REFLECTOR: Anyone flying a STD-RG with a single, rear mounted oil cooler?

[Douglas Holub]

I've got a fixed gear with a single oil cooler on the engine side of the
firewall and another oil cooler on the cabin side of the firewall for cabin
heat.  Running the cabin heater in the summer brings my oil temps down
about 10 degrees F.

I started out with a NACA under the belly for the engine oil cooler and
could only fly about 10 minutes before one of the cylinders was over 400
F.  So then I made a little scoop, and then I made a bigger scoop.  The
bigger scoop got me flying regularly, but even then I couldn't give it full
throttle in the summer time for more than 10 minutes or so before the
cylinder temps would start to get too hot.  So when I took the wings off
and brought the plane home to paint I made an even bigger scoop and hope to
try it out here in the next few weeks.  I'll send a picture.

Doug Holub
Standard FG w/ electric nose lift, 134 hours

On Mon, Aug 20, 2012 at 3:22 PM, Dave T Nelson <dtnelson at us.ibm.com> wrote:

> Winter is coming here in Minnesota, and so I'm thinking about what I want
> to plan for winter projects.  Klaus Savier has been after me for years to
> get rid of my nose mounted oil cooler and go to a single oil cooler in the
> rear.
>
> My current setup is with the roof mounted NACAs, and one "standard" cooler
> (in the nose).  My CHTs are reliably all low, particularly in cruise where
> my highest cylinder will be at around 340 (with the lowest as low as 260).
>   My oil temp is reliably around 200 - 210 in cruise on a warm day, and
> less than 200 on a cool day.  My issue is in long climbs.  I regularly fly
> out to the mountains, and also I like to go high (16K or more) when the
> winds favor.  In a full power sustained climb, say from takeoff to 12K, if
> I'm not careful I can easily get the oil to redline.
>
> So, in net, my cruise temps are fine, but my climb oil temp could be
> improved.
>
> Klaus is after me to move the oil cooler for drag reduction (not oil
> temp).  The large "NACA" in the nose along with the outlet ramp represents
> a sizeable amount of drag.  Less Drag = More Speed = Klaus.
>
> So... winter is coming, and I'm thinking of moving the cooler to get
> better cooling and to reduce drag.  But, before I get into a big mess...
>
> *What experience is out there regarding STD-RG IO-360 Velocities with a
> single oil cooler in the back?*
>
> Thanks!
>
> Dave
>
> Dave T. Nelson
> STD-RG N22DN
>
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