REFLECTOR: Nose oil cooler outlet?

[Brent Bourgeois]

Don,
You will need the lip on the outlet to create enough low pressure behind the cooler. The inlet, NACA or otherwise will get plenty of air in. In fact it will stagnate ,build pressure to a point and stop going in the inlet. My experience ( lots of flights with a manometer ) show the outlet size, lip to be the most important thing in reducing the back pressure behind the cooler.

 Brent
N61VB
STD RG
 

--- On Sun, 5/3/09, Don Johnston <don at numa.aero> wrote:

From: Don Johnston <don at numa.aero>
Subject: REFLECTOR: Nose oil cooler outlet?
To: reflector at tvbf.org
Date: Sunday, May 3, 2009, 10:34 AM








There seem to be two theories when it comes to the nose oil cooler outlet:
 
A)     Outlet flush with the fuselage.
B)      Build up the leading edge of the outlet an inch or so to increase the vacuum.
 
Does anyone have any real world comparisons? Those of you with flush outlet, are you seeing sufficient airflow through the nose oil cooler?
 
Seems to me that considering the placement of the nose NACA duct (I ditched the factory scoop in favor of a NACA duct) will be getting quite a bit of RAM air that should generate enough airflow without the outlet generating a vacuum.
 
-Don Johnston
XL-RG_______________________________________________
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