From: <Bahahud@aol.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Saturday, December 06, 2003 11:37 AM
Subject: [FlyRotary] Re: K&M and Thick Radiators


> A tip on thick radiators.
> I used 2 AC evaporator cores out of Lincoln town cars.
> I did not seal the grooves at the end of the radiators but just allowed
the
> aluminum air ducts to ride onthe edges leaving small air passages at each
> section.
> The result was 240 Deg. F. coolant temp. in climb.
> I then sealed these openings with RTV and in a full power climb to 3000
ft. i
> saw 180 Deg. F. coolant temps.
> The thick radiators MUST have sufficient stratic pressure to work
properly.
>
> Hank H.
>

Agree, Hank.  I've seen somewhere an estimate that a hole in a plenum with a
total area of approx 1/2" and you can lose 20% of your air mass cooling
effectiveness.  So seal those plenums.  I have fiberglass plenums that are
sealed to the core face inside with foam weather striping.  It do make a
difference.

Ed Anderson