In aeronautics, the keel effect (also known as the pendulum effect or pendulum stability [1]) is the result of the sideforce-generating surfaces being above or below the center of gravity of the aircraft.

Keel effect is a design feature of aircraft that gives it lateral stability. In other words, the keel effect of an aircraft’s shape will keep it from rolling. Keel effect helps keep the airplane flying straight ahead instead of entering a turn every time it hits a little turbulence.

Typically, the aircraft keel consists of spars, ribs and skin. This scheme is classical, little changed since the appearance of the first aircraft. The front spar is sloped (as a rule). Most often, the keel is single, but in some cases it is made double and even triple (on propeller-driven bombers).

Mar 31, 2016 · What is the Keel Effect and how does it happen? Is it the same as Pendulum Effect or it doesn't exist? The Pilot's Handbook of Aeronautical Knowledege by the FAA has an explanation that says: An aircraft always has the tendency to turn the longitudonal axis of the aircraft into the relative wind.

Dec 13, 2022 · In the realm of aviation, the keel beam is a structure that runs across the belly of the fuselage, connecting the front and rear portions of the aircraft underside.

In aeronautics, the keel effect (also known as the pendulum effect or pendulum stability) is the result of the sideforce-generating surfaces being above or below the center of gravity of the aircraft.

Aug 8, 2009 · On a boat the keel beam forms the main load carrying member or backbone of the ship. On a aircraft the keel beams, there are normally two, extend from the lower surface of the center wing box to fuselage skin.

Depending upon the action of the relative wind on the side area of the airplane fuselage, in a slight slip the fuselage provides a broad area upon which the relative wind strikes, forcing the fuselage to become parallel to the wind. This is known as a keel effect. This effect aids in the lateral stability of the aircraft.

The Keel Beam is a fundamental structural element in an aircraft's fuselage, providing essential support, rigidity, and load-bearing capabilities. Its robust construction, precise engineering, and strategic integration contribute to the overall safety and performance of the aircraft.

The action of the airflow over a body is a large part of the study of aerodynamics. Some common aircraft terms, such as rudder, hull, water line, and keel beam, were borrowed from nautical terms. Many textbooks have been written about the aerodynamics of aircraft flight.