<VV> fanz - SPAL #30102113

[JVHRoberts at aol.com]

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!!