Mailing List flyrotary@lancaironline.net Message #5073
From: Ed Anderson <eanderson@carolina.rr.com>
Subject: Re: [FlyRotary] oil cooler scoop area?
Date: Thu, 1 Jan 2004 21:26:24 -0500
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Message
----- Original Message -----
Sent: Thursday, January 01, 2004 8:18 PM
Subject: [FlyRotary] oil cooler scoop area?

Greetings,
 
As I grind through the rev-2 details, I still need to come up with a place, for the oil cooler.  It will have to go on the bottom of the cowl, and I don't see any way to use the stock carb scoop that's already down there (only 7 cu in inlet), so I'll have to get rid of that, and come up with a new scoop.  Anyway, I was wondering what the ballpark size of the scoop should be. 
 
Each cowl cheek inlet is about 24 cu in, so logic would suggest that I start with the same size for oil cooler.  The cooler will likely be mounted very close to the cowl bottom (to get away from the exhaust pipe above) so the ducting will primarily be built into the scoop.  Any ballpark figures for the inlet will be appreciated. 
 
Cheers,
Rusty (lightened the motor mount today)
 
 
You've got it in the right ball park, Rusty.  I also eliminate the stock cowl air intake and put my oil scoop there.   See my oil scoop, it is 10.5" wide and averages 2 .5" high for around 26 square inches.  An Aussie, Ian ,appears to get away with a bit smaller inlet (his the white bird).  I suggest making the bottom lip with a bit of a smooth airfoil like entrance to ensure that when you have the nose up in a climb that air will still be induced to flow around the lip and into your scoop.
 
Ed
 
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
eanderson@carolina.rr.com
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