Ed Anderson wrote:

----- Original Message -----
From: "ACRE" <rotaryeng@earthlink.net>
Sent: Tuesday, September 09, 2003 2:39 AM

Ed, I wasn't with the group when you first described your system
so bear with me. Are you exhausting through the side loovers?
or down into the cowl?
Bill Jepson

Actually, both, Bill.  My total inlet area (radiators and oil cooler) before
the reduction on the one was 72 square inches.  The common wisdom says (or
at least it use to) you need an exit area somewhere around 1.5-1.7 ratio
over inlet area.   The bottom cowl opening is 28" x 4.5" which gives 126
square inches or a ratio of 126/72 = 1.75.  So I am fairly certain that the
majority of the hot air exits out the bottom.  The louvers were placed on
the sides of the cowl waaayyyyy back when I was having over temp problems on
the ground.  I noticed the cowl got too hot to touch after shut down with no
way for the hot air to readily depart.  So I put in the louvers which helped
that situation - but may do nothing much in flight.

I plan on taping over the louvers with duct tape and see how much difference
( if any) it makes inflight temp control

Ed Andrson

 
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