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Re: [GMCnet] Keeping it Real, 8 to 10 mpg [message #172736 is a reply to message #172699]

Sat, 09 June 2012 19:39

USAussie

Messages: 15912
Registered: July 2007
Location: Sydney, Australia

Karma:

Senior Member

Mike,

With all due respect I would suggest that you read the whole article (I did)
then readdress the subject.

I agree whole heartedly that vortex generators can reduce drag; HOWEVER,
they have to be designed and located properly.

I doubt that generating a vortex to reduce drag was taken into consideration
when any of the items mounted on the surface of a GMC I mentioned were
designed or located on a GMC.

I'd say at best some of them were designed to reduce their wind resistance,
however, I'd say the OEM mirrors sure flunked that design parameter. Plus
there isn't much you can do with a TV antenna or satellite dish and their
mechanisms to make them aerodynamic.

Regards,
Rob M.
�
-----Original Message-----
From: Mike Miller

Rob,

From what I understand, a small amount of turbulence actually REDUCES
drag.... as long as it is in the right places. That is why golf balls have
dimples.

There are people who make there living figuring out stuff like this... and I
am not one of them! But to get an idea Google "vortex generators" and look
for links that DO NOT have to do with aircraft.

Here is a link to a PDF from Mitsubishi motors... no I didn't read it, I
looked at the pictures!

<http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=11&ved=0CJIBEB
YwCg&url=http%3A%2F%2Fwww.mitsubishi-motors.com%2Fcorporate%2Fabout_us%2Ftec
hnology%2Freview%2Fe%2Fpdf%2F2004%2F16E_03.pdf&ei=aWvTT6PbPKre2AWxuY2kDw&usg
=AFQjCNHArFCd4qeAHReUfG5fPxrlj7fL8w>

Anyway... From my prior readings, when bored... not from education or
experience: With any shape, as long as you know what direction the airflow
is coming from (like the front) you should be able to crate a small amount
of turbulence where the pressures changes from high to low. This turbulence
should form a boundary layer of air that expands (air does that) to make the
shape seem "slipperier" to the air. Lowering drag.

But I MIGHT be full of something... like hot (turbulent) air!
--
Mike

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Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426

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[Message index]

		[GMCnet] Keeping it Real, 8 to 10 mpg By: Mr ERFisher on Thu, 07 June 2012 16:38
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: Harry on Thu, 07 June 2012 16:43
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: kelvin on Thu, 07 June 2012 16:50
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: george beck on Thu, 07 June 2012 17:31
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: ljdavick on Thu, 07 June 2012 17:36
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: jhbridges on Thu, 07 June 2012 18:39
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: Harry on Thu, 07 June 2012 18:45
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: George Beckman on Thu, 07 June 2012 19:09
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: RF_Burns on Thu, 07 June 2012 17:05
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: kelvin on Thu, 07 June 2012 17:08
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: ljdavick on Thu, 07 June 2012 17:41
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: USAussie on Thu, 07 June 2012 18:56
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: stick miller on Thu, 07 June 2012 19:12
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: mannystrans on Thu, 07 June 2012 23:19
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: hnielsen2 on Thu, 07 June 2012 19:46
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: Harry on Thu, 07 June 2012 23:08
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: Chr$ on Fri, 08 June 2012 00:58
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: larry.whisler on Fri, 08 June 2012 08:28
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: Steven Ferguson on Fri, 08 June 2012 07:15
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: Byron Songer on Fri, 08 June 2012 08:09
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: kelvin on Fri, 08 June 2012 10:53
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: roy1 on Fri, 08 June 2012 12:13
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: Jim Galbavy on Fri, 08 June 2012 17:09
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: kelvin on Fri, 08 June 2012 17:19
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: jaholland on Fri, 08 June 2012 18:46
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: Ray Erspamer on Fri, 08 June 2012 21:04
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: USAussie on Fri, 08 June 2012 20:03
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: mike miller on Sat, 09 June 2012 10:57
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: mike miller on Sat, 09 June 2012 11:01
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: USAussie on Sat, 09 June 2012 19:39
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: mike miller on Sat, 09 June 2012 20:01
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: USAussie on Sat, 09 June 2012 20:49
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: mike miller on Sun, 10 June 2012 00:31
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: USAussie on Sun, 10 June 2012 01:52
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: Kudzu on Fri, 08 June 2012 21:26
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: Ray Erspamer on Fri, 08 June 2012 21:29
		Re: [GMCnet] Keeping it Real, 8 to 10 mpg By: JohnL455 on Fri, 08 June 2012 22:43

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