<VV> fanz - SPAL #30102113

[JVHRoberts at aol.com]

A fan handbook MIGHT help. I am sure one of the reasons there's a dearth of  
acceptable blowers is this application requires quite a bit more pressure than 
 your average air mover, but not as much as a compressor. No doubt one could 
be  designed and built...
 
In a message dated 8/4/2005 8:45:58 P.M. Eastern Standard Time,  ronh at owt.com 
writes:

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!!!