REFLECTOR:Vortex Generators on XL

[John Dibble]

Do vg's affect cruise speed?

John

Chuck Jensen wrote:

>Jack,
>
>Everything I do is trial and error.....though I did use the patterns
>provided by Velocity.  They are installed on both the canard and wing (and
>both sides, naturally).  I don't remember the exact count but buy a 100
>(they're cheap) and use the extra for replacements.  To paint them, after
>scuffing the bottom on sandpaper, I just stuck them on packing tape and gave
>a few light coats of enamel for UV protection.
>
>Do us a favor.  Before you install, do a few altitude stalls and see if you
>can nail a number.  After installation, repeat and see what difference, if
>any, you note.  Maybe you already have a hard number for touchdown IAS that
>you can reference---that would make a before/after comparison even simpler.
>Most seem to think it reduces touchdown by 5 to 7 kts.
>
>Chuck Jensen
>
>  
>