Longitudinal Stability and Center of Gravity ➶

It’s KitHack Model Club’s fault that today I learned the following:

In order to achieve a good longitudinal stability, the center of gravity (CG) should be ahead of the Neutral Point (NP), which is the Aerodynamic Center of the whole aircraft.

NP is the position through which all the net lift increments act for a change in angle of attack. The major contributors are the main wing, stabilizer surfaces and fuselage.

The bigger the stabilizer area in relationship to the wing area and the longer the tail moment arm relative to the wing chord, the farther aft the NP will be and the farther aft the CG may be, provided it’s kept ahead of the NP for stability.

✶ Saturday, 4 May 2024

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