Vince Orton wrote:

... SNIP ...
- Why are engine driven fans not discussed?  We have pulleys, so the
fans could be located below, and in-line with the accessories.  Keep in
mind the fan(s) could be smaller, or could be a "squirrel cage", like
home FAUs (Forced Air Units) use.  Ducting could control air paths to
pull through the radiator.  Ideas?  Problems?

- Could the compressor section of a large turbocharger be used to pull
air from the backside of a radiator, and then dump it overboard (or air
blast hot spots)?  Is this "out there"?  I think this has merit since
increasing power causes an increase in cooling airflow.  Heck, I suppose
the turbocharger could still maintain an induction compressor section,
too.

Just some ideas ...

Thanks,
-Vince Orton

... SNIP ...
I think you mean cooling air flow ejector rather than "Exhaust airflow
augmentation". The distinction is important when trying to search the NACA
data base.  According to NACA it can work well if you have the room to implement
a proper diffuser.
... SNIP ...

Paul Lamar

... SNIP ...
Air flow ejectors - how efficient?  It seems that the exhaust airflow
would "suck" more cooling air at high power settings - exactly when
needed.  Suck from the back of the radiator, of course.  (Belly mounted,
preferably...)
... SNIP ...

What temp does Ken run that propylene glycol at?  Problems?

You didn't address two of the ideas I had.  What did you think?
- "Squirrel cage" engine driven fan.
- Turbocharger fan.  (Quiet exhaust AND a cooling fan in one!)  :)

--
Thanks,
-Vince Orton

The exhaust velocity is high on high power takeoffs and climbs.
Read the NACA papers on ejectors and they will explain why they become less
effective at higher speeds.

I am not sure about the squirrel cage. I don't know whether it is better or
not. It would be more of a restriction when not needed however.

Turbo charger compressors are more suited to move high pressure air
at high speeds while fans are more suited to move low pressure air
at relatively low speeds. Probably for the same reason a helicopter
blade is longer than a prop blade. Compressing air also heats the
air and hot air is not what you want.

Paul Lamar

Turbo compression can heat the air all it wants ... it's going
overboard, remember?

In fact, why not blow it over the exhaust pipes on the way out?  Maybe
in an "exhaust pipe duct/box" to keep the rest of the cowl cool.

The "turbo fan" would *suck* from the back side of the radiator,
probably in a ducted arrangement.  It too would work better on high
power takeoffs and climbs.

Is there merit to this, or am I chasing shadows?

--
Thanks,
-Vince

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