The Root to fusleage junction is a source of separation in many gliders.

In our Marske Pioneer at extrmely slow speeds we discovered that a
separation seems to start at this wing root/ fuselage junction. And a fillet
may solve this.

Tuft the wing and record the result on film with voice commentary for the
differing speeds. When you have a newly constructed fillet record that too
on film to see if you have improved the airflow.

We will be adding a wingroot fillet on our Pioneer over the winter months.

-mat

Marske Flying Wings
http://www.continuo.com/marske