Peter Nunn wrote:
The aircraft is an experimental. it is a low wing all-metal tricycle with
retractable undercarriage. I have a stock oil-cooler and turbo
intercooler.
The colwing has lots of room to the side of the engine but none aboe or
below the engine as the cowling line is very low at the top and the
retract
mechanism is only 10mm below the sump.
I can send a DXF of the engine mount/cowling if that helps
Yes that would help. Sounds like you need two water rads one on either
side of the engine plumbed in parallel. I will have to put my
thinking cap on after I get the DXF. What version of ACAD is it?
Wait a minute. I know what you can do. You can copy Jim Rahm's
layout. Here is a picture. Intercooler and all. A is the intercooler
and B is the water radiator. Since he is using two intercoolers
and dual turbo's the same set up is on the other side. Jim uses
fans on the water rads for climb. This is the ultimate oblique
flow radiator set up. Jim is cooling 420 HP and he is going
330 MPH. Finished second behind the factory Lancair in the
NC to OSH race. Nearly beat them. No small feat.
Paul Lamar
Peter Nunn wrote:
Thanks paul, I use TurboCAD and am preparing a DXF file export now.
I was thinking of a dual setup much like the info in the acre site. The
chart showing the heat distribution was very helpfull. If I read it
correctly a 134kw [180 HP] engine will produce 115kw of waste heat [155 HP]
in a combined oil/water cooling system.
I therefor will need a radiator setup that can
handle at least that and probable 50% more at my best angle of climb. Do
you have any info of the air volume/heat transfer for your radiator design?
No I wish I did. I am not competent enough in heat exchanger theory to figure
that sort of thing out. I am guessing based on what has worked
for others. Ron Davis says he will test it so I will upload
the data when that happens. In the mean time contact Krieger Publishing
in Malabar Fl and purchase a copy of Compact Heat Exchangers by
W.M. Kays and A.L. London. This appears to be the bible of heat exchangers.
Fortunately still in print.
I guess one could rig something up with free cast off furnace blowers and test
the rad. The problem is getting enough hot water to do this.
Long time ago we were going to get a Mazda 13B rotary pick up truck,
load down the engine with a trailer and mount a rad in a duct up
above the cab and instrument the whole rig. Big project and other
things got higher priority. BTW The automotive industry is still
doing full scale on the road testing.
Perhaps the thing to do is cut a rad down to only half a dozen tubes
six inches long, use a re-circulating water heater, electric pump and furnace
blower to check a small section for air pressure drop, air flow volume,
water flow volume, water pressure drop and water temperature drop. Then
extrapolate to full size.
I have an old water heater that had a minor leak in a valve that we
threw out because it was ten years old so used ones should be cheap.
Paul Lamar
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