[fastvair] Re: <VV> Electric cooling fan results

[FrankCB at aol.com]

Seth,
    Well, if you can do it with a low HP fan, you might  be able to pull it 
off.  A ONE HP fan, at 100% efficiency, uses 62 amps of  12 volt electricity.  
But as you go to 2 or 3 HP fans, the consumption, of  course, double and 
triples.  So if the fan is 3 HP and the drain on the  battery is 186 amps, a 100 
amp-hr battery should, perhaps, be able to supply 5  minutes of power.  But then 
you'd have to recharge the battery for  over a half hour if you're using the 
Corvair's alternator.  But, at  the same time, you'd have to keep running 
cooling air through the  engine, so it would take lots longer to do both together. 
 Maybe you'd  need a SECOND battery to handle the short term load.
    Not an easy problem to resolve.
    Regards,
    Frank "trying to stay cool in 80+ deg. weather"  Burkhard   
 
In a message dated 8/2/2007 11:36:31 AM Eastern Daylight Time,  
sethracer at aol.com writes:

The  
electric fan I am looking for, and I know there are several others who  would 
be interested in it, would be a motor drive that would spin the  stock fan 
(or 
a re-designed mechanical fan) at the optimum RPM for  cooling. It would have 
to 
do that without adding too much weight - BUT -  it would only have to do it 
for about 5 minutes at a time (Think an  autocross run or two). I also 
wondered 
whether another gas motor - small,  maybe something like a weed eater or 
chain 
saw, could power the fan at the  optimum speed - or close enough. Now, that 
would attract some attention.  Before beginning your runs, you walk around to 
the 
rear and pull-start  your cooling fan drive engine. Or, better yet, have a 
starter drive  sticking up through the deck lid and use a wireless impact 
wrench to 
start  it. Cool! - Seth Emerson 







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