Question

Two Factors that Cause Dissymmetry of Lift.

a) Air density and altitude.
b) Wing shape and airspeed.
c) Aircraft weight and fuel capacity.
d) Pilot skill and turbulence.

Answer 1

Dissymmetry of lift in aerodynamics is caused primarily by variations in air density and altitude as well as wing shape and airspeed. These factors affect the air pressure and flow patterns around the wing, which in turn influences lift according to Bernoulli's principle.

Step-by-step explanation:

Understanding Dissymmetry of Lift

The concept of dissymmetry of lift is important in the field of aerodynamics, especially related to aircraft design and operation. In aerodynamics, two major factors that cause dissymetry of lift are air density and altitude as well as wing shape and airspeed. Changes in air density, often due to altitude, affect the lift because the thinner the air, the less lift is created for a given speed. The shape of the wing and the speed at which the aircraft is traveling greatly influence the amount of lift generated as well due to changes in air pressure and flow patterns.

When discussing the lift of an aircraft wing, we often refer to Bernoulli's principle, which states that the faster air moves over a surface, the lower the pressure on that surface, thus creating a net upward force or lift. For example, during takeoff, if an aircraft travels at 60.0 m/s and the sea level density of air is 1.29 kg/m³, the airspeed over the upper surface of the wing must be different from the airspeed under the wing to generate the required lift, following Bernoulli's principle.

Answer 2

Dissymmetry of lift in rotary-wing aircraft is primarily caused by wing shape and airspeed. Bernoulli's principle and conservation of momentum are essential for generating lift, and adjustments in airspeed are necessary at higher altitudes to maintain lift due to decreased air density.

Step-by-step explanation:

The factors that cause dissymmetry of lift in rotary-wing aircraft, such as helicopters, are generally not related to air density, aircraft weight, fuel capacity, or pilot skill. Instead, the main factors are the wing shape and airspeed, particularly as they relate to the rotation of the blades in hover and forward flight. Dissymmetry of lift is the unequal lift distribution along the rotor disc. Bernoulli's principle and conservation of momentum are key to understanding how lift is produced. Changes in airspeed and wing shape can cause variations in lift that pilots must compensate for to maintain controlled flight. As an aircraft climbs to higher altitudes where the air density is lower, adjustments in airspeed, angle of attack, or wing design may be necessary to maintain adequate lift. For example, at cruising speed and reduced air density, air must move faster over the upper wing surface to create the ideal lift. This is due to Bernoulli's principle, where increased velocity leads to decreased pressure, resulting in lift. The exact required speed change depends on the specific aircraft and conditions.