REFLECTOR: Vortex generators location for armpit cooling scoops

Thu Aug 15 17:52:59 CDT 2013

OK, So I am trying to understand what is happening here aerodynamically? Sorry, but I am new to all this. It looks like you are trying to disturb the airflow over the fuselage to somehow help air to the cooler? Is this correct and did you see any benefit from it? If it is working, could you maybe take a pic with a measuring tape depicting the distances from the openings. Would be greatly appreciated.

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>________________________________
> From: Laurence Coen <lwcoen at hotmail.com>
>To: Andrew Ellzey <ajlz72756 at yahoo.com>; Velocity Aircraft Owners and Builders list <reflector at tvbf.org> 
>Sent: Thursday, August 15, 2013 10:18 AM
>Subject: Re: REFLECTOR: Vortex generators location for armpit cooling scoops
> 
>
>
>Andy,
> 
>There are no vortex generators in front of my armpit scoops (see 
previous).  They are in front of my oil cooler inlet on the nose and I 
attached a photo to give an idea of what they look like.  They are made of 
angle aluminum and attached with silicone rubber cement.  Something 1 1/4" 
tall should do it.  The ones in the picture are 1" tall by 1" wide.
> 
>Larry Coen
>N136LC
>
>
>From: Andrew Ellzey 
>Sent: Wednesday, August 14, 2013 10:19 PM
>To: Velocity Aircraft Owners and Builders list 
>Subject: Re: REFLECTOR: Vortex generators location for armpit 
cooling scoops
>
>
>Larry,
> 
>So that is the question, how tall are your vortex generators, how far 
out in front of the armpit scoops did you place them? Did you make them, or buy 
them and if you bought them, where from. Can you please send a photo. 
> 
>Thanks,
> 
>Andy
>
>
>From: Laurence Coen  <lwcoen at hotmail.com>
>>To: Velocity Aircraft Owners and Builders  list <reflector at tvbf.org> 
>>Sent: Wednesday, August 14, 2013 6:25  PM
>>Subject: Re: REFLECTOR:  Vortex generators location for armpit cooling scoops
>>
>>
>>
>>Andrew,
>> 
>>I have armpit scoops on my SR/RG that look just like yours.  When I  mounted them I was concerned about the boundary layer and extended the scoops  3/4" out from the fuselage so the entire scoop is outside the boundary  layer.  I also added an insert that looks like venturi that in theory  should help with pressure recovery.  The fact that I don't have cylinder  head cooling problems doesn't mean that it will work for you.  I am down  draft cooling a 220 HP Franklin.  I have vortex generators ahead of my  oil cooler inlet and that did lower my oil temp.  If you try vortex  generators I would suggest that they be tall enough so they stick out of  the boundary layer.
>> 
>>Larry Coen
>>N136LC
>>
>>
>>From: Andrew Ellzey 
>>Sent: Wednesday, August 14, 2013 3:50 PM
>>To: Velocity Aircraft Owners and Builders  list 
>>Subject: REFLECTOR: Vortex generators location for armpit cooling  scoops
>>
>>
>>I am still battling a high CHT at cruse on my # 5 cylinder on my updraft  IO-540-E1A5, 300HP Lycoming engine. I can do full power climb outs in the  pattern all day without any issue. From everything that I have read on this  subject on the Reflector, this is common with the arm pit cooling.  The  higher pitch angle in the pattern, and in a cruse climb, forces plenty of  cooling air into the scoops, but the cooling ability drops off in level cruse  fight attitudes. My question is, is there anyone left on the reflector that is  using the armpit cooling, and do you have vortex generators in front of your  armpit scoops to help the airflow boundary layer adhesion to this area forward  of the armpit scoops? If you have vortex generators, what size, location, did  you make them, buy them, can you send a photo, please.
>> 
>>I have swapped and calibrated my CHT probes, swapped the lowest CHT  cylinder fuel injector with my #5 injector. Nothing helps, it seems to be tied  with airflow into my scoops, or airflow inside my lower cowling. If the  addition of vortex generators doesn’t  help, I will probably have to  install some additional baffling to redirect more air to the aft two  cylinders, #5, and #6. Cylinders 1, 2, 3, and 4 are getting plenty of air, in  fact they are running cooler than I like at this time, but until I can get #5  CHT under control, I can’t lean my engine properly to know if I have adequate  airflow for all cylinders or not. Installing my gear doors seemed to  help.
>> 
>>Photo attached showing my armpit cooling scoops. The additional screws  under the armpit scoops, attaches a mating internal scoop that directs the  airflow to my aft lower cowling.  
>> 
>>Thanks again for your help,
>>-----------------------------------------
>>Andrew 
  Ellzey
>>N151AJ 10 hours into Phase 1 testing
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