[DeTomaso] Cooling system hose questions

Asa Jay Laughton asajay at asajay.com
Thu May 28 22:58:52 EDT 2009


Okay, obviously I'm not communicating this correctly.  The fan blades 
are -straight- from the center hub to the outside ring.  There is no 
curve to them between the hub and the ring.  We'll say each blade is 
about six inches long by about two inches wide. The blade is straight 
along it's length.  The blade is convex, or curved across the width.

Stock Pantera fan:
http://www.teampanteraracing.com/index.php?option=com_g2bridge&view=gallery&Itemid=57&g2_itemId=2554

Note how it has a curved (convex) blade that effectively -scoops- the 
air as the blade goes around, blowing air into the radiator.


Now look at the dual fan assembly here:
http://www.teampanteraracing.com/index.php?option=com_g2bridge&view=gallery&Itemid=57&g2_itemId=2548
http://www.teampanteraracing.com/index.php?option=com_g2bridge&view=gallery&Itemid=57&g2_itemId=2551

Note how it too has curved blades, but also note that when mounted to 
the -back- of a radiator, in a sucker arrangement, -and- the fan turning 
in the correct direction to suck air through the radiator, the curve 
will not be scooping the air.  To me, this creates an inefficiency.

Do the photos help?
Asa Jay


Asa Jay Laughton, MSgt, USAFR, Retired

& Shelley Marie
Spokane, WA

1971 Mach I Mustang  [ASA JAY]
1973 Pantera L 5533  [ASASCAT]
    
******************************     
http://www.asajay.com
http://www.teampanteraracing.com
  



MikeLDrew at aol.com wrote:
> In a message dated 5/28/09 13 51 16, asajay at asajay.com writes:
>
>
>   
>> I don't mind the curve, what I mind is that it's not "scooping" the 
>> air with the curve.  Imagine for a moment, mounting an orignal Pantera 
>> fan on the motor backwards, so the curve is the wrong way.  It still 
>> works if the motor turns the right way, but how less efficient is it?
>>
>>     
>>>> Scimitar fans don't work by scooping the air.   They are deliberately 
>>>>         
> curved so that the outside of the fan blade trails the inside by several 
> inches.   I don't understand why it's better, but it's the latest trend in 
> propeller/fan aerodynamics.   Among other things, it is much quieter.   From the 
> Spal website FAQ section:
>
> Q.    What's the difference between the straight blade fans and the curved 
> blade fans?
> A.     The straight blade fans provide maximum cooling for their size.  The 
> curved blade fans sacrifice a small amount of performance in return for a 
> much quieter fan. If noise is an issue, go with the curved blade fans.  If 
> ultimate performance is the objective, use the straight blade fans.
>
> Mike
>
>
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