<VV> fanz - SPAL #30102113

[Ron]

And there's also the realistic and logical probability that there's nothing 
new in blower technology, only in fabrication possibilities and that nothing 
will come up any better that tighter gaps won't account for.  Certainly the 
fit between the blower wheel and the top shroud must be quite loose to 
enable low cost mass production.  A Fan Handbook would answer all of your 
questions.
RonH

----- Original Message ----- 
From: <JVHRoberts at aol.com>
To: <geoffj at unm.edu>; <virtualvairs at corvair.org>
Sent: Thursday, August 04, 2005 5:21 PM
Subject: Re: <VV> fanz - SPAL #30102113


>
> Well, there are several possibilities:
> 1. Someone on this list has made one!
> 2. 911s use a fan that is probably VERY good, albeit it spins the wrong 
> way,
> unless someone does a reverse wrap serpentine belt.
> 3. There are several large air cooled diesels, like Deutz, that have very
> nice blowers, and some of them even spin the right way!
> 4. All of these are axial flow. As such, you ALSO need a housing where the
> blade tips run VERY close to the walls to keep it efficient, as well as 
> having
> a  few stator vanes. See 911 fan design.
> 5. Not sure centrifugal is the way to go here. Potentially, it'll make 
> more
> pressure, but the axial ones are efficient over a wider range.
> And lastly, cutting the fan isn't hard. Designing it is!!!
>
> In a message dated 8/4/2005 8:56:19 A.M. Eastern Standard Time,
> geoffj at unm.edu writes:
>
> So why  does not one of the M.E. types on the list draw up a "modern" fan
> and have
> it cut on a CNC machine and see how it works?  Not that hard, I have  a
> basic
> one drawn up in PRO-E but I hate using that program, and dont  have handy
> access to a machine to cut one.  Cant be that  hard.
> ...end all this the mechanical fan is soinefficient etc..  whining...
> -Geoff Johnson
>
>
>
>
>
> On Thu, 4 Aug 2005  JVHRoberts at aol.com wrote:
>> tough.  Getting enough flow at full  power is a VERY different matter.
>> The only way I know to do it is to  use a high pressure and VERY 
>> efficient
>> fan. Note, this means NOT  electric!!
>
>
>
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