REFLECTOR: Another VG question

[Greg Poole]

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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