Lesson Quicktakes cover the items that should be memorized from each of the wifiCFI Lessons. They do not cover all of the lesson details in-depth.
ARM = The horizontal distance from the reference datum to the CG of an item.
BALLAST = Weight carried in the aircraft to shift the CG within allowable limits.
CENTER OF GRAVITY (CG) = The point at which an airplane would balance if suspended.
CENTER OF LIFT = The point at which the lift is concentrated on the wing.
CG LIMITS = The extreme locations where the CG must land within.
DATUM = An imaginary vertical plane from which all measurements of Arms are taken.
MOMENT = The product of the weight of an item multiplied by its Arm.
STATION = A location along the airplane fuselage usually given in terms of distance.
DATUM, ARM, AND STATION:
CENTER OF GRAVITY ENVELOPE:
EFFECTS OF BEING OVERWEIGHT:
Longer Takeoff Run
Reduced Rate and Angle of Climb
Service Ceiling Lowered
Cruise Speed Reduced
Cruise Range is Shortened
Maneuverability is Decreased
Longer Landing Roll
Excessive Loads on Landing Gear
CG BALANCE CONTROL:
WEIGHT SHIFT FORMULA:
WEIGHT AND BALANCE FORMULA:
Weight x Arm = Moment