REFLECTOR: Top NACA scoop VG location

[Mark Magee]

Aww man. I was counting on that figure as that's just about what I need ;)

Mark B. Magee
Sent from IPhone 4

On Nov 20, 2011, at 8:32 AM, Scott Derrick <scott at tnstaafl.net> wrote:

> 40-50 degree reduction!!  hahahaha That must be in Dog Degrees!
> 
> -------- Original Message --------
> Subject: Re: REFLECTOR: Top NACA scoop VG location
> From: Tony Babb <tonybabb at alejandra.net>
> To: 'Velocity Aircraft Owners and Builders list' <reflector at tvbf.org>, bobj at jaxtechllc.com
> Date: 11/20/2011 01:57 AM
>> There was an article in Velocity Views (volume 29) from the factory about this. I just went online here http://www.velocityxl.com/content.php?1064-Velocity-Views-Articles and all the links on this page appear to be broken – Brett? I have a hard copy and it says place them about one inch in front of the NACA, the front of the fins should be about 1.5 inches apart and the back about 2.25 inches – for an XL. For the standard fuselage move them closer but still maintain that .75 inch difference. The factory claimed a 40 – 50 degree reduction in CHT.
>>  
>> Tony Babb
>> SERG 52% done, 78% to go
>> www.alejandra.net/velocity  
>>  
>> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of Mark Magee
>> Sent: Saturday, November 19, 2011 7:56 PM
>> To: bobj at jaxtechllc.com; Velocity Aircraft Owners and Builders list
>> Subject: Re: REFLECTOR: Top NACA scoop VG location
>>  
>> Bob,
>> Great pics. Thanks for posting as I wasn't clear in my mind where to apply my VG's.
>> 
>> Mark B. Magee
>> Sent from IPhone 4
>> 
>> On Nov 19, 2011, at 8:22 PM, "Bob Jackson \(Jax Tech\)" <bobj at jaxtechllc.com> wrote:
>> 
>>  
>>  
>> Kevin,
>>  
>> I don't remember getting much guidance on placing our VGs for the inlet scoops, but they do seem to lower our CHTs up to 10 degrees.  Hopefully, you can get a good idea from proportioning things from the photos -- I don't have any exact measurements.  We used two rows because we definitely see higher CHTs in the climb with lower climb airspeeds, so I'm assuming the air on the top of the fuselage is separating earlier than where we put our original set of VGs.  I would say our farthest set is about at the 18" mark that Scott mentioned.
>>  
>> <image001.jpg>
>>  
>> <image002.jpg>
>>  
>> <image003.jpg>
>>  
>> Bob Jackson
>> Turbo IO-500N
>> N2XF
>>  
>> -----Original Message-----
>> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]               On Behalf Of Scott Derrick
>> Sent: Saturday, November 19, 2011 10:04 AM
>> To: Velocity Aircraft Owners and Builders list
>> Subject: Re: REFLECTOR: Top NACA scoop VG location
>>  
>> I have been told that ideally its about 12 to 18 inches.  Mine are about 6 inches which did improve the cooling but I didn't, see the numbers that others have reported.
>>  
>> Now that its winter when running lop i'm running a bit too cold!
>>  
>> Kevin Baker <flykb at verizon.net> wrote:
>>  
>> >Hi All
>> >What is the exact location and angle of the Vg for the naca scoops.
>> > 
>> >Example 3" in front of the front of the the naca scoope 1" left and right from midline of the scoope at an angle of 20deg rt and 20deg left from midline of the scoop
>> > 
>> >Thanks
>> >Kevin
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> 
> -- 
> Spirit is the real and eternal; matter is the unreal and the temporal.
> Mary Baker Eddy
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