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mamut mamut is offline
Join Date: May 2008
Location: Stuttgart & Miami
Posts: 611
Originally Posted by Speedy Squirrel View Post
Blade curavature design is based on the speed at which the efficiency of the fan is desired to be greatest. Current automotive fans have the S curve design. This is good with electric motors running them at very high speed, where it is desired to have the best efficiency.

For an engine driven fan, (no longer used in new automobiles), you need to produce the target airflow, pressure, and efficiency at a range of speeds, and at a lower speed, which makes such a design less suitable. Also, a Porsche fan is actually a ducted axial fan, in which case I would think the backward curvature is better for efficiency, especially with variable speeds. It seems Porsche also reached that conclusion. Also, noise and efficiency are really the same thing really. Acoustic energy is wasted fan energy.

None of that really matters though. What makes anybody think that more airflow is going to produce more cooling? Think on it a little more.
Then what is the reasoning behind Porsche flat fan? better air distribution?, it seems that those flat fans flow much more air!.
Old 08-10-2009, 02:36 PM
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