From: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
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Subject: Cooling Mods to Glasair
Message-Id: <66D5ECB1-B441-4222-9ACD-DD42DBD3AEC6@gmail.com>
Date: Fri, 20 Nov 2020 18:27:45 +0800
To: Rotary motors in aircraft <flyrotary@lancaironline.net>

Hi Guys

I thought I should provide  an update.

Having installed 5 differential pressure transducers and interfaced them =
via spare Dynon EGT inputs, Ive been collecting some H2O diffuser =
pressure data.

First tests took pressure readings at 5 points (4 taps, 4 inches in from =
the four corners and one in the middle) referenced to the ships Static =
system.
Today I changed those taps to reference the pressure directly across the =
core at these same locations.

This has revealed the importance of measuring the pressure across the =
radiator as the pressures behind the radiator is not at all equal.

The data has revealed that our wedge diffuser was not equally =
distributing the air pressure across the radiator face very well at all.
Far more air was going through the back area as others have reported in =
the past.

So we will reshape the diffuser wall, making it harder for the air to =
get to the back and retest.

We have also increased the Oil inlet area from ~9in2 to ~ 14in2 and this =
has improved the oil temps.
On a flight today OAT of 79F on climb out Oil and H2O temps peaked at =
210F.

I=E2=80=99m very happy with the changes and expect to get further =
improvements, and will shortly turn our attension to mechanising the =
cowl flaps to get temps up and cooling drag down in the cooler air.

Cheers

Steve Izett
Glasair Super IIRG Renesis 4 port RD1C, EC2, EM3=