Term
| On which wing planform does the stall begin at the wingtip and progress inward toward the wing root? |
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Definition
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Term
| Removing the rotor force on a gyroplane can lead to |
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Definition
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Term
| If the pilot applies right rudder to a stable airplane, the |
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Definition
| tail deflects left and the nose moves right. |
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Term
| Which action is necessary in order to perform a normal descent in an airship? |
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Definition
| Valve gas from the envelope. |
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Term
| If an increase in power tends to make the nose of an airplane rise, this is the result of the |
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Definition
| line of thrust being below the center of gravity. |
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Term
| The angle of attack of a wing directly controls the |
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Definition
| distribution of positive and negative pressure acting on the wing. |
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Term
| At a constant velocity in airflow, a high aspect ratio wing will have (in comparison with a low aspect ratio wing) |
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Definition
| decreased drag, especially at a high angle of attack. |
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Term
| Which subsonic planform provides the best lift coefficient? |
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Definition
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Term
| An airplane has a normal stalling speed of 60 knots but is forced into an accelerated stall at twice that speed. What maximum load factor will result from this maneuver? |
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Definition
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Term
| Which type of flap creates the least change in pitching moment? |
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Definition
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Term
| Rotor torque is a concern in gyroplanes only during |
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Definition
| prerotation or clutch engagement. |
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Term
| (Refer to Figure 20.) At an airspeed represented by point B, in steady flight, the pilot can expect to obtain the aircraft's |
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Definition
| maximum glide range in still air. |
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Term
| What is the relationship of false lift to the wind? False lift |
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Definition
| decreases as the wind accelerates a balloon to the same speed as the wind. |
|
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Term
| Longitudinal and lateral control of a gyroplane in flight are affected by |
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Definition
| tilting the plane of rotation of the rotor in the direction that control is desired. |
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Term
| Effective translational lift is that point during helicopter flight when |
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Definition
| additional lift is obtained from increased airflow through the rotor disc. |
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Term
| Action of the elevators moves the plane on its |
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Definition
|
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Term
| The lift differential that exists between advancing and retreating main rotor blades is known as |
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Definition
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Term
| If the same angle of attack is maintained in ground effect as when out of ground effect, lift will |
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Definition
| increase, and induced drag will decrease. |
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Term
| To prevent loss of air from ballonets when airspeed and engines are inadequate to maintain pressure, the |
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Definition
| pilot should close dampers. |
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Term
| As the angle of bank is increased, the vertical component of lift |
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Definition
| decreases and the sink rate increases. |
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Term
| (refer to figure 21) Consider only aspect ration (other factors remain constant). What aircraft will generate greatest lift? |
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Definition
|
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Term
| (Refer to figure 17) The airspeed indicated by point D is |
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Definition
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Term
| When an airship is at pressure height and superheat increases, constant pressure must be maintained by valving |
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Definition
|
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Term
| A line drawn from the leading edge to the trailing edge of an airfoil and equidistant at all points from the upper and lower contours is called the |
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Definition
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Term
| An airplane would have a tendency to nose up and have an inherent tendency to enter a stalled condition when the center of pressure is |
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Definition
| forward of the center of gravity. |
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Term
| Which statement is true regarding the forces acting on an airplane in a steady-state climb? |
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Definition
| The sum of all upward forces is equal to the sum of all downward forces. |
|
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Term
| In ballooning, when can false lift occur? |
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Definition
| During launches near obstacles. |
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Term
| During flight with zero angle of attack, the pressure along the upper surface of a wing would be |
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Definition
| less than atmospheric pressure. |
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Term
| When a slight upward or negative flap deflection is used, the result is |
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Definition
|
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Term
| (Refer to Figure 23.) Which is a fowler flap? |
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Definition
|
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Term
| During a steady climb, the rate of climb depends on |
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Definition
|
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Term
| Tying a severed suspension line |
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Definition
| will change the shape of the wing and is not permissible. |
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Term
| A wing with a very high aspect ratio (in comparison with a low aspect ratio wing) will have |
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Definition
|
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Term
| What is one indication of a serious envelope rip in an airship? |
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Definition
| Difficulty in controlling altitude. |
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Term
| If severe turbulence is encountered, the aircraft's airspeed should be reduced to |
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Definition
|
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Term
| (Refer to Figure 19.) The lift/drag at 2° angle of attack is approximately the same as the lift/drag for |
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Definition
|
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Term
| The crosstube is positioned by |
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Definition
| restraining cables attached to the rear of the keel. |
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Term
| When a helicopter experiences a translating tendency, it |
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Definition
| moves in the direction of tail rotor thrust. |
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Term
| The critical angle of attack at which a given aircraft stalls is dependent on the |
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Definition
|
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Term
| The capability of an aircraft to respond to a pilot's inputs, especially with regard to flightpath and attitude, is |
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Definition
|
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Term
| The maximum altitude an airship can reach under any given atmospheric condition and return safely to the surface is determined by |
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Definition
|
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Term
| What should be the first step in correcting pilot induced oscillation in a gyroplane? |
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Definition
|
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Term
| What causes lift which sometimes occurs during a balloon launch? |
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Definition
| Venturi effect of wind on the envelope. |
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Term
| Which statement describes the reationship of the forces acting on an aircraft in a constant-power and constant-airspeed descent? |
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Definition
| Thrust is equal to drag; lift is equal to weight. |
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Term
| A sweptwing airplane with weak static directional stability and increased dihedral causes an increase in |
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Definition
|
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Term
| (Refer to Figure 23.) Which is a slotted flap? |
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Definition
|
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Term
| The fan guard surrounds the propeller and |
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Definition
| protects the parachute suspension lines from damage. |
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Term
| An airship with a small fineness ration has a hull form that will introduce |
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Definition
| more frictional drag due to the plump shape of the hull. |
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Term
| Changes in the center of pressure of a wing affect the aircraft's |
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Definition
| aerodynamic balance and controllability. |
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Term
| Which statement is generally true regarding wing camber of a glider's airfoil? |
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Definition
| The camber is greater on the upper wing surface than it is on the lower surface of the wing. |
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