My winter project will be a 1/5 scale Wilga which I will use as an aero-tow tug, powered by a G-62. The kit I have was built by Fan Fly in the Slovak Republic, but I am going to do more than simply add an engine and radio before I fly it.

As the full size version of the Wilga is equipped with leading edge slots, I would like to add this enhancement to the model. The wing is of the built-up variety, with a NACA 2415 section. My inclination is to simply add a permanent extension (I am not sure what to call the piece in front of the slot!!) to form a gap about 1/4 inch wide at the top and slightly more than 1/2 inch at the bottom. The extension would be airfoil shaped with the forward-most part in line with the zero camber line of the main part of the airfoil.

Does anyone have any experience with building this sort of thing?

What are the cg considerations, and what can be expected in the way of lift changes?

What are the pitfalls?