From: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: Update on Glasair Cooling in Phase #1
Date: Mon, 4 Nov 2019 05:42:24 +0800
References: <list-13136618@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-13136618@logan.com>
Message-Id: <604649C4-1507-4C24-BF81-3B9652B0EDFB@gmail.com>

Sorry Matt, I just realised I hadn=E2=80=99t mentioned the actual oil =
temps.
Highest in climb were 114C (237F) settling back to 110C this is 10C =
higher than previous flight?? OAT was up 4C ~7F
I would have expected a symbiotic relationship between oil and water =
temps. Lower coolant yielding lower oil temps.
This is troubling me, Prior to this flight I noticed oil level down on =
the stick. Its always been very consistently full  with no signs of =
leaks etc. (Standard Renesis pan)
It=E2=80=99s running Mobile 1 and measuring the oil entering the engine =
after cooler and filter.

Steve

> On 3 Nov 2019, at 11:35 pm, Matt Boiteau mattboiteau@gmail.com =
<flyrotary@lancaironline.net> wrote:
>=20
> Coolant looks great. Are you running a t-stat?
> What are the oil temps when you say "high"? Synthetic? Weight? Oil pan =
or inlet temp location?
>=20
> This is my opinion, with synthetic 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.
>=20
> I do agree you might have to open up to 100mm (4 inch) for oil cooler.
>=20
> - Matt Boiteau
>> On 2019-11-03 8:31:47 AM, Stephen Izett stephen.izett@gmail.com =
<flyrotary@lancaironline.net> wrote:
>>=20
>> Hi there people=20
>>=20
>> Over the past month I have updated the cooling system of the Glasair =
Super II RG in order to continue our phase 1 testing.=20
>>=20
>> The previous setup had 540in3 two pass behind the ~20in2 unmodified =
right cheek inlet.=20
>> 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.=20
>> The Oil is 250in3 behind a 8in2 under spinner inlet.=20
>> Initial testing was marginal with OAT below 20C (68F)=20
>> So having established that cooling was rather marginal above 68F I =
went for the planned upgrade path which included=20
>> installing a secondary bike radiator of 130in3 plumbed into the =
heater circuit behind the ~15in2 left cheek inlet.=20
>> The diffuser was designed to hopefully be more efficient in a climb =
configuration.=20
>> So the total radiators frontal area has been increased by 50% while =
the air in has increased 75%.=20
>> 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.=20
>>=20
>> Testing on the ground yield an approx 15-20C drop in coolant after =
30mins of 1800rpm idle.=20
>>=20
>> Flight Testing Results the next day: OAT 21C (70F)=20
>> Coolant Temps max=E2=80=99d on climb at 93C (200F) down 15C on =
highest Flight 3 climb temp with a 4C higher OAT.=20
>> Coolant Temps dropped to 83C (181F) as speed got to 147 KIAS (Cruise =
is published as 192 KIAS but we haven=E2=80=99t expanded the envelope to =
date)=20
>> I=E2=80=99m very pleased with this result.=20
>>=20
>> Oil Temps are high. I would much prefer them below 80C (176F)=20
>> 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)=20
>>=20
>> Slow Speed Tests:=20
>> Vs Clean Stall is at 67 KIAS row 2011 (Glasair claims 70 Knots at =
Gross)=20
>> Vso Full Flap Stall is at 57 KIAS row 2062 & 2083 (Glasair claims 59 =
Knots at Gross)=20
>>=20
>> Cheers=20
>>=20
>> Steve Izett=20
>> Perth Western Australia=20
>>=20
>>=20
>>=20
>>=20
>>=20
>>=20
>>=20
>>=20
>> --=20
>> Homepage: http://www.flyrotary.com/=20
>> Archive and UnSub: =
http://mail.lancaironline.net:81/lists/flyrotary/List.html=20