REFLECTOR: VGs for engine cooling NACA scoops

[Scott Derrick]

Doug,

send me the .pdf and I'll post it on my http server so all can get it.

Scott

Douglas Holub wrote:
> Thanks to everyone for all the input. Ken Baker sent me a .pdf of a
> template. It shows 1.375" and 2.00" for my Standard fuselage. The
> angle measures about 19 degrees on each side of the airflow (for a
> total included angle of  38 degrees between the VGs.)
>
> There's a great seminar from Oshkosh '07 about cooling Rutan type
> aircraft at http://www.ez.org/downloads.htm. If you listen to the .mp3
> file while you watch the PowerPoint slides, it's almost like being there.
>
> Doug Holub
> N2980W, Standard FG
>
> ----- Original Message ----- From: "Tony Babb" <tonybabb at alejandra.net>
> To: "'Velocity Aircraft Owners and Builders list'" <reflector at tvbf.org>
> Sent: Monday, March 09, 2009 4:29 PM
> Subject: Re: REFLECTOR: VGs for engine cooling NACA scoops
>
>
>> 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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