From: "Matt Boiteau mattboiteau@gmail.com" <flyrotary@lancaironline.net>
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Date: Sun, 03 Nov 2019 10:35:20 -0500
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Subject: Re: [FlyRotary] Update on Glasair Cooling in Phase #1
To: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
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Coolant looks great. Are you running a t-stat?
What are the oil temps when you say "high"? Synthetic? Weight? Oil pan or i=
nlet temp location?


This is my opinion, with synthetic 20W50 at oil pain temps, I'd be okay dur=
ing the climb with 240F and hopefully after some air speed it drops down un=
der 220F.

I do agree you might have to open up to 100mm (4 inch) for oil cooler.

- Matt Boiteau
On 2019-11-03 8:31:47 AM, Stephen Izett stephen.izett@gmail.com <flyrotary@=
lancaironline.net> wrote:
Hi there people

Over the past month I have updated the cooling system of the Glasair Super =
II RG in order to continue our phase 1 testing.

The previous setup had 540in3 two pass behind the ~20in2 unmodified right c=
heek inlet.
We hadn=E2=80=99t included the left cheek as it was so difficult to get the=
 air across to the right hand side diffuser.
The Oil is 250in3 behind a 8in2 under spinner inlet.
Initial testing was marginal with OAT below 20C (68F)
So having established that cooling was rather marginal above 68F I went for=
 the planned upgrade path which included
installing a secondary bike radiator of 130in3 plumbed into the heater circ=
uit behind the ~15in2 left cheek inlet.
The diffuser was designed to hopefully be more efficient in a climb configu=
ration.
So the total radiators frontal area has been increased by 50% while the air=
 in has increased 75%.
The unknown is that being in the heater circuit we don't know the total flo=
w through the secondary rad compared with the primary rad.

Testing on the ground yield an approx 15-20C drop in coolant after 30mins o=
f 1800rpm idle.

Flight Testing Results the next day: OAT 21C (70F)
Coolant Temps max=E2=80=99d on climb at 93C (200F) down 15C on highest Flig=
ht 3 climb temp with a 4C higher OAT.
Coolant Temps dropped to 83C (181F) as speed got to 147 KIAS (Cruise is pub=
lished as 192 KIAS but we haven=E2=80=99t expanded the envelope to date)
I=E2=80=99m very pleased with this result.

Oil Temps are high. I would much prefer them below 80C (176F)
I=E2=80=99ll be interested to see what oil temp does as speed rises, but my=
 hunch is it needs more air (increase air to oil cooler from a diameter of =
77mm to 100mm)

Slow Speed Tests:
Vs Clean Stall is at 67 KIAS row 2011 (Glasair claims 70 Knots at Gross)
Vso Full Flap Stall is at 57 KIAS row 2062 & 2083 (Glasair claims 59 Knots =
at Gross)

Cheers

Steve Izett
Perth Western Australia


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<body><div id=3D"__MailbirdStyleContent" style=3D"font-size: 10pt;font-fami=
ly: Arial;color: #000000">
                                        Coolant looks great. Are you runnin=
g a t-stat?<br>What are the oil temps when you say "high"? Synthetic? Weigh=
t? Oil pan or inlet temp location?<br><br><div>This is my opinion, with syn=
thetic 20W50 at oil pain temps, I'd be okay during the climb with 240F and =
hopefully after some air speed it drops down under 220F.<br><br>I do agree =
you might have to open up to 100mm (4 inch) for oil cooler.</div><div><br><=
/div><div class=3D"mb_sig">- Matt Boiteau</div><blockquote class=3D"history=
_container" type=3D"cite" style=3D"border-left-style:solid;border-width:1px=
; margin-top:20px; margin-left:0px;padding-left:10px;">
                        <p style=3D"color: #AAAAAA; margin-top: 10px;">On 2=
019-11-03 8:31:47 AM, Stephen Izett stephen.izett@gmail.com &lt;flyrotary@l=
ancaironline.net&gt; wrote:</p><div style=3D"font-family:Arial,Helvetica,sa=
ns-serif">Hi there people=0D<br>=0D<br>Over the past month I have updated t=
he cooling system of the Glasair Super II RG in order to continue our phase=
 1 testing.=0D<br>=0D<br>The previous setup had 540in3 two pass behind the =
~20in2 unmodified right cheek inlet.=0D<br>We hadn=E2=80=99t included the l=
eft cheek as it was so difficult to get the air across to the right hand si=
de diffuser.=0D<br>The Oil is 250in3 behind a 8in2 under spinner inlet.=0D<=
br>Initial testing was marginal with OAT below 20C (68F)=0D<br>So having es=
tablished that cooling was rather marginal above 68F I went for the planned=
 upgrade path which included=0D<br>installing a secondary bike radiator of =
130in3 plumbed into the heater circuit behind the ~15in2 left cheek inlet.=
=0D<br>The diffuser was designed to hopefully be more efficient in a climb =
configuration.=0D<br>So the total radiators frontal area has been increased=
 by 50% while the air in has increased 75%.=0D<br>The unknown is that being=
 in the heater circuit we don't know the total flow through the secondary r=
ad compared with the primary rad.=0D<br>=0D<br>Testing on the ground yield =
an approx 15-20C drop in coolant after 30mins of 1800rpm idle.=0D<br>=0D<br=
>Flight Testing Results the next day: OAT 21C (70F)=0D<br>Coolant Temps max=
=E2=80=99d on climb at 93C (200F) down 15C on highest Flight 3 climb temp w=
ith a 4C higher OAT.=0D<br>Coolant Temps dropped to 83C (181F) as speed got=
 to 147 KIAS (Cruise is published as 192 KIAS but we haven=E2=80=99t expand=
ed the envelope to date)=0D<br>I=E2=80=99m very pleased with this result.=
=0D<br>=0D<br>Oil Temps are high. I would much prefer them below 80C (176F)=
=0D<br>I=E2=80=99ll be interested to see what oil temp does as speed rises,=
 but my hunch is it needs more air (increase air to oil cooler from a diame=
ter of 77mm to 100mm)=0D<br>=0D<br>Slow Speed Tests:=0D<br>Vs Clean Stall i=
s at 67 KIAS row 2011 (Glasair claims 70 Knots at Gross)=0D<br>Vso Full Fla=
p Stall is at 57 KIAS row 2062 & 2083 (Glasair claims 59 Knots at Gross)=0D=
<br>=0D<br>Cheers=0D<br>=0D<br>Steve Izett=0D<br>Perth Western Australia=0D=
<br>=0D<br>=0D<br>=0D<br>=0D<br>=0D<br>=0D<br>=0D<br>=0D<br>--=0D<br>Homepa=
ge:  http://www.flyrotary.com/=0D<br>Archive and UnSub:   http://mail.lanca=
ironline.net:81/lists/flyrotary/List.html=0D<br></div></blockquote>
                                        </div></body>
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