From: "Neil Unger 12348ung@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Update on Glasair Cooling in Phase #1
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Date: Mon, 4 Nov 2019 07:34:00 +1100
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Steve,

                    Oil is quite happy at 95 c and higher, but cruise 
temp at 90 - 95 are no problem.. Most thermostats hold engine 90 to 95 
degrees.  Neil.

On 11/4/2019 12:20 AM, Stephen Izett stephen.izett@gmail.com 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 cheek inlet.
> We hadn’t 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 circuit behind the ~15in2 left cheek inlet.
> The diffuser was designed to hopefully be more efficient in a climb configuration.
> 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 flow through the secondary rad compared with the primary rad.
>
> Testing on the ground yield an approx 15-20C drop in coolant after 30mins of 1800rpm idle.
>
> Flight Testing Results the next day: OAT 21C (70F)
> Coolant Temps max’d on climb at 93C (200F) down 15C on highest Flight 3 climb temp with a 4C higher OAT.
> Coolant Temps dropped to 83C (181F) as speed got to 147 KIAS (Cruise is published as 192 KIAS but we haven’t expanded the envelope to date)
> I’m very pleased with this result.
>
> Oil Temps are high. I would much prefer them below 80C (176F)
> I’ll 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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