Perry Mick wrote:
I moved the oil cooler inboard to the armpit location and closed up
the
holes in the cowl on top and bottom. Weather opened this morning so I
could
climb to 4500 feet. Cruised around at 5400 RPM, oil temp 180, coolant
temp
1/4 on the idiot Mazda gauge. 13C morning. I have never seen temps
this
low
at this higher power setting. Lesson learned: do not use a 12A oil
cooler on
a 13B, even if it looks the same. Hopefully I can fly around now in
the
hotter climates next summer. Attached are some photos.
Notice in the photos also, that I lowered the coolant rad leading
edge,
the
air is split about 2/3 to the rad and 1/3 over the engine and finned
oil
pan. The rear of the coolant rad is raised slightly to improve flow
into
the
ductfan. After moving the oil cooler inboard and closing the cowl
holes
I
gained another 50 RPM on climbout, 5270 now at 90 knot climb. The
ductfan
inlet seems to be very sensitive to obstructions.
Perry
Perry,
Although I'm always interested in your progress, I didn't realise you
were
trying to use a 12A oil cooler on a 13B.
Previous discussions suggested they weren't up to the task, but I assumed
you thought it would be OK with reduced RPM?
Just imagine how much cooler a 12A will run with a 13B cooler - I will
have
to remember that!!.
That duct looks like a fighter jet intake, so pulling in the boundary
layer
doesn't seem to affect it ?
George (down under)
I would not say that George :)
BTW I am not sure that is a 12A oil cooler. My 83 RX7 had a water to
oil cooler under the filter.
Paul Lamar
George, you are talking about the oil cooler inlet? Yes, there is not much
choice in what that looks like. I didn't implement a boundary layer bypass
because it would just lower the oil cooler that much more.
The only first gen to use that oil to water cooler was the 1983. The oil
cooler I had in my plane was a 1982, looks very much like the 2nd gen oil
cooler and is the same size. I had two different 1982 oil cooler in my plane
and they both behaved the same.
Perry
Yes but you also changed the duct at the same time :)
Paul Lamar
The AirCraft Rotary Engine NewsLetter. Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/
Copyright 1998-2003 All world wide rights reserved.