Subject: Re: [harryproa] Re: 15 micron finish
From: "Robin Warde robin.warde@gmail.com [harryproa]" <harryproa@yahoogroups.com.au>
Date: 9/6/2016, 10:51 AM
To: "harryproa@yahoogroups.com.au" <harryproa@yahoogroups.com.au>
Reply-to:
harryproa@yahoogroups.com.au

 

I googled it and came up with this from 2004, which I had heard of.
https://www.sciencedaily.com/releases/2004/05/040517072242.htm

HOWEVER, a more recent analysis (which I did not read until just now) says the speed is not due to the skin shape :-(
http://www.latimes.com/science/sciencenow/la-sci-sn-dolphin-power-propulsion-bioinspired-speed-swimming-20140121-story.html

On balance, I reckon science and the LA Times do not have the final say yet, and 'the jury is still open' on this, especially as golf balls and sea-slide work. 

On Tue, Sep 6, 2016 at 3:35 PM, Björn bjornmail@gmail.com [harryproa] <harryproa@yahoogroups.com.au> wrote:
 

They have?

On Tue, Sep 6, 2016 at 3:27 PM, Robin Warde robin.warde@gmail.com [harryproa] <harryproa@yahoogroups.com.au> wrote:
 

And I understand dolphins have 'dimpled' skins?

On Tue, Sep 6, 2016 at 11:31 AM, Björn bjornmail@gmail.com [harryproa] <harryproa@yahoogroups.com.au> wrote:
 

Mike wrote:
> Clearly, the smoother the finish, the faster the boat is going to be.

Yes it seems that's the case for boats.

But I've seen in other areas that a rough surface might be an
advantage. Intake ports in cylinder heads. Or the classic example of
golf balls.

I guess it depends on the fluid, speed, size e.t.c. The reynolds number.

Sea slide looks interesting, especially if it lasts.




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Posted by: Robin Warde <robin.warde@gmail.com>
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