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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.

How is lemac calculated?

Identify the leading edge of the MAC ( LEMAC ), in inches from the datum. Subtract LEMAC from the CG location. Divide the difference by the length of the MAC.

  1. Convert the percent of MAC to a decimal by dividing by 100.
  2. Multiply the decimal by the length of the MAC.
  3. Add this number to LEMAC.

What does MAC mean in aviation?

The average length of the chord is known as the mean aerodynamic chord ( MAC ). In large aircraft, centre of gravity limitations and the actual centre of gravity are often expressed in terms of percent MAC.

How is CG calculated in aircraft?

Center of gravity ( CG ) is calculated as follows:

  1. Determine the weights and arms of all mass within the aircraft.
  2. Multiply weights by arms for all mass to calculate moments.
  3. Add the moments of all mass together.
  4. Divide the total moment by the total mass of the aircraft to give an overall arm.
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What does lemac stand for?


Acronym Definition
LEMAC Leading Edge of the Mean Aerodynamic Chord

How do you find the root chord of a wing?

  1. R = root chord of the wing segment.
  2. e = sweep back of wing leading edge measured at the wing tip.
  3. f = sweep forward of wing trailing edge measured at the wing tip.
  4. Area of wing half = A = (S*R – (S*e)/2) – (S*f)/2.
  5. 1) On a plan of the wing, measure the values S, R, e, and F.

How do you calculate wing area?

A: In aerodynamics, the surface area of a wing is calculated by looking at the wing from a top-down view and measuring the area of the wing. This surface area is also known as the planform area. The planform area is an important value when calculating the performance of an airplane.

What is geometric mean chord?

If an airfoil surface of given span and area is replaced geometrically by an untapered parallel chord surface, with the same span and area, its chord is equal to the geometric mean chord. Also known as the standard mean chord.

What type of measurement is used to designate the arm in weight and balance computation?

35 Cards in this Set

When computing weight and balance, an airplane is considered to be in balance when The average moment arm of the loaded airplane falls within its CG range
What type of measurement is used to designate arm and weight and balance computation? Distance


What is the chord of an airfoil?

The straight line drawn from the leading to trailing edges of the airfoil is called the chord line. The chord line cuts the airfoil into an upper surface and a lower surface. If we plot the points that lie halfway between the upper and lower surfaces, we obtain a curve called the mean camber line.

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Where is the buttock line or Buttline of an aircraft?

Where is the buttock line or buttline of an aircraft? A width measurement left or right of, and parallel to, the vertical centerline.

How wingtip vortices are generated?

The vortices are caused by a pressure imbalance The vortices are created at the plane’s wingtips as the wings generate lift. The lower pressure air above the wing and the higher pressure air below seek to balance out, which causes the spiraling air flow.

What does aft CG mean?

The aft CG limit is the most rearward position at which the CG can be located for the most critical maneuver or operation. As the CG moves aft, a less stable condition occurs, which decreases the ability of the aircraft to right itself after maneuvering or turbulence.

What is center of gravity formula?

Center of Gravity Equation The center of gravity of an object is calculated by taking the sum of its moments divided by the overall weight of the object. The moment is the product of the weight and its location as measured from a set point called the origin.

What is the weight shift formula?

Weight Shift Instead of calculating a weight and moment for every section of the aircraft, it is only necessary to compute the original weight and moment—then, the effect of the change in weight. This is solved easily by cross-multiplying: 50 x 100 ÷ 8,600 =. 06 inches. Therefore, the CG shifts.

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