<VV> Re: (no subject)

[ScottyGrover at aol.com]

In a message dated 8/7/2007 1:51:53 P.M. Pacific Daylight Time,  
mfrancis at wi.rr.com writes:

 
Hi  Scotty, 
I think we’ve had a breakthrough,  at least in the manner that we would have 
to go  through. 
This is a more ‘doable’ plan than  my first recommendation the whole fan be 
duplicated in carbon  fiber. 
Rather than starting from scratch,  in the creation of a fan, the existing 11 
blade fan can become the base of a  more developed composite magnesium/carbon 
fiber  assembly. 
I can mold a carbon fiber top ring  , that bonds down to the top of each of 
the existing mag vanes, that have been  relieved of enough material along the 
top  (.080”), to form two tabs which key  into the cut top-ring slots. 
This can be used to make a really  simple fan modification that should 
compress better than the open, stock  design, with just the top ring. 
But the process can be taken one  step further, and additional flat carbon 
vanes, just the length of the ring  width, can be installed between the existing 
mag vanes, to create a 22 vane  compressor fan. 
We can then measure the output of  the two designs to compare. 
With this bonded assembly, we gain  the advantage of a 22 vane fan at about ¼ 
the weight of the steel  fan. 
And much easier to modify existing  fans than to reinvent the wheel, 
literally 
If the assembly works out as a  viable alternative, I could probably modify 
these fans on an exchange basis.  They’ll have to be re-balanced, too. 
My initial goal would be to supply  a fan that works well for an 
electric-motor installation, which should pump an  ample  
volume of air at lower speed, say  about 3000 rpm, constant speed. They could 
be viable in a higher speed belt  driven setup too, but that goal could be 
left to a later development  point. 
Regards,  Mel 




Mel, I like your idea of interposing 11 more blades, but there's one  
problem--the 11 blades are not evenly spaced (to cut down on fan roar.) The top  
ring--lovely--but if you were to create new fan vanes, wouldn't it be better to  
have them curved so as to scoop the air?  22 or more of these, evenly  spaced 
and tabbed to the top  and bottom rings (my 16-blade unit has each  blade 
tabbed twice to the top ring and five times to the bottom ring.)
 
Tell me what you think of this,
 
Scotty from Hollyweird



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