<VV> Re: Cooling fans

[JVHRoberts at aol.com]

Aluminum. Investment casting. The cheapest way to make small runs, and it's  
GREAT for casting thin sections! Heck, you can even have magnesium cast this  
way...
 
In a message dated 8/6/2007 12:19:37 A.M. Eastern Daylight Time,  
ScottyGrover at aol.com writes:

Hi   Scotty, 
If you’re really going to get into  this, I think you’re  bound to find out 
that an aluminum pattern has to be made  larger  than the intended final 
size, 
to account for shrinkage. So using an   original steel fan would yield a part 
that was smaller than original   dimensions. I think the pattern has to be 
1.2 
times the intended  final  size. 
I work in aircraft and automotive  composites and  have been reading the fan 
discussion over the last week. It  occurred  to me that making a mold of the 
original ’61 fan, top and bottom,   then duplicating the vanes in flat stock, 
would allow for a detailed,  but  exact duplicate of the original fan 
assembly that 
would be much  lighter,  especially if the laminate used was carbon fiber 
with 
a  high-temp resin. A  carbon fiber assembly could be as little as ¼ of the  
present steel  weight. 
So, as you examine your options   tomorrow, consider this as an alternate way 
of getting the fan we need  for  modern Corvair performance cooling. With 
composites, we can run  as many vanes  as needed, at any angle desired, even 
curved 
vanes! A  fixture can be used to  mill slots in the upper and lower shells 
that  
the vanes key into, and a  high-temp adhesive used to do the final  assembly 
of all the  parts. 
Just something to think   about……. 
Regards, Mel  Francis 
Oconomowoc,   WI


 



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