VG location--from a VG manufacturer

[Ted Waltman]

See the vendor comments below regarding the discussion on the builder's list
regarding VG location. Al Paxhia and I both have their VG's on our Moose.



Link to their website: http://www.pnwaero.com/



Ted Waltman



From: PNWAero [mailto:aero@pnwaero.com]
Sent: Friday, October 09, 2009 9:34 AM
To: Ted Waltman
Subject: RE: VG location--existing customer



Hi Ted:



In regards to your question: I generally start at 10% of the chord and have
never placed them further back than 11% because of loss of effectiveness. I
very rarely go past 9% because of the potential for loss of top speed of the
aircraft. All measurements are to the leading edge of the VG not to the
center of the VG. The chord is measured with the flaps up.



This information is based on our blade style VGs that we manufacture which
includes the same shape that the certified aircraft use. It's our experience
over the years that the delta shape (or shark fin) type of VG is less
effective and may require a different location.



Hope things are going well for you.



Best regards,

Jerry
Pacific Northwest Aero LLC

-----Original Message-----
From: Ted Waltman [mailto:tedwaltman@gmail.com]
Sent: Thursday, October 08, 2009 7:55 AM
To: aero@pnwaero.com
Subject: VG location--existing customer

Hello folks!



I've had your VG's on my Moose for several years. Great product, as my
testimonial on your website indicates.



There's a debate going on within the Moose builders email list regarding VG
location. One figure being discussed indicates that the center of the VG
should be at the 10% chord location.



I have two questions:



- Do you have any general recommendation based on customer or your
own experience regarding % chord location for VG's?



- Is % chord established by measuring from the front of the wing to
the trailing edge of the flaps-with the flaps up or down (I assume down)?





Thank you,



Ted Waltman

Murphy Moose





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