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?
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.
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 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
--
Homepage: http://www.flyrotary.com/
Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html