Received-SPF: pass
 receiver=logan.com; client-ip=24.25.9.100; envelope-from=eanderson@carolina.rr.com
Message-ID: <000301c734b8$4b948580$2402a8c0@edward2>
From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-1748432@logan.com>
Subject: Re: [FlyRotary] Re: Great day to fly
Date: Wed, 10 Jan 2007 08:07:34 -0500
MIME-Version: 1.0
Content-Type: text/plain;
	format=flowed;
	charset="iso-8859-1";
	reply-type=original
Content-Transfer-Encoding: 7bit

I agree, Bob.  If your "going out" area is impeded then it will certainly 
have as much adverse impact as too small an intake.  Yes, I have a 
fiberglass plenum that goes from the opening to the stock Mazda cooler.  I 
then seal it against the core with rubber gaskets.  From what I have read, 
even  leak areas as much as 1 -2 cubic inch can materially affect your 
cooling - sounds hard to believe, but that is what I have read.

It took me about 5 iterations to get the oil cooler problem fixed, then all 
of my temperatures settled down into the "good" range.  Keep at it, you'll 
get it solved.

Ed

----- Original Message ----- 
From: "Bob White" <rlwhite@comcast.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Wednesday, January 10, 2007 12:19 AM
Subject: [FlyRotary] Re: Great day to fly


> 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/
>
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:   http://mail.lancaironline.net/lists/flyrotary/