The distance of the exit duct wall behind the rad must be 50% of
the length of the rad. That is a lot of exit duct volume! Here is the chart
from Kuchemann & Weber. Read rad core for "block" in K&M speak.

Gotcha Paul, no trouble understanding K&W speak...just don't want to!
Talk about read'em and weep. Even their worst case would require an
extra inch of outlet depth. The gill style exits are looking better all the
time! I have another idea that looks good more along the idea you like
with the outside exit. I'll send it along tomorrow. Your comments are
appreciated, there is no way I'll take off with inadaquate cooling. I like
to think I can engineer the solution. Not witch doctor it. This seems to
be the area least well understood to modern experimenters.
Thanks again, Bill Jepson

I'll be glad to loan you my car top test rig if you pay shipping.
Perry has the companion water manometer right at the moment.

Paul Lamar

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