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According to Rotax there is not a technical minimum cylinder temp but I
agree that we know that a warmer cylinder will be more efficient and the
crankcase and gearbox will not harbor water in the case.
The oil thermostat is one way to get up the oil temp. I have tried to
make a simple rear flap to close up the back but you would not believe
the pressure coming out of the rear of those radiators and the duct
suction pulling on the other side of the flap. A moveable cowl flap
will work, but then we're talking repaint of the cowl. So how do we get
the glycol temp up? Tape over 1/3 of the glycol cooler is a start.
Next is making a removable metal air dam in front of the glycol cooler,
but that is not adjustable. So what is needed is an adjustable flap
that can be set from the cockpit for those warmer winter days, spring
and fall operations or high altitude cruise operations.
Those adjustable slotted cooler shutters are a solution. Unless you
need every bit of cooling air in the summer like I do here in Florida.
Mark Ferkin of High wing LLC (Kitfox guy of fame) makes a shutter for
the Rotax coolers. It doesn't work well for our setup but the concept
works.
Van's aircraft has the slotted flap as addressed above and used on other
Northern Europa's but it does block the air needed for summer options.
For oil cooling, I have installed the oil thermostat and it is very
convenient and automatic so I'm waiting for it to fail...
I really have only one idea for a moveable Europa style XS coolers with
a two inch drop of the oil cooler. If you have one of my cockpit
heaters be sure to leave a cutout for the heater or the cockpit heat
gets shut off. See below:
Regards,
Bud Yerly
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Just a simple hinge setup with a flapper door to block the air
coming out of the glycol cooler and pivoted near the center to reduce
pull and hold forces. An oil cooler thermostat takes care of the oil
temps.
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I really thought this would work but the force to hold the flap
shut against the air outflow from the coolers (and draw of the cowl
ramp) is considerable for a hinged flap at the leading edge.
----- Original Message -----
From: graeme bird<mailto:graeme@gdbmk.co.uk>
To: europa-list@matronics.com<mailto:europa-list@matronics.com>
Sent: Sunday, November 25, 2012 1:06 PM
Subject: Europa-List: Re: SV: Running too cool, considering blocking
some of intake
<graeme@gdbmk.co.uk<mailto:graeme@gdbmk.co.uk>>
Thats very neat, thanks. I am wondering though if its really a
problem to be running at 80deg. I tend to get higher temps initially at
take off which would get rid of condensation etc. What happens when the
engine is running warmer? I cant see any particular reference in the
Rotax manual.
I guess I could just tape over half of it with aluminium tape and see
for now.
--------
Graeme Bird
G-UMPY
Mono 912S/Woodcomp 3000/3W
Newby: 45 hours
g@gdbmk.co.uk
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