What are the names of the two special truss designs mentioned?

The two special truss designs highlighted are the scissor truss and the kingpost truss.

The scissor truss is characterized by its unique design which creates a ceiling that can have a higher pitch for certain architectural aesthetics, and it also allows for greater open space beneath. This truss has members that cross each other, forming a shape resembling scissors, which provides both structural integrity and design versatility.

The kingpost truss, on the other hand, has a straightforward design that consists of a horizontal beam (the top chord) supported by a vertical central post (the kingpost) and two angled supports (the bottom chords). This design is effective for short spans and offers simplicity in construction while still providing stability and good load-bearing capabilities.

Understanding these truss types is crucial in carpentry as they determine the structural performance and suitability for various building applications.