REFLECTOR: NACA scoops

[Keith Hallsten]

Phil,

Perhaps you agree with me, but you're saying something different.  I don't
think it's worth getting the pre-molded scoops unless the fuselage has the
pre-molded recesses for them to drop into.  It's about the same amount of
work as making your own scoops.  However, I do think it's a good idea to
have the expansion ducts, so you can make the back of the scoop transition
to the duct.

Keith


-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Phil Hooper
Sent: Tuesday, October 18, 2005 10:30 PM
To: 'Velocity Aircraft Owners and Builders list'
Subject: RE: REFLECTOR: NACA scoops

Noel,

I agree with Keith.  Get the pre-molded scoops from Sebastian.  I have the
XL-RG and assume the scoops are the same.  The pre-molded parts make it
easier and more accurate, still a lot of work, but you’ll get the right
dimensions all around.  I would have to measure, but I think the final
openings are 11” X 2” tall.  Be sure and allow ¼” to 3/16” along the top of
the firewall to provide some strength for the cowling attach points.  

Also, we discovered a potential problem.  My fuselage ( built in 2001) had
the pre-molded markings-indentation, viz., where to cut the scoops.  The
co-pilot side went fine, the air saw blade going through the skin flush
against the firewall.  But when we cut the pilot side on the back, we went
into the firewall.  At first I was alarmed, thinking the firewall was not
aligned.  But the factory assured me that wasn’t possible because of
notches;  the way it all comes together.  

After a lot of examination, we concluded that the indentations on the
factory mold are were in fact about ¼” further aft than the co-pilot side.
The factory basically conceded this point meaning that fuselages birthed in
this mold set will be the same.  I did some repair to rebuild the cut part
at the top of the firewall still connected to the skin, and moved the rest
of the cutout forward, mostly for looks.  I don’t think it’s critical.
Lot’s of pix if anyone is interested.  

Did anyone else have this fun experience?

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of gattenby at gbronline.com
Sent: Tuesday, October 18, 2005 8:02 PM
To: reflector at tvbf.org
Subject: REFLECTOR: NACA scoops


On an downdraft standard fusalage, how deep are the NACA's?
I've got cut lines drawn on the top, but I can't find
instructions 
on how deep do I make them drop down.
My kit it old enough that I didn't get the premolded
inserts.

Noel
3SUV103
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