you want to minimize resistance and drag-inducing turbulence, then you had better be shaped in such a way that the fluid flows over your surfaces as smoothly as possible, with minimal resistance and turbulence.

It's a really neat illustration of how function dictates form, isn't it?

The 1914 Alfa Aerodynamica was not only streamlined, it took advantage of skin-dimpling, which has been proven by Mythbusters to be more aerodynamic than smooth surfaces.



You can't get much more drive-by sciency than that.
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  #90  
Old 03-22-2013, 09:15 PM
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Default Re: Drive by science

From my understanding skin dimpling, and shape are both trying to solve the same basic problem, laminar boundary separation. Dimpling helps by creating small vortexes above the object skin, producing a low pressure space between it and the laminar flow, causing it to be pushed against the skin longer creating a smaller wake. The effects of dimpling are most seen in fluids with high flow and low viscosity.

In just another look to nature moments, you will notice birds have rather rough surfaces with feathers covering their bodies, on the other hand many water dwelling creatures have smooth bodies covered in scales.
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Old 03-22-2013, 10:35 PM
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Default Re: Drive by science

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From my understanding skin dimpling, and shape are both trying to solve the same basic problem, laminar boundary separation. Dimpling helps by creating small vortexes above the object skin, producing a low pressure space between it and the laminar flow, causing it to be pushed against the skin longer creating a smaller wake. The effects of dimpling are most seen in fluids with high flow and low viscosity.

In just another look to nature moments, you will notice birds have rather rough surfaces with feathers covering their bodies, on the other hand many water dwelling creatures have smooth bodies covered in scales.

It's all relative to viscosity and speed. In air a rough surface is better up to about 140 MPH. This is going to be different in other fluids. An engineer once related a study that indicated that at very high presures the resistance of hydraulic fluid in a pipe went down, but I was not present for the presentation of the study and it was many years ago that I heard about it.

A good, and common, example of skin dimpling is the golf ball,
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Old 03-22-2013, 10:45 PM
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Default Re: Drive by science

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A cricket bat is swung flat ways, which would mean, according to the diagram, that it would be twice as hard to swing as a baseball bat.
No, it means that air resistance would be twice as much.

They both have the factor of their weights to consider as well.

Baseball Bat 33oz. - 39oz.

Cricket bat 39oz. - 48oz.
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Old 03-22-2013, 10:52 PM
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Default Re: Drive by science

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From my understanding skin dimpling, and shape are both trying to solve the same basic problem, laminar boundary separation. Dimpling helps by creating small vortexes above the object skin, producing a low pressure space between it and the laminar flow, causing it to be pushed against the skin longer creating a smaller wake. The effects of dimpling are most seen in fluids with high flow and low viscosity.

.

I have often wondered how the 'vortex generators' on the Iowa class Battleships affected their speed. They were supposed to be to enhance maneuverability. And if that technology has been encorporated in other classes of US Navy ships?
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Old 03-22-2013, 11:07 PM
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Default Re: Drive by science

Rumor has it that the Navy has submarines and torpedoes that use supercavitation to reduce drag about 70%.
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Old 03-23-2013, 12:07 AM
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Default Re: Drive by science

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A cricket bat is swung flat ways, which would mean, according to the diagram, that it would be twice as hard to swing as a baseball bat.
No, it means that air resistance would be twice as much.

They both have the factor of their weights to consider as well.
Baseball Bat 33oz. - 39oz.

Cricket bat 39oz. - 48oz.
Yes, and?

Is this supposed to show that you're right about it being twice as hard to swing the cricket bat?
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Old 03-23-2013, 05:10 PM
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Default Re: Drive by science

At the speeds one swings a 39 ounce bat (~20 mph), the aerodynamics of said bat makes only a small difference in swing speed, but I know which one would make a better canoe paddle.
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  #97  
Old 03-24-2013, 06:34 AM
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Default Re: Drive by science

Bat Speed - Increase Bat Speed - Bat Speed Training

The Average Bat Speed For A Youth Baseball Player | LIVESTRONG.COM

http://www.efastball.com/hitting/ave...-by-age-group/
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Old 03-24-2013, 11:46 AM
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Default Re: Drive by science

I'm sure those represent peak speeds, not average for the swing.
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Old 03-24-2013, 01:21 PM
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I'm sure those represent peak speeds, not average for the swing.

I'm sure they are, just for you.
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Old 03-24-2013, 01:51 PM
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Thanks. :D
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