Here's a sample of the actual wording.
""United States Patent #5,398,893
Model aircraft constructed with extruded fluted plastic sheet
""7. A method of forming an aircraft control mechanism comprising the steps of: forming an aircraft lift surface having first and second spaced flexible walls and a leading edge and a trailing edge; interposing a plurality of spaced longitudinal web structures between said spaced flexible walls to provide rigidity to the aircraft lift surface; and severing one of said walls between two of the spaced longitudinal web structures such that a lift surface and a control surface are formed with the nonsevered one of said walls forming a flexible hinge therebetween to allow arcuate movement of said control surface with respect to said lift surface.
8. A method as in claim 7 further comprising the steps of: forming an aircraft wing with said lift surface;
and forming an aircraft aileron with said control surface when said one of said walls is severed.
9. A method as in claim 7 further comprising the steps of: forming an aircraft horizontal stabilizer with said lift surface; and forming an aircraft elevator with said control surface when said one of said walls is severed. ""
""1. Field of the Invention
This invention relates in general to aircraft and in particular to model aircraft components constructed with twin wall fluted plastic sheet material. ""
I didn't see anything on the patent page about fuse construction, but everything else was covered very carefully.