Paul,

I recently mistakenly deleted a thread about oil heat exchanger capacity
sizing that you had posted about one month or so ago.  In it Dave
remarked he was flying with a Setrab 2" by 11" X 15" ??? model and
then had 20 square inches of that taped off, but had a good dedicated
air scoop to the system.

I recently bought a second 20B oil cooler and wonder if I need to mount
both of them for a 300 hp 13B.  I plan to have dedicated air ducts and
cowl flaps of course.
The oil cooler core size (minus the end tanks)  is 120mm x500mm x 50mm
or 4.7" x 19.7 x 2"

That is 185 cubic inches.  Times two is 370 cu. in.

Doug in Japan


It will be awhile before I can access old messages.
Perhaps in a day or so. I upgraded the hard disk from 160 gig to 300 gig
and the OS from Fedora 5 to Fedora 8 so I have to copy a lot of files
over from the old hard disk. So far I like the improvements in Fedora 8.
There were a few glitches but nothing serious.

The 185 ci works well for a 2 rotor so two of them ought to be fine
for a 3 rotor.

Paul Lamar
--

Paul

Thanks.


Say, a thought occured to me about oil drainback from the PSRU during
decent.  I would think oil would rush into the PSRU from the oil pan as
the scvanger pipe is at least 1/2" in diameter and leads to the top of
the oil pan. Has anyone experience a problem with this?

Doug in Japan


That would be more like a power on dive than a decent. It is rather surprising how little the pitch changes with decent if you
just pull the power. One of the reasons is the angle of attack increases as the aircraft slows.

Paul Lamar


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