This inquiry regarding vortex generators was forwarded to me by the president of my local EAA chapter 1345. Just a brief history of my background regarding vgs:  I've been involved with vortex generators for general aviation aircraft from the very beginning - over 16 years. I knew the benefits of vgs, and our company, Pacific Northwest Aero LLC, which manufactures aircraft parts also provides vg kits for experimental/homebuilt aircraft. Regarding Lancairs - we presently have a kit for the 320/360 which reduces the stall speed at least 6 knots. All the owners' comments state that the low speed handling characteristics are greatly improved. This particular kit uses vgs on the wings only. We do have kits for other models of aircraft that use the vgs on the vertical as well as the horizontal, for example, the Murphy Moose and the One Design. By properly placing the vgs on the wings you can get significant lower stall speeds without penalizing the cruise speed.

I have no problem at all with "performance" enhancers - as long as data is provided when flown by an independent test pilot -

I would like to see pressure altitudes, temperatures, aircraft weight and balance and indicated, calibrated and true airspeeds with and without vgs.  Maybe a CAFE test series.

 

<<<...the low speed handling characteristics are greatly improved.>>> - is a qualitative statement and is fine when used as such.

 

My Lancair 320 low speed handling characteristics were greatly improved after the PIC had about 60 flight hours of experience under his belt.