This is the Lancair IV EngineAir V8 cooling system.
$68,000 firewall forward. AC is an optional extra.
EngineAir does not park it in the auto engine row
as they don't want to be painted with that brush.
The fan is made by the Italian company called
Spal. Two are used. One on each side. Part number VA13-AP6-63S.
Supposedly used on Ferrari and other high buck
European cars.

I had a long talk
with Al Joneck(s?) the engineer on this project
and he tells me the fan does not rotate as fast as
one would think. The pressure on the front fan blades
is somewhat canceled by the pressure on the rear blades
according to Al.

The idea of a fan makes a lot of sense. Why use a radiator and intake
hole-duct large enough to cool on the ground and initial climb
out when you can use an electric fan and turn it off for high speed
cruise where the dynamic pressure available to force
air through the rad is four times higher?

I'd suspect that the fan does nothing after the taxi speed gets anywhere
near takeoff.  It likely has the capability to generate about 1/2" H2O
differential pressure.

Al Gietzen

Perhaps you are right Al.
It is amazing what a 1/2 inch of H2O can do for a car. If my Dodge Caravan electric 
cooling fan fails (and it has) the engine overheats climbing a 500 foot hill at 60 MPH.
Probably less than 100 HP from the engine based on the instant MPG computer
on the overhead. The fan motor sucks about 30 amps so at 12 volts that is 
about 1/2 a horse.

Paul Lamar
 
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