Paul,
Has there been any reference data to calculate the necessary volume of the
swirl tank? How do you decide if you need one? It looks like some have them and
some don't.
Thanks
Dean

Most automotive systems don't use swirl tanks and they work quite well.
I am going to try it with out and just copy an automotive system exactly.
After all, billions of dollars have gone into developing automotive
cooling systems. If it will work for a 6000 pound truck pulling a 
7000 pound load up an 8% grade in So Cal at 65 MPH  on a 100 F 
day it will work for an airplane.

People flying use all sorts of different plumbing systems. I cannot at this
time identify why some plumbing systems work well and others don't.
It is buried in too many other factors.

I CAN see why some cooling system don't work for aerodynamic reasons 
and that problem  appears to be at the top of the list. In that 
category having the back side of the rad too close to an object 
seems to be the main reason. Second is not having enough 
air outlet area for the cowl. Third is having a poorly shaped 
inlet duct. Having a radiator that is too small is way down 
the reason list. Most are too large given all the other mistakes. 
The exact plumbing system used is probably at the bottom 
of the reason list.

We still have not got to the point where we are considering cooling
drag as nobody is yet using cowl flaps to my knowledge.

This is the way I see it now.

Paul Lamar
 
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