Received-SPF: softfail
 receiver=logan.com; client-ip=64.102.122.148; envelope-from=echristley@nc.rr.com
Message-ID: <44D775DC.2020301@nc.rr.com>
Date: Mon, 07 Aug 2006 13:18:20 -0400
From: Ernest Christley <echristley@nc.rr.com>
Reply-To: echristley@nc.rr.com
User-Agent: Mozilla Thunderbird 1.0.7-1.4.1 (X11/20050929)
MIME-Version: 1.0
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Oil cooler location.
References: <list-1311337@logan.com>
In-Reply-To: <list-1311337@logan.com>
Content-Type: multipart/mixed;
 boundary="------------060301010107080004010205"

This is a multi-part message in MIME format.
--------------060301010107080004010205
Content-Type: text/plain; charset=windows-1252; format=flowed
Content-Transfer-Encoding: 8bit

Joe Hull wrote:

> It was bugging me that I couldn’t remember the reference to the 
> reverse scoop – so here’s the link – it was Dick Rutan:
>
> http://www.ez.org/cp47-p11.htm
>
> Essentially put the reverse scoop on the top of the wing all the way 
> ahead of the oil cooler for best cooling.
>
I looked at the drawing and thought that exposing the oil cooler like 
that would be very dangerous. You need some way to keep kids at the 
flyins from seeing if they can "hit the basket". I imagined the design 
concept pasted below. Try very hard to imagine that it's a wing 
crossection with an embedded oil cooler (the black box). The circular 
thingy would be a rotating drum, with slices taken off of two sides. The 
drum would rotate, controlled with a bowden cable, to open and close 
both the entrance and exit simultaneously. A broken cable would have the 
drum forced open for full cooling. Works as a flap and protects the 
cooler on the ground. Proper dimensioning left as an exercise for the 
reader.

Kelly is correct concerning my project, except that my intakes are not 
flush. I could possibly get away with flush intakes, but it is easier to 
cut back than it is to add so I let it drop out the bottom a short bit. 
My shark gill louvers have turned out really nice, but need a little 
more cosmetic attention. My biggest concern was filling the fuselage 
with water when the airplane is on the ramp in the rain as the exits are 
on top. I've got to add a drain hole on the bottom for blowing rain, but 
I believe I'll be keeping 95% of the water out.

Having the oil cooler in the strake is offering another benefit. I'm 
adding a door to the center of the cooler's exit duct that hinges into 
and out of the duct from the side. This door cuts the cooler neatly in 
half. A 1.75" hose exits from the intake duct in front of the cooler, 
and another exits from behind the cooler but in front of the door. A 
1.75" hose will exit the air from the cockpit back at the wheel well 
portion of the duct. Normal operation is to have the cooler door wide 
open and take cabin cooling air from in front of the oil cooler. Cabin 
air flow will be set by the pressure differential across the cooler 
core. When it's really cold, and I need cockpit heat (but not so much 
oil cooling), I close the door and cabin cooling vent, while opening the 
cabin heat vents. Closing the door will increase the static pressure at 
the cabin heating port on the cooler exit duct, commissurate with the 
pressure on the face of the cooler. The air still exits out the back. 
Basically, by putting the oil cooler in the strake, I've been able to 
get cabin heat and a way to reduce cooling drag in one mechanism that is 
much lighter than other solutions (no extra fans, heat exchangers or 
muffler heat muffs) For me, the only extra complexity in construction 
was a piece of round foam taped to the side of my oil cooler mold. The 
only question is will it work.


-- 
         ,|"|"|,              Ernest Christley       |
----===<{{(oQo)}}>===----    Dyke Delta Builder      |
        o|  d  |o        http://ernest.isa-geek.org  |


--------------060301010107080004010205
Content-Type: image/png;
 name="drumflaps.png"
Content-Transfer-Encoding: base64
Content-Disposition: inline;
 filename="drumflaps.png"
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==
--------------060301010107080004010205--