> >>  Jerry,
 > >>
 > >>    I think you got that wrong on the inlet. By putting a windmilling

fan in

 > >>  the duct you've created a flow restriction. I think with the fan

installed

 > >>  you'll need a BIGGER scoop, not a smaller one. Grab that fan and

stick it

 > >>  out your car window while you're zooming down the road at 125MPH

and try to

 > >>  hang onto it and I think you'll see what I mean.
 > >>
 > >>  Mike Wills

 > >I don't think it will see that speed in the duct.
 > >
 > >Paul Lamar

 > Mike, my fan is a pull through  on the opposite side of the rad from
 > the inlet duct and rad plenum.
 > The intake scoop has a volume that is roughly 1/3 the volume of the
 > rad plenum so I think the air will not be moving that fast.    On the
 > exit side of the rad,  you have the entire interior volume of the
 > fuselage.     Air entering the scoop at 200 m.p.h. will slow to 66mph
 > at the rad face and then slow even more on the exit side.  While I am
 > not going to blame anyone else if this does not work,  credit for the
 > design of my cooling system goes to many members of this group
 > particularly Paul and Bill Freeman who probably don't even remember
 > the excellent engineering they freely provided while this design was
 > coming together.    --Jerry

I don't think you can count on the volume of the fuselage to make any
difference at all. The velocity of the air flowing through the fan is
porportional to the volume and inversely porportional to the cross section
area OF THE FAN. If anything, a larger volume behind the fan will tend to
reduce the pressure, which will allow more volume and INCREASE the fan
speed.

I'm not an engineer, so this is just my intuitive understanding. You
engineers out there, please correct me if I am wrong.

Dick Gregory

It will make a difference if the * cross sectional area * of the exit duct is 
too small. The volume per se has nothing to do with it. I think Jerry is mis 
using the term volume. I think what he meant to say was he had plenty of
exit duct area.

Paul Lamar

 
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