If you don't know it, it's worth taking some time to read through the personal site of Dieter Schultz, the designer and developer of the Sunny Boxwing series of microlights. It's not only interesting in terms of odd aircraft configurations (always a favorite of mine) but also simplified construction.
Schultz got a patent on his aircraft design not just for the aerodynamics but for the system of wing construction using primarily one size of tube and standard wrap-around gusset with bolts and compression tubes. The planes even broke down to fit in a little 4.0 m x 2.0 m trailer for towing and storage.
There is also a discussion of adverse yaw, and how in the Sunny designs it was counteracted through a degree of flexibility in the wing structure that allowed elevon deflections on lower/rear wing to change the incidence of the upper/front wing as well. Schultz disavows the changes made to the design after he sold the business, including eliminating that flexibility.
Neat stuff. Here's a clip if you are not familiar with the Sunny.
Schultz got a patent on his aircraft design not just for the aerodynamics but for the system of wing construction using primarily one size of tube and standard wrap-around gusset with bolts and compression tubes. The planes even broke down to fit in a little 4.0 m x 2.0 m trailer for towing and storage.
There is also a discussion of adverse yaw, and how in the Sunny designs it was counteracted through a degree of flexibility in the wing structure that allowed elevon deflections on lower/rear wing to change the incidence of the upper/front wing as well. Schultz disavows the changes made to the design after he sold the business, including eliminating that flexibility.
Neat stuff. Here's a clip if you are not familiar with the Sunny.
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