Originally Posted by
Bob Wright
...
I think one thing that would be very helpful to this discussion is some deeper understanding of the potential the use of "fans" have in the future technology beyond vague references to new battery technology, aero advantage etc. The more educated the membership is, the more rational the letters to the CRB will be.
Ducted fans delivering airflow to annular nozzles employing Coanda surfaces , ala Dyson: http://www.google.com/patents/US20130189083
"The air outlet 20 is shaped to direct the primary air flow over the external surface of the inner casing section 30. The external surface of the inner casing section 30 comprises a Coanda surface 36 located adjacent the air outlet 20 and over which the air outlet 20 directs the air emitted from the fan 10, a diffuser surface 38 located downstream of the Coanda surface 36 and a guide surface 40 located downstream of the diffuser surface 38. The diffuser surface 38 is arranged to taper away from the central axis X of the opening 32 in such a way so as to assist the flow of air emitted from the fan 10. The angle subtended between the diffuser surface 38 and the central axis X of the opening 32 is in the range from 5 to 25°, and in this example is around 15°. The guide surface 40 is arranged at an angle to the diffuser surface 38 to further assist the efficient delivery of a cooling air flow from the fan 10. The guide surface 40 is preferably arranged substantially parallel to the central axis X of the opening 32 to present a substantially flat and substantially smooth face to the air flow emitted from the air outlet 20. A visually appealing tapered surface 42 is located downstream from the guide surface 40, terminating at a tip surface 44 lying substantially perpendicular to the central axis X of the opening 32. The angle subtended between the tapered surface 42 and the central axis X of the opening 32 is preferably around 45°."
Are fans based upon this technology in discussion for Formula F Honda Pro racing?
I would then restrict cooling fans by only allowing fans that do not utilize any form of Coanda based technology. Plane old bladed, shrouded fans, like those of Spal, should remain unresticted.