REFLECTOR: VGs for engine cooling NACA scoops

Tony Babb tonybabb at alejandra.net
Mon Mar 9 16:29:23 CDT 2009


For those who have it, the Velocity Views article was in VV 1st quarter 2002
- Volume 29, page 7. For those without here's a summary of the article:

If you already have armpit scoops consider adding VGs, The factory XLRG had
a 40 degree reduction in CHT adding just VGs, about 4 inches in front of the
armpit scoop entrance, the leading edge of the VGs are 1.5 inches apart, the
trailing edge 2.25 inches apart - they didn't say how high the VGs were. For
those with NACA scoops, they placed VGs about 1 inch in front of the NACA
inlet, same angle as for the armpit scoop and reported 40 - 50 degree CHT
reduction. They then tried putting VGs in the throat of the NACA inlet,
about 2 inches from the front of the throat, reported 20 degree reduction in
CHT. With a standard fuselage move the VGs closer together but leave the
same difference in width - .75 inches to provide the correct angle.

Tony

 

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Dave Philipsen
Sent: Monday, March 09, 2009 8:20 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: VGs for engine cooling NACA scoops


nmflyer1 at aol.com wrote:
> I could use the NACA VG placement pattern as well.
>  
> Kurt
>
Ditto for me.  I'm thinking about adding the NACA scoops this year and 
getting rid of the armpit scoops.


Dave Philipsen
Velocity STD FG
N83DP
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