REFLECTOR: Another VG question

[Rene Dugas]

Greg,
Down under would one place the vortex generators on the bottom of the   
airfoil?

Rene' Dugas
Sent from my iPhone 3G

On Apr 2, 2009, at 5:53 PM, "Greg Poole" <greg at pooledresources.com.au>  
wrote:

> Wow - yet another variable - VG height. Sounds like photos of tuft  
> testing
> need to be taken for different spacings/numbers of VG's. When one  
> takes in
> the variables of air flow patterns related to speed, angle of  
> attack, and
> number, placement, height of VG's - there is a serious number (almost
> infinite) of combinations possible.
>
> Photos would at least indicate trends for ultimate VG refinement and  
> save
> everybody duplicating effort in VG refinement. Be good if those with  
> VG's
> put some wool on and share photos (with detail of their VG placement).
>
> Greg in Sydney
>
>
> -----Original Message-----
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]  
> On
> Behalf Of Tom
> Sent: Friday, 3 April 2009 06:23
> To: reflector at tvbf.org
> Subject: Re: REFLECTOR: Another VG question
>
> Thx Al, I have noticed that some folks with EZs have cut down the tops
> of the VGs on the canard. They say this is to get back some lost  
> cruise
> speed without adversely impacting stall characteristics.  Tom
>
> Tom;
>
> I think the spacing has to do with the distance to the airfoil.  On  
> the
> canard the space is much shorter, so you need the vortices closer  
> together
> to get reasonable coverage.
>
> Are the VGs for the canard the same height as those used on the  
> wing?  Could
> be shorter on the canard because of very little BL buildup.
>
> Al
>
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