Left Wing: Install Vortex Generators

I completed my last assembly task on the left wing before I move it back on the stand and duplicate efforts on the right wing.  Vortex generators were installed to reduce the stall speed of the airplane which will reduce landing approach speed and likewise reduce landing distance.   I've been told the S7 is better capable to produce 3-point landings with VGs, as well.  The VGs were positioned such that they have the best ‘bite’ at the airflow when the wing is at the stall angle of attack; not too far forward or aft. The manufacturer recommended that the leading edge of the VG be aligned at the 7% wing chord position.   This results in the VG functionally positioned at the 9% position.  The average wing chord for the S7 is 60 inches, so I used 4.2 inches as my setback position from the LE spar. 

Here is a Stolspeed VG

Here are the VGs placed on the precut advesive pads.

It was helpful having the wings off when doing this because then the wing root was exposed.  It was a simple matter of running a string line from LE to TE spar to determine the chord line and then using a triangle square transferring the 4.2" measurement to the top of the wing.  This location mark on the wing was then carried down to the outboard end of the LE spar and a string line run through the two marks.  This line was then projected across the tip wrap area and terminated shy of the wing tip fairing.

Here is the template used to get the correct angle on successive VGs.  The 60 mm template was used for the first 3' on the outboard wing and then spacing was increased to 90 mm up to the wing root.  The manufacturer recommended this placement so that the outboard wing would not stall first and, presumably, not result in loss of aileron control.