Diagonal Flow Fans for a 911?

[kach22i]

Tell me all about Diagonal or Mixed Flow Fans and Compressors, would there be an advantage to cooling an old Porsche 911 this way?

Are they more efficient than an axial fan with a 90 degree elbow discharge and stator vanes to straighten the flow? The flow over the boxer engine layout takes several right angle turns, would it be worth the bother?

How do the pressure recovery losses compare? My meaning here is which fan (Diagonal or Axial) has a superior ability to draw air into it's self? This condition may be found in serpentine or convoluted ducted air intakes found in scaled RC aircraft and our 911's, but most commonly used for computer cooling fans today.

http://en.wikibooks.org/wiki/Jet_Propulsion/Compressors

As the name might suggest, a diagonal (or mixed) flow compressor is a cross between an axial and centrifugal compressor, where the flow takes a diagonal route through the compressor, exiting diagonally (rather than radially) at a significantly higher higher mean radius than at inlet. The compression process is part axial and part centrifugal.

So far, only a few examples of these units have been tested worldwide. They do, however, offer the advantage of a relatively high pressure ratio per stage, without the need for a relatively large diameter exit diffuser, which can cause installation problems.

http://en.wikipedia.org/wiki/Diagonal_or_mixed-flow_compressor

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A diagonal or mixed-flow compressor is effectively a cross between a centrifugal and axial-flow compressor. The American term diagonal-flow is very apt, because these compressors combine both axial and radial velocity components. The prime advantage is the relatively small diameter across the exit diffuser, compared with that of the equivalent centrifugal compressor. A diagonal-flow compressor is featured in the Pratt & Whitney Canada PW610F turbofan, recently certified for the Eclipse 500 Very Light Jet aircraft.

Real Life Example:
http://www.jinzhoufan.com/doce/index02.htm
XLT2 Diagonal-Flow Fire-Protection Fan

Compared with centrifugal fans and axial-flow fans of the same number and power, the flux of XLT2 Diagonal-Flow Fan is higher than the former and the full pressure is higher than the latter. The figure dimension is relatively small and the weight is between the centrifugal and axial-flow ones. Owing to the sound structure, this type of fans has relatively low noise, high efficiency and smooth operation when running. It is the new product to replace axial-flow and mixed-flow fans.

　　Thanks to the topping quality, new structure and easy installation, it is widely used in factories, mines, hotels and underground facilities of tall buildings as well as the distant series installation in relatively long vent pipes so as to increase the full pressure in the pipe.

NOTE: I put this in O.T. because I might try to sway any conversation towards hovercraft or aircraft.

http://www.arrow.net.bz/aws/resource_mag/august_2004/engineering/ebm.html

With cooling demands constantly increasing, tubeaxial fans are becoming incapable of meeting today’s tougher needs. The fan speed for a tubeaxial has to be increased to meet the current flow and pressure requirements, but this makes it impossible to meet power and acoustic goals. The solution—diagonal fans from ebm-papst.