Questions 1
A vertical stabilizer provides lateral stability to minimize yaw. The vertical stabilizer is sometimes referred to as the fin. There is a part of the airplane that extends along the top of the fuselage and connects to the vertical stabilizer. In some airplanes, like the Pilatus below
this part looks like it could have a substantial impact on yaw forces. In other cases, like the Cessna 150
it looks like it is mostly for decoration. It looks like it could be extension of the fin that reduces drag, almost like a fairing. My question is, “Does it have a name?”