Contents
What is the purpose of dorsal fin aircraft?
The dorsal fin is needed to add directional stability to the aircraft at high angle of sideslip. A dorsal fin is essentially a triangular flat plate installed at the root of the vertical stabilizer, with a thin section useful to release vortices at high angles of incidence.
What is the purpose of the ventral fin?
The ventral fin is apparently added when the fuselage shields so much of the vertical stabilizer at higher angles of attack that a fin is appended to the belly. This is often used to prevent yaw, especially in twin-engine aircraft where only one engine is operating.
What is the purpose of offsetting the fin of an Aeroplane?
The fin area adds to the area of the fuselage behind the cg to counteract the side area of the fuselage in front of the cg which would otherwise deflect the nose more. It has to be as far behind the cg to give the required restoring moment with the smallest fin. Reducing fin size reduces friction drag, weight and cost.
What is the definition of the dorsal fin?
: a flat thin part on the back of some fish (such as sharks)
What are the different types of fins?
For each fish, generally, there are five main fins follows: Dorsal, Pelvic, Caudal (tail), Anal and Pectoral as shown in Fig. 1. Dorsal fins are located either on the back of the fish or its top, it helps the fish during sharp turning or stops.
Why was the dorsal fin added to the 737?
Adding a dorsal fin, increases surface area. The plus theoretical side is that it increases directional stability. The minus theoretical side is that it adds weight, drag, and manufacturing complexity. Early 737s did not have a dorsal fin. Presumably, at some point Boeing decided that adding one would provide better performance.
Is the 737 equipped with a vertical stabilizer?
I’ve noticed that the 737 has a rather unusual vertical stabilizer, with an extension at the front. Is the 737 the only plane equipped with such a vertical stabilizer, and what is its purpose? The “extension” at the front is called “dorsal fin”.
Why does an aircraft have a vertical tail?
The vertical tail stabilizes the aircraft in the yaw axis. The fuselage is unstable, so a stabilizing fin must be added. Since the vertical has a much higher aspect ratio than the fuselage, it will stall first.
Is there a dorsal fin on the ATR 72?
The ATR 72 doesn’t have a “pronounced” dorsal fin, but you can still see clearly how the sweepback of the vertical stabilizer changes along its length (Wikimedia Commons): Or, on the other side of the speed spectrum (Wikimedia Commons):