Paul wrote:

We may have a minor rad breakthrough here. I am talking to Ron Davis
about building some rads for us. He does not know they are for aircraft
yet so don't tell him. He does know they are for rotaries.

We had good communication because  of my racing experience. He was a fan
of Chaparral as a kid back in the 60's :-)
What I will be asking for is 16 inches wide about 20 inches long
cross counter flow rad two pass rad. As per this sketch. Any comments?
any other request. I can get the price down if he feels he can sell more.

Russell Kent volunteered:

I don't think it makes a difference in the design, but be certain to tell him
that the airflow is from right to left (on the drawing).

Paul responded:

No need to know :-) I would have to kill him if I told him :-)

Paul,
Funny Paul, but I was serious.  Even in a mountain racer (or whatever fabrication
you told him) there is airflow.  I regard radiator design as part engineering, part
black magic.  I don't think it makes a difference in the *design* which way the air
flows, but it certainly makes a difference in the *operation* of the radiator.
Since I am *not* certain the air flow direction makes a difference to the design,
but since we know which way we want the air to flow (for operational reasons), then
it makes sense to let the designer/fabricator know that the airflow is going to be
from right to left, i.e. downstream radiator portion gets the cooler air before the
upstream portion.

I fail to see how telling him the air flow direction through the radiator tips your
hand as to the end use of the radiator.

Russell Kent

It does not Russell but he understands cross counter flow. He just does
not believe in it yet.

Here is the drawing.

Paul Lamar
 
The Aircraft Rotary Engine Newsletter.              Powered by Linux.

http://home.earthlink.net/~rotaryeng/            http://www.linux.org