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Long Ez

 

Time to replace the old vortex generators on the GU canard of my Long Ez; need 120 clear ones.

I built the airplane, have almost 2000 hours on it, powered by an O-320 Lycoming. The VGs are used primarily to reduce or eliminate the pitch change associated with moisture.  I've tried various types and locations, and have it pretty much figured out. I took off the old VGs to repaint, but damaged some of them, so I thought I would try yours instead.
I'm a former US Navy A6 pilot, and graduate of the US Navy Test Pilot School, with about 6000 flight hours.
Took a couple of hours to install the VGs; from prior expience with the GU canard on the Long Ez, I put the vgs just aft of the 50 percent chord, once inch apart, angling in at 15 degrees.
I had a significant pitch down in rain that has been eliminated (same results with the old VGs).  Went for a spin in the rain and it flies fine.
Straight forward installation;
I especially like the adhesive sheet. Much less messy that using liquid adhesives.
This would verify that your VGs address and solve the pitch change problem with the original Long Ez and Varieze GU canard.
Thanks for a nice product.

Ken, Washington, USA

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Hello JG,

I just wanted to comment on your VG's that I installed on my Long-EZ. I installed the kit to stop the aircraft's tenancy to pitch down in rain and cloud. I installed the VG's 60mm apart, aft of the top of the airfoil, about half way between the thickest part of the airfoil and the elevator slot on the canard.

IMG-20110414-00084.jpg
As regards the pitch-down tendency: Job done. No pitching tendency at all. 

There were two side effects noted. First, my canard lift-off speed increased by five mph, but then my airplane is ballasted somewhat forward, and at any rate this is not a problem. A second, very surprising side effect is that my true airspeed at 2000' at 75% power has increased by a full ten knots! This was very unexpected, but has been confirmed by number of flights using the GPS boxing method of determining TAS 
 (http://www.reacomp.com/true_ airspeed/index.html), so that pitot/static inaccuracies are eliminated. To say that I am a satisfied customer would be an incredible understatement. 

The kit was, just as advertised, very easy to install, and looks great on the Long-EZ. Thanks for a great product.

Regards,

Bob

 

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