REFLECTOR: The use of VG to aid cooling

[Jerry Teitsma via Reflector]

I used large (1" high) VG ahead of the naca scoops on the roof of my Velo to reduce oil temps and they are definitely lower - by about 20 degrees.  I think the easy way to see the affect of the VG is looking at cylinder head temps.  Mine came down noticeably.  Jerry  

----- Original Message -----

From: "Reflector" <reflector at tvbf.org> 
To: "Reflector" <reflector at tvbf.org> 
Sent: Tuesday, September 30, 2014 10:56:14 AM 
Subject: Re: REFLECTOR: The use of VG to aid cooling 

Great Job ! . But now I ask the question how is it so many builders 
claim the small vg's help when your info so clearly says it does not. I 
have small vg's  in front of my nacas 
and was sure they helped till now. :(   I have now put testing my naca 
intake back on the testing list. Oh well more fun things to experiment 
with :-) . 

Great article so loaded with great info. 


Ron 



On 9/30/2014 8:48 AM, Matt Bucko via Reflector wrote: 
> Well done David. 
> Matt 
> 
> 
> On 9/29/2014 5:09 PM, David Ullman via Reflector wrote: 
>> My Velocity has always run hot.  I have fixed this with the use of 
>> Vortex Generators aiding the flow of air into the NACA ducts on top 
>> of the fuselage.  For a full report go to: 
>> 
>> https://davidullman.com/uploads/THE_USE_OF_VORTEX_GENERATORS_TO_ENHANCE_PUSHER_AIRCRAFT_COOLING.pdf 
>> 
>> 
>> Comments appreciated. 
>> 
>> To see recent photos of N444DX hangared in Independence Oregon, go to: 
>> 
>> https://davidullman.com/VelocityPhotos.php 
>> 
>> David Ullman 
>> David at davidullman.com 
>> 
>> 
>> 
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