REFLECTOR: Cowl Vortex generators

[Tom]

I've got VGs attached to fuselage in front of the cowling air intakes 
(updraft cooling). They do help.
Also, I called Velocity this morning, the full VG kit is $220 and the 
template is available for purchase by itself for $165.                
                                                    You can get 120 of 
the clear Stolspeed VGs with removable adhesive delivered for $97. 
Fairly inexpensive for the suggested benefits. Tom

Vortex generation got me to thinking about keeping air flow attached  
for a longer arc near the prop between the exit holes in the cowl and  
the prop. If the airflow stayed attached longer it might supply less  
disrupted air to the prop. This may be too close to the prop root to  
make difference. It might increase the drag by forming more vacuum but  
that might improve cowl evacuation.  VG's leading the NACAs helps. Two  
pairs on each top and two on the lower cowl 6 or 8 inches forward of  
the groove-might have a benefit. I've thought whether our exits should  
be rectangular to decrease air flow disruption.  Food for rumination.  
Also would VG's 6" forward of the ailerons make them more effective at  
slow speeds similar but for different reasons to fences.

Rene' Dugas
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