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Please read the readme.txt included in the ZIP
For the look, the leading edge of the wing has a slight reverse sag. The look of the model, with the shark fin shaped rudder, is as aggressive as it gets.
It is not expensive to build since it takes very little wood.
For the Fiu, everything has been designed to fit on a single 2mm balsa board! Of course, you have to add a few rods for the spars and leading edge, among others.
Design by Laurent Berlivet
Drawing available on Jivaro-Models
Some content in menu 2.