Questions tagged [cg]

The CG (Center of Gravity) of aircraft is the point at which the aircraft would balance if it were possible to suspend it at that point.

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11
votes
3answers
42k views

What does %MAC mean?

A document said that the optimum CG position is from 13% MAC to 33% MAC. I'd like to know what that means, and what would this look like on an actual plane.
9
votes
4answers
2k views

What are the limits to lateral Centre of Gravity imbalances?

I've never seen lateral CG limits prescribed for aircraft (though I have very imited experience in this realm). Presumably, aircraft are designed to keep the center of balance as close as possible to ...
17
votes
1answer
747 views

Why is the top left corner cut off on the cg location envelope for small airplanes?

Why does the PA-28 C.G. envelope have the top left corner cut off rather than allowing higher weights at a forward C.G. like it does at the aft C.G.? (source)
12
votes
2answers
4k views

Why is the AWACS' rotodome located at the back and over the aircraft?

Browsing this website, I found this question dealing with torque due to the huge piece in motion, and its answers also speak of drag. The rotodome is located above the aircraft and at the aft of the ...
2
votes
3answers
3k views

How Centre of Gravity (CG) is adjusted?

I've gone through the following questions on Stack Exchange and other few questions too: Why is managing CG (centre of gravity) important? How are the limits of the center of gravity chart ...
12
votes
2answers
904 views

Is the differential between the forward and aft CG limits indicative of the overall stability of an airplane?

Studying up on the Cessna 162 Skycatcher POH to take my checkride in soon and I noticed the differential between the maximum and minimum CG's is a mere 2.5 inches from one to another. I got curious ...
1
vote
1answer
624 views

How to calculate the location of C.G. A.C. & N.P. in static longitudinal stability?

We are in the conceptual stage of design and, using Raymer & Nicolai as references, I am doing a rough calculation of "power off" neutral point (N.P.) to find the optimum c.g. and a.c. positions. ...