Aerodynamics Quiz Online

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Any object, moving through the air, suffers ...

c. inertial reactions.

b. friction and friction.

a. wear and loss of momentum.

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At higher speed, between an object and any fluid, the resistance ...

a. it grows.

c. does not vary.

b. decreases.

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What is the name of the graphic illustration of the relationship between horizontal and vertical speed in the entire spectrum of speeds of a paraglider?

a. Emagram.

b. The polar of the profile.

c. The polar of speed.

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A paraglider X has a fineness of 8, another paraglider Y has a fineness of 4. thisExposure allows the following conclusion ...

b. Y falls half as fast as X.

c. X travels twice the distance of Y.

a. Y falls twice as fast as X.

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5) A paraglider flies with a fineness of 6. If it travels a distance of 1200 meters, it has to calculate a loss of height of ...

b. 180 m.

c. 200 m.

a. 150 m.

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The term "load factor" means ...

a. Wing loading.

b. Constructive safety reserve in respect of the load of the paragliders

c. The load of the paragliders with the multiple of the total weight.

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In a regular and continuous turn, in addition to the total weight, another force caused by gravity acts on the glider. Isnamed...

a. Centripetal force.

c. Centrifugal force.

b. Driving force.

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8) A paraglider with a total load of 100 Kg is loaded in a 45º turn ...

c. Approximately 200 Kg.

a. Approximately 100 Kg.

b. Approximately 140 Kg.

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The pressure center is the point of application of ...

b. The resultant of forces of gravity.

a. The resultant of aerodynamic forces.

c. The balance between weight and resistance.

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The line that runs from the leading edge to the trailing edge along the top of a wing is called ...

c. Medium curvature.

a. Extrados.

b. Intradós.

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11) The “driving” force responsible for a glider gliding through the air is called:

b. Speed.

c. Weight.

a. Lift.

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The lift acts in the stabilized glide flight ...

a. Perpendiculartothe horizontal.

c. Perpendicular to the path.

b. Perpendicular to the total weight.

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The equidistant line between the soffit and the extrados, in a wing profile, is called

c. Rope.

a. Average curvatureline.

b. Thickness.

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Wing loading is the relationship between ...

b. The weight and the allowed load.

c. The apparent weight and the actual weight.

a. The surface of a wing and the weight, in flight, of the wing-pilot assembly.

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By increasing the angle of incidence of a wing in flight, the speed ...

b. Decreases.

c. It does not change, only the rate of fall.

a. Increases.

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16) A paraglider flying with its minimum wing loading ...

a. It is more resistant to turbulence and harder to ride, due to the lower weight.

c. Never fly with the minimum wing loading.

b. It has lower maximum and stall speeds.

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The concept of span means:

b. Variations of the angles of incidence in different parts of the wing.

c. The middle distance between leading edge and trailing edge.

a. The distance between the left and right wingtip.

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The concept of wing loading means ...

b. The weight supported per unit area.

c. Variations of the angles of incidence in different parts of the wing.

a. The average distance between the leading edge and the trailing edge.

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The wing loading of a paraglider is obtained as follows:

b. The maximum load divided by the actual area.

a. The load divided by the projected surface.

c. The total load divided by the actual area.

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20) The concept of the “elongation” of the wing, means the relationship between ...

c. The area and average depth of the wing in the square.

a. The surface and span, and is obtained by dividing the span squared divided by the surface (E2 / S)

b. The wingspan and average depth of the wing.

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Eddies at the lateral ends of the wing are generated by ...

c. The difference in pressure between the soffit and the extrados, which causes the transversal circulation from the area of greatest pressure (soffit), towards the zone of lower pressure (extrados), trying to equalize the pressures.

b. The current in the soffit that deflects towards the tips, in the extrados towards the center of the wing.

a. The boundary layer behind the tensile point becomes turbulent.

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) For a wing to generate lift, it has to deflect a certain volume of air with a certain speed toward the ground. For thisreasonisitcreated?

b. Frictionresistance.

a. Inducedresistance.

c. Parasiticresistance.

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If we lower the brakes excessively, the glider runs the risk of ...

a. Suffering from a frontal fold or collapse.

b. Suffer an increase in vertical speed with strong roll.

c. Suffer a detachment of the boundary layer and go into loss.

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The maximum distance from tip to tip of the wing is called:

c. Wingspan.

b. Wing shape.

a. Wing surface.

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The liftis:

a. It is a force perpendicular to the advance.

c. The force opposed to resistance.

b. The force exerted by the pilot to keep the wing up on takeoff.

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Pendulum stability is responsible for ...

c. Responsible for the inability to turn while riding with the front risers combined with the change in weight.

b. The tendency of a glider to regain straight and stable flight without the need for pilot intervention, in laminar wind conditions.

a. Nothing, it is only important in rigid airplanes and gliders but not in paragliders.

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The glide index of a glider gives information about the relationship between ...

b. The distance traveled and the unevenness lost.

a. Traction and total weight.

c. The wingspan and average depth of the wing.

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28) If the wing loading increases ...

c. Speed up and fineness doesn't change.

a. Increasefinesse and speed.

b. Decreasefinesse and speed.

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) The relative wind is ...

b. The turbulent wake left by the paraglider.

c. The air flow moving towards the profile, being opposite to the flight path.

a. The current of air that follows the glider on its way.

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The leading edge is ...

c. The lateral parts of the wing.

a. The front or front of a profile.

b. The back of a profile.

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The upper curvature that goes from the leading edge to the trailing edge in a wing is called ...

c. Medium curvature.

b. Intradós.

a. Extrados.

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32) The equidistant line between the soffit and the extrados, in a wing profile, is called:

c. Rope.

a. Average curvatureline.

b. Thickness.

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Increasing the angle of incidence of a wing exposed to air circulation causes the transition point on the extrados to move towards ...

b. Ahead

a. Behind.

c. It does not move.

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The concept of wing loading means ...

b. The average load per unit area.

c. Variations of the angles of incidence in different parts of the wing.

a. The average distance between the leading edge and the trailing edge.

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Eddies at the lateral ends of the wing are generated by ...

b. The current in the soffit that deflects towards the tips, in the extrados towards the center of the wing.

a. The boundary layer behind the tensile point becomes turbulent.

c. The difference in pressure between the intrados and the extrados, which causes the transversal circulation from the area of greatest pressure (intrados), towards thelower pressure (extrados), trying to equalize the pressures.

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The FRG ...

c. Everything is correct.

b. it is applied in the center of pressures and is aligned and on the vertical of the center of gravity.

a. is a forcevector.

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The concept of wing elongation means the relationship between ...

a. The thickness of the profile and the average depth of the wing.

c. The area and average depth of the wing in the square.

b. The wingspan and average depth of the wing.

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In which area near a flying glider are whirlwinds ...

b. Diagonally under the wing, behind the trailing edge.

a. On the wingtips, in front of the leading edge.

c. Diagonally above the wing, behind the trailing edge.

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What are the possible constructive means to reduce the pressure resistance in a paraglider?

b. In crease delongation.

c. The use of thicker profiles. possible with high C values.

a. The use of more aerodynamically suitable profiles.

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Increasing the resistance of the glider ...

b. Decreasetheglide angle.

a. It does not influence the glide angle.

c. Increase the glide angle.

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The projectedsurface ...

a. It is smaller than the real one.

b. It is smaller in the hang glider, in paragliding larger than the real surface.

c. It is bigger in hang gliding, in paraglider smaller than the actual surface.

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A movement about the longitudinal axis in a paraglider is called ...

b. Pitching.

c. Warp

a. Pendulous.

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A movement about the transverse axis in a paraglider is called ...

b. Pitching.

c. Swinging.

a. Turn.

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A movement about the vertical axis in a paraglider is called ...

c. Turn.

b. Swinging.

a. Pitching.

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A paraglider that continuously increases its speed in straight flight, without intervention of the pilot, has ...

b. Reverse flight performance.

c. Unstable flight performance.

a. Stable flight performance.

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The glide index of a glider gives information about the ratio of ...

b. Horizontal and verticalspeed.

a. Best glide speed and minimum sink rate flight speed.

c. The minimum speed and ground speed.

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A paraglider with fineness 8 flies from a height of 800 meters above the ground. What is the longest distance that it can travel in stable conditions?

c. 10.0 km

a. 24.0 Km.

b. 6.4 km

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If the glide angle increases the fineness ...

b. Decreases.

a. Increases.

c. It does not change

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In what area next to a flying paraglider are the “whirlwinds”?

c. Diagonally above the wing, behind the trailing edge.

a. On the wingtips, in front of the leading edge.

b. Diagonally under the wing, behind the trailing edge.

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The draft of a paragliding wing can vary regularly or permanently ...

b. by lengthening or shrinking the lines.

a. using the throttle and trimmers.

c. Everything is correct.

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The incidence of a paragliding wing is ...

a. the angle of the central chord and the horizon.

c. All arecorrect.

b. the angle of attack ± the angle of inclination or settlement.

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The draft of a paragliding wing can be ...

b. negative (below horizontal).

c. Both arecorrect.

a. positive (above horizontal).

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) The incidence of a free flight wing ...

a. usually varies, along the wingspan.

c. Everythingiscorrect.

b. it is greater in the wingtips, of a paraglider.

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The centering of a paragliding wing ...

c. Everything is correct.

a. in balanced flight, the center of gravity is vertical, from the center of pressures.

b. as the center of pressures migrate, the centering is adjusted, with a new incidence.

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Aerodynamic performance is known as ...

b. the maximum relationship between lift and drag.

c. Everything is correct.

a. the performance, discounting the influence of lines, pilot and seams.

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The maximum lift and resistance ratio of a paragliding wing is called ...

b. Exteriorfineness.

c. neither is correct.

a. Aerodynamic fineness and / or efficiency.

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57) The different types of resistance are ...

b. form, friction, induced, parasitic, interference.

a. pressure, friction, generated, parasitic, interference.

c. All are correct.

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Flying a paraglider with a maximum load, the detachment of the circulation is created ...

b. Regardless of the load, always with the same speed and the same angle of incidence.

a. With a higher speed than with a minimum load.

c. With a lower angle of incidence.

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The resistance of form, is related to ...

a. the frontal area, exposed to the flow.

c. Everything is correct.

b. the aerodynamics of the object and the trail of altered air.

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60) The friction resistance is related to ...

a. the viscosity of the fluid, the roughness of the object.

c. Everything is correct.

b. theboundarylayer.

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The resistance of a body, exposed to a current of air, is influenced, among other things, by ...

c. Its mass.

b. His weight.

a. Its way.

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The resistance of a body exposed to a current of air is significantly influenced by ...

a. Its molecular structure.

b. Its mass.

c. Its surface quality.

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Lift acts in stabilized glide flight ...

b. Perpendicular to the total weight.

c. Perpendicular to the path.

a. Perpendiculartothe horizontal.

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The relationship between lift and drag of a wing depends among other things ...

b. Of the density of the air.

c. Of the angle of incidence.

a. Of thewingsurface.

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The boundary layer in the profiles of the gliders is ...

c. Laminate throughout the depth of the wing.

b. Turbulent at the front of the wing, laminar at the rear.

a. Turbulent throughout most of the depth of the wing.

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Increasing the angle of incidence of a wing exposed to air circulation causes the transition point on the extrados to move towards ...

a. Behind.

c. It does not move.

b. Ahead.

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