<VV> Air vs Water HP

[Dave Morris]

Here are some things Rad Davis had to say about the general topic:
http://www.mindspring.com/~corvair/RadFAQ/ElectricFans.html

Dave Morris

At 03:22 PM 7/8/2005, you wrote:
>
>Well.....
>
>A Corvair fan, no doubt, uses more HP than a water pump, there can be no
>doubt. Given that electric cooling fans can cool waterpumpers just fine, 
>with
>reasonable amounts of power, but NOT a Corvair engine, it's pretty clear 
>that
>the Corvair has the more HP intensive cooling solution. But then again, even
>911s use more power for cooling than water pumpers.
>Water has SO much more specific heat and density than air, even modest
>amounts of pump HP can move heat away from an engine easily.
>Radiators have extended fin areas, with MANY times more square feet of
>cooling surface than ANY air cooled engine of the same power, that the air 
>flows
>easily through it, with little pressure drop. Corvair engines need LOTS of
>pressure drop to get good heat transfer, and even then, it's not that good.
>
>That being said, Corvair cooling fans don't consume huge amounts of power  at
>cruise. But at full power, that's another story, by a BUNCH!!
>
>John
>
>In a message dated 7/8/2005 4:09:42 PM Eastern Standard Time,
>minoxphotographer at yahoo.com writes:
>
>Just a  curious question.
>I have read a few articles about how the Corvair cooling  fan uses a
>chunk of horsepower to do it's job.  How does it compare to  the
>waterpump/fan horsepower used in a conventional engine?  Which  turns
>out to be more effecient?  Just wondering.
>
>Tim in  Bovey
>
>
>
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