<VV> Corvair Fan

[Ron]

Is this for racing, or what?  What would be the motivation to use it?
RonH

----- Original Message ----- 
From: "Kent Sullivan" <kentsu at corvairkid.com>
To: <virtualvairs at corvair.org>
Sent: Saturday, July 09, 2005 7:59 PM
Subject: RE: <VV> Corvair Fan


> Hi,
>
> The axial vertical fan project that Bob Coffin and I have been inching 
> along
> for several years took an important step today. This morning I dropped off
> the prototype (aluminum) hub, fan blades, and an alignment jig to my
> favorite welder.
>
> I should have it back in a week or so then I will post a picture on my web
> site. The plan is for Bob to test the fan on one of his cars and do some
> airflow measurements. This fan uses the fiberglass housing he made several
> years ago that several racers are using with the Austin fan.
>
> The new fan was designed (using the formulas from the "Fan Handbook:
> Selection, Application, and Design", available on Amazon.com and other
> places) to provide adequate cooling for street use. If it operates as
> expected, hopefully all that might be required is adding some ducting 
> vanes
> to the underside of the fiberglass housing.
>
> If all goes well, we would like to make the production fans out of 
> something
> much lighter than aluminum; perhaps a modern plastic. (But it needs to be
> one that doesn't react with battery acid fumes. We all know the story of 
> the
> prototype Delrin fan creating formaldehyde gas!) There will be a
> price/performance decision to make.
>
> By the way, most of the delay was waiting for a friend to install and
> provide power to the four-axis CNC mill that he purchased for his home 
> shop.
> That took longer than expected but it was worth the wait because he does
> great work. :-)
>
> Stay tuned...
>
> --Kent
> -----Original Message-----
> From: virtualvairs-bounces at corvair.org
> [mailto:virtualvairs-bounces at corvair.org] On Behalf Of JVHRoberts at aol.com
> Sent: Saturday, July 09, 2005 11:14 AM
> To: dkdewald at pasty.net; virtualvairs at corvair.org
> Subject: Re: <VV> Corvair Fan
>
>
> I think one needs to look beyond Corvair cooling blowers, and look to 
> other
> air cooled engines that make more power, etc., and have fewer cooling
> problems.
> Corvair fans are centrifugal blowers, as you point out. Nothing wrong with
> that, but the Corvair blowers, ANY of them, don't represent the best of 
> what
> there is, not by a LONG shot.
> Nor are centrifugal blowers the best for this application. Deutz air 
> cooled
> diesels, Porsche 911s, etc., typically use axial blowers. These tend to to
> be more efficient, and can operate more linearly over a wider range of
> speeds.
> Meaning, they don't go ballistic on HP when driven to redline speeds.
> Hydraulic drives, etc., are interesting, but KISS is always better.  <G>
>
> In a message dated 7/9/2005 1:41:06 PM Eastern Standard Time,
> dkdewald at pasty.net writes:
>
> Hello  folks,
>
> Based on my limited understanding of fluid flow, it is clear to  me that a
> standard automotive radiator fan operates somewhat differently  than the
> Corvair "fan."  The Corvair unit is a centrifugal blower,  and has more in
> common with the blower in, say, a forced warm air furnace  (which blows
> through ductwork--like the Corvair engine).  It is no  surprise to me that
> attempts to use electric radiator fans end in failure;  fans are not
> blowers.
>
> I think that significant improvements could be  made in the efficiency of
> the Corvair blower, particularly the late  magnesium style.  In my mind 
> the
> ideal blower would be modeled after  the early steel curved fin impeller 
> but
> molded from fiber reinforced  plastic.  This would be the minimum starting
> point for making an  electric motor powered Corvair cooling system.
>
> Has anyone considered  using a hydraulic fan/blower drive as done on heavy
> construction and  agricultural equipment?  Just a thought.
>
> Dale Dewald
> Hancock,  MI
>
>
>
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