REFLECTOR: NACA scoop

John Dibble aminetech at bluefrog.com
Tue Sep 12 12:40:35 CDT 2006


There was a detailed article on how to make NACAs in one of the EAA magazines a few
months ago.  I'm not home now and can't look it up.

John

Andy Millin wrote:

> I agree Brian.  NACA's are easy to make.
>
> Vlad's spreadsheet is good, but it doesn't calculate the lip.
>
> http://www.tvbf.org/docs/NACA%20Submerged%20Inlets.xls
>
> Andy
>
> -----Original Message-----
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
> Behalf Of michalk
> Sent: Tuesday, September 12, 2006 9:30 AM
> To: amillin at sbcglobal.net; Velocity Aircraft Owners and Builders list
> Subject: Re: REFLECTOR: NACA scoop
>
> NACA's are easy.  I made my own from Vlad's Excel calculator.
> Download it here: http://www.tvbf.org/docs/nacascoop1.1.xls
> Other good NACA stuff there as well
> http://www.tvbf.org/docs/
>
> Andy Millin wrote:
> > Hey Dave,
> >
> > The simple answer to making my own is ... because I could. :)
> >
> > I image the factory scoop would work just fine.  The factory scoop is
> > naca-esque.  I wanted a true NACA, and I could.
> >
> > NACA inlets work best when placed in areas with a thin boundary layer.
> > For our purposes, anywhere in the nose area should work pretty well.
> > At this point your placement decision will be more aesthetics.  I'll
> > bet that if the nose of the inlet is within a couple feet of the nose,
> > you'll get plenty of fresh air.  With this placement I doubt you will need
> VG's.
> >
> > I used a simple saber saw to make my fuselage cuts.  Always cutting 1/8"
> > inside the lines and filing the hole to the correct size.  File and
> > fit (repeat ... and then repeat some more)  (big grin)
> >
> > Fly you plane up to Michigan, give me a ride, and I'll install it for you!
> > ;)
> >
> > Best regards,
> >
> > Andy
> >
> >
> >
> >
> > -----Original Message-----
> > From: Dave Philipsen [mailto:velocity at davebiz.com]
> > Sent: Monday, September 11, 2006 8:37 PM
> > To: amillin at sbcglobal.net; Velocity Aircraft Owners and Builders list
> > Subject: Re: REFLECTOR: NACA scoop
> >
> > Hi Andy,
> >
> > Why did you decide to make your own instead of the factory one?
> > Currently, the oil cooler
> > inlet on the belly is a NACA scoop.  So, I suppose it would be better
> > for me to locate one for cabin cooling on the side, eh?  Since I'm an
> > owner and not a builder, I'm looking for ideas...how to orient the
> > scoop to work best, how large to make the scoop, what kind of saw to
> > cut the scoop with, whether VGs ahead of the scoop would be beneficial,
> etc.
> >
> > Andy Millin wrote:
> >
> >>I made my own NACA.  I still have the factory provided inlet molded part.
> >>If you want it, it's yours.
> >>
> >>Andy
> >>
> >>-----Original Message-----
> >>From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]
> >>On Behalf Of Rene Dugas
> >>Sent: Monday, September 11, 2006 10:28 AM
> >>To: velocity at davebiz.com; 'Velocity Aircraft Owners and Builders list'
> >>Subject: Re: REFLECTOR: NACA scoop
> >>
> >>I recommend smaller than the factory NACA and a large 3" nozzle inside.
> >>The NACA could also be placed on the belly of the nose on a FG.
> >>Rene'
> >>
> >>-----Original Message-----
> >>From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]
> >>On Behalf Of Dave Philipsen
> >>Sent: Sunday, September 10, 2006 9:51 PM
> >>To: Velocity Aircraft Owners and Builders list
> >>Subject: REFLECTOR: NACA scoop
> >>
> >>I've got about 12-15 hours now on my newly acquired STD FG and one
> >>problem I'm noticing is that I don't have very good ventilation in the
> >>cabin.  The guy who built it used a 1-1/2 inch hose collecting air
> >>coming into the oil cooler chamber.  Even on 75-80 degree days it gets
> >
> > pretty stuffy in there.
> >
> >>It seems like I've seen some builders use a NACA scoop on the side
> >>near the front.  Is that normally used for ventilation?  If so, how
> >>big of a scoop would I want to use?  Any suggestions/ideas?
> >>
> >>
> >>--
> >>Dave Philipsen
> >>STDFG
> >>N171SP
> >>
> >>
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> >>
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> >>
> >>
> >>
> >
> >
> > --
> > Dave Philipsen
> > STDFG
> > N171SP
> >
> >
> > _______________________________________________
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> >
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>
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