[ACEL]

5th Position, 2nd geometry, VGs type mix
As experienced and reported by Julian Edgar in his book on a 2007 Honda Legend, vortex generators are positioned on the rear window glass. In my case, along the top edge. I am not tall enough to have my rear sight hindered. The “airplane” type VGs are installed on each sides to replace the missing shark type ones to make a complete row from left to right.

Ah! Finally! The window center, bottom and side edges tufts all stabilize. No picture needed! I proceed to a “clean” definitive install. Some “Dollar Store” two sides transparent acrylic gel tape was used to secure the “airplane” type VGs to the glass. The commercial shark fin type VGs have their own two side tape. The “airplane” type VGs will be replaced when the shark fin ones ordered come in in August. The acrylic gel tape glue is easily removed when soaked with WD-40, like may other glues.

Aerodynamics result

The recirculation flow bubble on the car rear window causes drag. So, using the “throttle stop” method (Julian Edgar, 2019, Youtube) against the last modification results data to date, the maximum speed allowed at a given throttle opening is increased by 2 %. The fuel economy measured at 2,5 %.

In the end, adding up small economies make up some big economy!