Aerodynamics Flashcards by A T

8359

What procedure is recommended for an engines-out approach and landing?

The flightpath and procedures should be almost identical to a normal approach and landing.

How well did you know this?

Not at all

Perfectly

8377
What will be the ratio between airspeed and lift if the angle of attack and other factors remain constant and airspeed is double? Lift will be

Four times greater.

How well did you know this?

Not at all

Perfectly

8390

At what Mach range does the subsonic flight range normally occur?

Below .75 Mach

How well did you know this?

Not at all

Perfectly

8326

Which of the following is considered a primary flight control?

Elevator.

How well did you know this?

Not at all

Perfectly

8345
What effect does an increase in airspeed have on a coordinated turn while maintaining a constant angle of bank and altitude?

The rate of turn will decrease resulting in no change in load factor.

How well did you know this?

Not at all

Perfectly

8394.2
A turbojet airplane has an increase in specific range with altitude, which can be attributed to three factors. One of those factors is

An increase in proportion of velocity versus thrust required.

How well did you know this?

Not at all

Perfectly

8341

Which is a purpose of wing-mounted vortex generators?

Delays the onset of drag divergence at high speeds and aids in maintaining aileron effectiveness at high speeds.

How well did you know this?

Not at all

Perfectly

8332

What is a purpose of flight spoilers?

Reduce lift without decreasing airspeed.

How well did you know this?

Not at all

Perfectly

8378

What true airspeed and angle of attack should be used to generate the same amount of lift as altitude is increased?

A higher true airspeed for any given angle of attack.

How well did you know this?

Not at all

Perfectly

8345.2

A bank angle of 15 degree will increase induced drag by about

How well did you know this?

Not at all

Perfectly

8328

What is the purpose of a control tab?

Move the flight controls in the event of manual reversion.

How well did you know this?

Not at all

Perfectly

8365
Identify the type stability if the aircraft attitude remains in the new position after the controls have been neutralized,

Neutral longitudinal static stability.

How well did you know this?

Not at all

Perfectly

8384

The primary purpose of high-lift devices is to increase the

Lift and reduce airspeed.

How well did you know this?

Not at all

Perfectly

8373
Identify the type stability if the aircraft attitude tends to return to its original position after the controls have been neutralized.

Positive static stability.

How well did you know this?

Not at all

Perfectly

8368

What is the reason for variations in geometric pitch along a propeller or rotor blade?

It permits a relatively constant angle of attack along its length when in cruising flight.

How well did you know this?

Not at all

Perfectly

8346
What is the effect on total drag of an aircraft if the airspeed decreases in level flight below that speed for maximum L/D?

Drag increases because of increased induced drag.

How well did you know this?

Not at all

Perfectly

9793.1

Aerodynamic braking is only effective up to approximately

60 to 70% of touchdown speed.

How well did you know this?

Not at all

Perfectly

8340

What is the purpose of an elevator trim tab?

Modify the downward tail load for various airspeeds in flight eliminating flight-control pressures.

How well did you know this?

Not at all

Perfectly

8324

When are inboard ailerons normally used?

Low-speed and high-speed flight.

How well did you know this?

Not at all

Perfectly

8351

How can the pilot increases the rate of turn and decrease the radius at the same time?

Steepen the bank and decrease airspeed.

How well did you know this?

Not at all

Perfectly

8333

For which purpose may flight spoilers be used?

Reduce the wings’lift upon landing.

How well did you know this?

Not at all

Perfectly

8339
Which direction from the primary control surface does an elevator adjustable trim tab move when the control surface is moved?

Remains fixed for all positions.

How well did you know this?

Not at all

Perfectly

8391

What is the principal advantage of a sweepback design wing over a straight wing design?

The critical Mach number will increase significantly.

How well did you know this?

Not at all

Perfectly

9793.2

Ground spoilers used after landing are

More effective at high speed.

How well did you know this?

Not at all

Perfectly

8330 | What is the purpose of a servo tab?

Reduce control forces by deflecting in the proper direction to move a primary flight control.

8348 | What affects indicated stall speed?

Weight, load factor, and power.

9740 | During a skidding turn to the right, what is the relationship between the component of lift and centrifugal force?

Centrifugal force is greater than the horizontal lift component.

8331 | Which is a purpose of leading-edge flaps?

Increase the camber of the wing.

9771 | When compared to plain flaps, flaps

Produce only slightly more lift, but much more drag.

8397 | What is the relationship between induced and parasite drag when the gross weight is increased?

Induced drag increases more than parasite drag.

8387 | Within what Mach range does transonic flight regimes usually occur?

.75 to 1.20 Mach

8362 | What effect, if any, does altitude have on V(MC) for an airplane with unsupercharged engines?

Decreases with altitude.

8337 | Which direction from the primary control surface does an anti-servo tab move?

Same direction.

8391.1 | Swept wings

Increases the critical Mach number.

8392 What is the result of a shock-induced separation of airflow occurring symmetrically near the wing root of a sweptwing aircraft?

A severe moment or ‘Mach tuck.’

8350 | Why must the angle of attack be increased during a turn to maintain altitude?

Compensate for loss of vertical component of lift.

8361 | Which engine is the ‘critical’ engine of a twin-engine airplane?

The one with the center of thrust closest to the centerline of the fuselage.

8338 | Which direction from the primary control surface does a servo tab move?

Opposite direction.

8389 | What is the free stream Mach number which produces first evidence of local sonic flow?

Critical Mach number.

9767 | How does Vs (KTAS) speed vary with altitude?

Varies directly with altitude.

8334 | Which is a purpose of leading -edge slats on high-performance wings?

Increase lift at relative slow speeds.

8375 | What flight condition should be expected when an aircraft leaves ground effect?

An increase in induced drag requiring a higher angle of attack.

8349 If no corrective action is taken by the pilot as angle of bank is increased, how is the vertical component of lift and sink rate affected?

Lift decreases and the sink rate increases.

8329 | What is the purpose of an anti-servo tab?

Prevent a control surface from moving to a full-deflection position due to aerodynamic forces.

9759 | If the boundary layer separates

The wing is about to stall and stop producing lift.

8352 What is the relationship of the rate of turn with the radius of turn with a constant angle of bank but increasing airspeed?

Rate will decrease and radius will increase.

8342 | Why do some airplanes equipped with inbound/outbound ailerons use the outboards for slow flight only?

Aerodynamic loads on the outboard ailerons tend to twist the wingtip at high speeds.

9823 | During a turn with constant power

The aircraft nose will pitch down.

8353 | Upon which factor does wing loading during a level coordinated turn in smooth air depend?

Angle of bank.

8347 | What is load factor?

Lift divided by the total weight.

8336 | Which is a purpose of ground spoilers?

Reduce the wings’ lift upon landing

8395 | What is the movement of the center of pressure when the wingtip of a sweptwing airplane are shock-stalled first?

Inward and forward.

8343 | Precise roll control using a rudder on a transport category airplane

Is difficult and therefore not recommended.

8363 | Under what condition should stalls never be practiced in a twin-engine airplane?

With one engine inoperative.

8379 | How can an airplane produce the same lift in ground effect as when out of ground effect?

A lower angle of attack.

8393 | What is one disadvantage of a sweptwing design?

The wingtip section stalls prior to the wing root.

8366 | What is a characteristic of longitudinal instability?

Pitch oscillations becoming progressively greater.

8372 Identify the type stability if the aircraft attitude tends to move farther from its original position after the controls have been neutralized.

Negative static stability

8325 | When are outboard ailerons normally used?

Low-speed flight only.

8356 | Airflow separation over the wing can be delayed by using vortex generators

Making the wing surface rough and/or directing high pressure air over the top of the wing or flap through slots.

8385 | What is the primary function of the leading edge flaps in landing configuration during the flare before touchdown?

Prevent flow separation.

8345.1 | Generally, the turning performance of an airplane is defined by

Aerodynamic and structural limits at low altitude.

9808 | The stall speed of an airplane

Is affected by weight, and bank angle.

9942 | How does the stall speed (KCAS) vary as you climb from sea level to 33,000 feet?

It remains relatively unchanged throughout the climb.

8388 | What is the highest speed possible without supersonic flow over the wing?

Critical Mach number.

8327 | Which of the following is considered an auxiliary flight control?

Leading-edge flaps.

9765 | What is a difference between the Fowler flap system and split flap system?

Fowler flaps produce the greatest change in pitching moment.

8376 | What characteristic should exist if an airplane is loaded to the rear of its CG range?

Unstable about the lateral axis.

8380 | What are some characteristics of an airplane loaded with the CG at the aft limit?

Lowest stall speed, highest cruise speed, and least stability.

9921 | An airplane loaded with the Center of Gravity aft of the rear CG limit could

make it more difficult to flare for landing.

8382 | By changing the angle of attack of a wing, the pilot can control the airplane’s

Lift, airspeed, and drag.

9803 | Swept wings causes a significant

reduction in effectiveness of flaps.

8386 | What effect does the leading edge slot in the wing have on performance?

Change the stalling angle of attack to a higher angle.

8367 | Describe dynamic longitudinal stability.

Motion about the the lateral axis.

8396 For a given angle of bank, the load factor imposed on both the aircraft and pilot in a coordinated constant-altitude turn

remains constant regardless of airspeed changes.

8354 If an aircraft with a gross weight of 2,000 pounds were subjected to a total load of 6,000 pounds in flight, the load factor would be

3 Gs.

8391.2 | For significant benefit, wing sweep must be at least

30 to 35 degrees.

9793 | Upon landing, spoilers

function by increasing tire to ground friction.

8399 | At which speed will increasing the pitch attitude cause an airplane to climb?

High speed.

9766 | On which type of wing are flaps most effective?

Thick wing.