FAQ: What Is A Chord Line In Aviation?

What is the chord of a propeller?

In aeronautics, a chord is the imaginary straight line joining the leading edge and trailing edge of an aerofoil. The chord of a wing, stabilizer and propeller is determined by measuring the distance between leading and trailing edges in the direction of the airflow.

How do you find the mean chord?

Mean Aerodynamic Chord

  1. Identify the center of gravity location, in inches from the datum.
  2. Identify the leading edge of the MAC (LEMAC), in inches from the datum.
  3. Subtract LEMAC from the CG location.
  4. Divide the difference by the length of the MAC.
  5. Convert the result in decimals to a percentage by multiplying by 100.

What is lemac and Temac?

TEMAC – LEMAC = Wing width. LEMAC and TEMAC are easy to calculate for straight wing aircraft. It is simply the measurement from where the wing starts and ends from the datum. For swept-wing aircraft it isn’t that simple.

What is a chord line?

More generally, a chord is a line segment joining two points on any curve, for instance, an ellipse. A chord that passes through a circle’s center point is the circle’s diameter. The word chord is from the Latin chorda meaning bowstring.

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What is chord width?

The distance between the leading and trailing edge of the wing, measured parallel to the normal airflow over the wing, is known as the chord. The width of the wing is greatest where it meets the fuselage at the wing root and progressively decreases toward the tip.

What is lemac in aviation?

The leading edge of mean aerodynamic chord often used as a reference point for various aerodynamic measurements in aircraft design and operation.

What is angle of attack in aircraft?

The angle of attack ( AOA ) is the angle at which the chord of an aircraft’s wing meets the relative wind. The chord is a straight line from the leading edge to the trailing edge.

What is blade chord?

A straight line joining the leading edge of a propeller blade with its trailing edge.

How is Mac aircraft calculated?

To find the center of gravity, we divide the total moment by the total mass: 193,193 / 2,055 = 94.01 inches behind the datum plane. In larger aircraft, weight and balance is often expressed as a percentage of mean aerodynamic chord, or MAC. For example, assume the leading edge of the MAC is 62 inches aft of the datum.

What is Mactow?

MAC stands for Mean Aerodynamic Chord, TOW stands, obviously, for TakeOff Weight. To clearify: when the MAC of a wing is 5 meters, and the MACTOW on the loadsheet indicated 20%, this means that the location of the centre of gravity for the takeoff weight is at 20% of 5 meters from the beginning of the MAC on the wing.

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What does lemac stand for?


Acronym Definition
LEMAC Leading Edge of the Mean Aerodynamic Chord

What is the average chord length?

The average cord length from the Dirac formula was 4a/3 for a sphere of radius a. The average chord length calculated for a sphere assuming an isotropic flux distribution was equal to radius.

Why do you think chord length impacts the range?

If you increase the chord, lift goes up almost linearly and stability decreases, because now the wing’s lift force has a longer lever arm in flow direction.

What is tip chord?

The chord at the tip of an airfoil, measured parallel to the plane of symmetry, and at points where straight leading or trailing edges meet the curvature at the tip. In variable-sweep wings, the tip chord is measured when the sweep is minimum.

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