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Date: Tue, 9 Jan 2007 22:19:00 -0700
From: Bob White <rlwhite@comcast.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Great day to fly
Message-Id: <20070109221900.f7374a3b.rlwhite@comcast.net>
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Hi Ed,

Well, I've found a way to make it not work.  :-)  That's about where
mine is but I have the PL MM plate so the whole area behind the cooler
is pretty well blocked off about 5" back.  My cooler is actually a
little higher, but the opening is just below the spinner.  Besides that,
the bottom area is blocked off by the evap core mounting brackets.  The
opening feeding the oil cooler is about 13 X 1.9 so it sound like if I
had a little more room behind the oil cooler I would be OK.  I'll bet
that if I could open up the area below the MM plate it would work a lot
better. One of my other plans is to rebuild the MM in the Schertz Beam
configuration and go back to Tracy's plate for the redrive.

Do you have a sealed plenum from the opening to the oil cooler? If so,
how long is it.  I'm assuming you're using the stock RX-7 oil cooler
that's about 22 X 4 1/2.

I'm actually a little surprised my water cooling is working as well as
it is.  The center 1/3 of the area fed by the water cooling plenum is
an aluminum plate.  It covers the area where the plumbing is in the
photo I sent earlier.  The opening feeding that area is 13 X 3.8.

Bob W.  (More stuff to think about!)


On Tue, 9 Jan 2007 22:09:00 -0500
"Ed Anderson" <eanderson@carolina.rr.com> wrote:

> Hi Bob, glad you had a nicer flight and got to enjoy it.
> 
> My challenge was the oil cooler as well. I originally had it installed 
> approx 10-11inches from the firewall mounted parallel to the firewall.  I 
> ended up with a 5" dia duct feeding the oil cooler plenum and it was still 
> marginal anytime the OAT got above 87F.  I finally ended up moving it up 
> under the spinner with a 2 1/2" x 10"  (25 sq inch opening) and my oil temp 
> dropped 25-30F.  That also caused my coolant temps to decrease.
> 
> So far, it appears the under the spinner for a tractor works in every case. 
> A number of RV types have used it including myself, Jim Mosur, Bill Eslick, 
> Ian (Aussie), and others and it appears to do the job.  Don't know how 
> viable such a mod would be for your installation.
> 
> Ed
> ----- Original Message ----- 
> From: "Bob White" <rlwhite@comcast.net>
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Sent: Tuesday, January 09, 2007 9:38 PM
> Subject: [FlyRotary] Re: Great day to fly
> 
> 
> > Hi John,
> >
> > I have two evap cores attached to the motor mount plate and angled back
> > about 60 degrees.  The first photo shows one radiator installed and
> > the second show the plumbing between the two.  The water cooling sort
> > of works, but my real problem is the oil cooling.  The back side of the
> > oil cooler is about 5 inches from the MM plate.  The top of the cooler
> > is just below the starter.  There just isn't enough room to let the air
> > flow thru it.
> >
> > The other nightmare I've had with this setup is - what if something
> > shorted the starter cable to the oil cooler?  Sparks and 80 psi oil
> > spewing out would make one hell of a fireball.  (I have a vivid
> > imagination.)
> >
> > I'm going to get some time in the air while the weather is cool, and
> > redo the cooling system this spring.
> >
> > Bob W.
> >
> >
> >
> > On Tue, 9 Jan 2007 20:20:12 -0500
> > "John Downing" <downing.j@sbcglobal.net> wrote:
> >
> >> Bob;  What is the set up on your radiators.  I'm working on my 
> >> installation and planning on the round holes within one inch of the prop 
> >> and with diffusers.  Hole diameter is planned at 4 3/4"s.  I have the 2 
> >> 1/2" x 10" opening with diffuser like Ed has for the oil cooler.  JohnD
> >
> >
> > -- 
> > N93BD - Rotary Powered BD-4 - http://www.bob-white.com
> > First Flight:  11/23/2006 7:50AM - 1.7 Hours Total Time
> > Cables for your rotary installation - http://www.roblinphoto.com/shop/
> >
> 
> 
> --------------------------------------------------------------------------------
> 
> 
> > --
> > Homepage:  http://www.flyrotary.com/
> > Archive and UnSub:   http://mail.lancaironline.net/lists/flyrotary/
> > 
> 
> 
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:   http://mail.lancaironline.net/lists/flyrotary/


-- 
N93BD - Rotary Powered BD-4 - http://www.bob-white.com
First Flight:  11/23/2006 7:50AM - 1.7 Hours Total Time
Cables for your rotary installation - http://www.roblinphoto.com/shop/