REFLECTOR: Putting additional outlets on the Down Draft Runners

[Scott Baker]

Hello Scott -
Scott Swing is helping a Velocity builder install a TSIO-550 in a Velocity 
XL (details and updates appear from time to time on the Velocity web site) - 
this engine features twin inter-coolers.  They are planning to cool the 
entire engine (inter-coolers and cylinders) using air from the roof-top 
NACAs.  The factory does not have any scientific values relating to how much 
air and pressure is introduced through the NACAs.  Based on field 
experience, we see that it is "just enough" for Lycomings and "plenty" for 
Continentals.  VG's are often added to encourage the air to enter the 
NACA's.  The turbo charged installation is new to us - we do not know if the 
NACAs will provide adequate cooling at altitude.
Scott B.


----- Original Message ----- 
From: "Scott Derrick" <scott at tnstaafl.net>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Friday, April 22, 2005 10:00 PM
Subject: REFLECTOR: Putting additional outlets on the Down Draft Runners


> Many have posted about taking additional air from the downdraft runners to 
> supply oil coolers, water coolers,  intake air, etc...
>
> I will need air for an intercooler and intake air.  I was thinking of 
> using the ram air port I already have and possibly one of the arm pit 
> scoops.  But if there is plenty coming through the down draft NACA's I'd 
> love to eliminate the arm pits...
>
> How much can we steal from the runners before we start effecting the 
> CHT's?
>
> Does the factory have a recommendation on this?
>
> Scott
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